Wednesday, April 16, 2008

COUGH


Ordinary dry cough with throat pain - aris­ing from pharyngitis, laryngitis and bron­chitis is one of the commonest symptom seen in General Practice.
Instructions :
1. Steam inhalations 2-3 times/day. Addto water Tine. Benzoin, Vicks orAmrutanjan.
2. Warm salt water Gargles.
3. Take hot drinks like hot tea, coffee,milk or soups,5-6 times/day.
4. If cough is severe, advise Rest at home,and voice rest if laryngitis.
5. If smoker, advise to stop smoking
6. Instruct to cover the mouth whilecoughing (using hand or handkerchief)to prevent spread of infection to otherfamily members.


Drug Treatment :
1. Cap Terramycin 500 mg. tds x 5 (anti­biotic = 7A) Read the note below.
2. Suprcssa 1-2 tsp tds or Linctus Co­deine I tsp tds3.


If associated with fever, Add :
Tab Crocin 1 tds and if fever


4. If associated with common colds,Add anti histaminic :
Tab Rinoslat Vi - 1 tds


5. If associated with Body ache, AddNSAID :
Tab Disprin 1 tds, or Tab Combiflam 1 tds
If associated with occasional rhonchii, Add Bronchodilator :
i) Tab Asthalin 4 mg. x tds ii) Tab Wysolon 5 mg. tds x 3


If associated with expectoration,
Give :
i) Avil expectorant tsp tds ii) Tab Bromhexeine 8 mg. tds
There major points in deciding treat­ment of cough are its duration, pres­ence of expectoration and presence of wheezing.
The Choice of the antibiotic will vary from doctor to doctor, and from locality to locality.
In General, for mild infections use milder antibiotics like Tetracyclins, Septran, Erythromycin, Ampicillin-Amoxycillin, Gentamycin.
If the infection is severe start with peni­cillin, Roxithromycin, Cefalosporins or Pefloxacin.
If infection is not controlled in 3 days,
1. Cap. Nufex 500 mg. or Inj. Penicillin 10 lacs IM x A.T.D. x OD 6 (penicillin is one of the most effective drugs in Respiratory tract in­fections)


2. Tab Wysolone 5 mg. tds x 5 (Predniso­lone =9A-1)
3. Auscultate carefully for wheezing &rhonchii.
4. If no response, ask for investigations :i) Hb%, WBC for eosinophil. ii) X-ray Chest for TB, pneumonia etc. iii) If other investigations are normal, HIV Test.
5. If Eosinophilia, i.e. Tropical Eosino-philia.
1. T. Hetrazan 1 tds x 21 days


2. T. Wysolone 1 bd x 10-15 days


Indications for immediate X-ray ;
1. Cough > 15 days.
2. Chest pain on breathing, high feveror dyspnoea
3. Rales, cavity or abnormal breathsounds
4. Loss of weight or gross emaciation
5. Hemoptysis
6. No response to antibiotics for 1 wk.

Parikartika


The references regarding parikartika are found in sushruta samhita in nidana sthana, chikitsa sthana, and uttaratantra.
In charaka samhita reference regarding parikartika are seen in the siddhi sthana.
In Astanga sangraha parikartika is seen in sutra sthana and nidana sthana.
In bhela samhita parikartika word is seen in the siddhi sthana.
In laghu trayees reference about the parikartika is not seen.
Acharya Kashyapa has mentioned about parikartika in Chikitsa Sthana.
“Parikartika” is not being described in Vedas even tough Vedas have a rich description of various diseases and their management.
All the three authors of Bhrihatrayee have dealt about it.
Nirukti
Pari = Sarvato Bhaavaha.
Kartika = sharp shooting pain (especially in rectum).
Parikrit = Krintati = to cut off, cut round, clip.
Kartana = to cut off.
Vyakhya
“Parisarvato bhavena krintateeva chhinateeva bastyadeeni iti parikartika”.
According to Monier Williams Sanskrit – English dictionary, the words carry the meaning as
Krintati = to cut off, cut round, clip.
Chinna = Chedanam6, again is to cut off, cut, divide.
Parikartika is a condition where the person experiences excruciating pain, which is,cutting type in the guda, Basti Pradesha and surrounding areas.

NIDANA
In Ayurvedic literature parikartika word is seen in virechana vyapat contexts, avruta vata contexts, vataja atisara contexts ect so it is a basically symptom rather a disease, which is a very pain full condition, all the causes which are responsible for virechana vyapat, avruta vata, vataja atisara ect are all the causes for the parikartika. All the available matter is collected here and divided in concise form.
Ahara viharaj –
Sushruta while explaining vamana virechana vyapat he tells that a debilitated person with Mridu Koshta or Mandagni, who intakes the Ati-Rooksha, Ati-Teekshna, Ati-Ushna, Ati-Lavana Ahara or ingestion of Virechana Oushadhi causes the Dooshana of Pitta Dosha and Vata Dosha and leads to Parikartika.
He also mentioned that Parikartika is a Vyapath of Virechana while Kantha Kshanana is a Vyapath of Vamana.
According to Charaka, if a strong Virechana Oushadhi is given in a Snigdha Kaya, Guru Koshta, in Saamavata, in Krusha or in Mridu Koshta and in worn out weak individual, it can cause extensive painful condition, Parikartika.
Vyadhi Nimittaja –
Condition that which is produced after a disease or during the diseased stage, that is vyadhi nimittaja. And Charaka has described Parikartika in Atisara Vyapath chapter, where he mentions clinical features of Vataj Atisara. According to him there is scanty hard stools, with froth and along with sounds, with gripping and cutting type of pain in Guda, and prolapse may follow later even.
Again in case of Jwara where there is generalized Rookshata of the body, even a small amount of Rooksha Pureesha, which passes, may be enough to result into a Parikartika.
Vaidhya Nimittaja :
The procedure which is produced by an inexperienced Vaidhya can also leads to condition parikartika. Sushruta has described 15 different kinds of complications, which may result from an injudicious use of Basti and Virechana owing to the ignorance of the Vaidhya. Parikatika is one such disorder. Parikartika is such a condition, which is produced by improper conduction of a therapy. According to Sushruta, it develop after incorrect administration of Basti using a rough and thick Basti Netra.17 This is true as it invariably produces a tear in the anal margin due to local damage.
Even Acharya Charaka, 18,19,20 Vagbhata 21 and Sharangadhara are also having the same opinion.
OTHER CONDITION
In Ayurvedic literatures Parikartana and Parikartika are the two terms used interchangeably as in , they have been used on numerous occasions as symptoms of various diseases. So it appears that they have been used for the same meaning. Parikartika is seen in the following contexts.
· Apana avruta udana. A.H.Ni - 16/52.
· Vyana avruta apana. Ch.Chi – 28/211.
· Heena dosha apahrita vyapath. Su.Chi - 38/4.
· Pureesha avruta vata. Ch.Chi - 28/70.
· Pureesha avruta vata. ; A.H.Ni - 16/40.
· Sahaja Arshas. Ch.chi - 14/8.
· Sahaja Arshas. A.S.Ni - 7/9.
· Pureesha nigraha. A.S.Su - 5/4.
· Pureesha nigraha. ; A.H.Su - 4/3.
· Pureesha nigraha. ; Ma.Ni - 27/3.
· Vatika grahani. Ch.Chi – 28/221.
· Vatika atisara. Ch.Chi - 19/5.
· Vatika atisara. A.S.ni - 8/8.
· Vatika atisara. A.H.ni - 8/7.
· Udavarta.Ch.Chi.19/5;A.H.ni.7/48.
· Udavarta. A.H.ni.7/48.

CHIKITSA

Sushruta is the one author has given a much description and strong consideration to Parikartika than any other authors, who have mentioned the Chikitsa for this in a brief manner. It is true that none of them have described any surgical intervention thereby showing that there was no need of surgery as the disease was completely cured by the conservative method itself and were much satisfied with the management.
According to the use of medicines the management was divided into general management and local management.

General management :

The oral preparation has many fold objectives like some drugs are used for the correction of Annavaha Srotas, while some for Deepana - Pachana etc. the Shamana of Tridosha is also mentioned.
Sushruta has advised Parisheka of cold water and drinking milk as oral administration.22
Even Charaka for the same has mentioned drinking of milk and intake of Amla Dravya.23
Both these treatments have the property of Vata Shamana and they improve digestion, which in turn mitigates both pain and constipation. He says if Parikartika is present along with fever, one has to take Yavagu prepared of Bala, Kokum etc. Hence in this context the treatment is more focused towards alleviating Vata Dosha and Pitta Dosha and to correct the altered Agni.

Local management :

This is basically attributed to the Basti Karma. Most of the drugs, which are used in the Basti Karrma, are Vata-Pitta Dosha Shamaka and Vrana Ropaka.
There are mainly two types of Basti.
Asthapana.
Anuvasana.
The Basti, which consists of excessive of Sneha Dravya, is called as Anuvasana Basti. It is so called for the fact that it doesn’t injure the system even in the event of it being retained in the body for a whole day or for the fact that it can be adapted to daily application.
Sushruta mentions that in Sneha Basti, the dose is ¼ to that of Niruha Basti, which is decided according to the age.
Dalhana while commenting upon the above verse mentions that Uttama Matra of Sneha Basti is of 6 Pala, Madhyama Matra is of 3 Pala and Kaneeyasi Matra is of 1 ½ Pala.25
Chakrapanidutta on commenting upon Matra Basti describes that the Sneha used in Sneha Basti is 6 Pala that in Anuvasana is 3 Pala and that in Matra Basti is 1 ½ Pala of Sneha.26
It is obvious from the above reference that Acharyas have sub-classified Snaihika Basti into 3 types depending upon the dosage.

Charaka advises that the dose of Hrisiyasi Sneha Pana should be the Sneha Matra in Matra Basti.

Sushruta mentions that Matra Basti is applicable in all cases and is an alternative to Anuvasana Basti, but should be administered with oil only a half part of Sneha of that used in Anuvasana. 28
According to Dalhana, Madhuyasti Siddha Ghrita is indicated in Pittolbana Parikartika while Madhuyasti Siddha Taila is indicated in Vatolbana Parikartika.
MODERN REVIEW

Anal fissure is the second most common condition seen in a rectal clinic and is by far the most common cause of anal ulceration, about 90% of anal fissure occur in the posterior midline the remaining 10% are found in the anterior midline, it is being considerably for its cause, pathology, clinical features, and management, males are more prone to this than females
Anatomy of the Anal Canal 30
The short or anatomical anal canal (2 cm) extends from the anal valves to the anal verge, and the surgical or long anal canal (4 cm) extends from the anorectal ring to the verge. The surgical anorectal junction seems to be more physiological. In the upper part of the anal canal, the mucosa is thrown into a series of lon­gitudinal folds called the columns of Morgagni (10-12 in number). Distally these columns are joined by the anal valves of Ball. The anal glands arise from the dentate line and open into the apex of the crypts of Morgagni. The dentate line is an important guide in the anatomy of the anal canal. The mucosa above this line is made of a cubical epithelium and is entodermal in origin, while the mucosa below is squamous in nature and ectodermal. The area above the dentate line is sup­plied by autonomic nerves and drains into the portal venous system; the area below is supplied by the sensi­tive spinal nerves and drains into the systemic veins.
However, the attachment of the anal membrane undergoes differential rapid growth and enlarges to become in the adult the whole of 15 mm or so — the anal transitional zone (ATZ). This whole ATZ repre­sents the ectoderm-entoderm boundary. From about 10-15 mm above the valves down to the boundary with hairy skin, the epithelium has a rich sensory supply made up of both free and organised nerve endings. The sensory endings in the hairy perianal skin are similar to the hairy skin elsewhere in the body.
Sphincters
The anal canal is surrounded by two sphincters, voluntary and involuntary, which have co­ordinated action. The external sphincter (voluntary) has three parts—subcutaneous, superficial, and deep but functionally, it works as a single unit. It has also been regarded as a series of three loops. The top loop is made up of the deep part of the external anal sphincter and puborectalis attached to the pubis, the middle one is the superficial sphincter attached to the coccyx, and the base loop is attached to the perineal body.
The internal sphincter (involuntary) is the condensation of the circular muscle coat of the rectum. It is 2.5 cm long and 2-5 mm thick, commencing where the rectum passes through the pelvic diaphragm and ending at the anal orifice.
Arterial supply
The superior rectal artery, continuation of the inferior mesenteric artery, descends posteri­orly to the rectum where it bifurcates to supply the rectum and the upper part of the anal canal. The right branch again divides into anterior and posterior branches. The final termination of the superior rectal artery corresponds to 3, 7, and 11 o'clock positions in lithotomy; these correspond to the positions of primary internal piles. The middle rectal arteries arise from the anterior division of the internal iliac artery on each side and enter the lower portion of the rectum inferoposteriorly at the level of the levator ani muscles. The infe­rior rectal arteries on each side arise from the internal pudendal arteries and traverse the ischiorectal fossae on each side to supply the anal sphincter muscle. These three vessels anastomose freely in the anatomical tran­sitional zone. The median sacral artery, a branch from the aorta, supplies only a very small part of the poste­rior wall of the lower rectum.
Venous drainage
There are two systems of veins — portal and systemic. The superior rectal vein drains the rectum and upper part of the anal canal into the portal system via the inferior mesenteric vein. The middle rectal veins drain the lower part of the rectum and upper part of the anal canal to the internal iliac vein. The inferior rectal veins drain the lower anal canal to the internal pudendal veins.
Lymphatic drainage
There are free communica­tions between the submucosal and intramuscular lym­phatic vessels. The usual drainage flow is upwards and to a limited extent, laterally and downwards. The superior rectal nodes are an important group of nodes situ­ated on the back of the rectal ampulla above the levator ani muscle; they are also known as pararectal lymph nodes of Gerota. The middle rectal nodes lie close to middle rectal arteries and pass to the lymph nodes around the internal iliac arteries. The upper part of the anal canal may drain into the superior, middle, or infe­rior rectal lymph nodes. However, the part of the anal canal below the dentate line drains into the inguinal lymph nodes. The presacral lymph nodes lie in the hollow of the sacrum along the median sacral vessels; these are involved in growth of the posterior wall of the rectum and are palpable rectally when enlarged.
Nerve supply
The sympathetic nerve supply to the rectum comes from the hypogastric plexus. The parasympathetic supply comes from the 2nd, 3rd, and 4th sacral nerves (pelvis splanchnic).
The presacral nerve and pelvic plexus come very close in the dissection of the pelvis during excision of the rectum and they need careful protection. The internal .sphincter, apparently responsible for about 85 per cent of the resting anal canal pressure, has dual (sym­pathetic and parasympathetic) excitatory control. The motor fibres to the external anal sphincter travel in the inferior rectal nerve (S2 and S;3) and the perineal branch of S4.
PHYSIOLOGY
The colon has three main types of movements—segmental, propulsion, and retropulsion—which help in absorption and faecal movement. Out of approximately 1.5-2 liters of fluids taken orally per day, the colon absorbs water and electrolytes leaving only 100 ml of fluid to pass into the faeces. The proximal (ascending) colon is called the absorptive colon and the distal (descending) one is called the storage colon. The latter secretes copious amounts of mucus rich in potas­sium. The colonic muscle tone is maintained by prosta­glandin.
The rectum is not only a simple- tube for the passage of faeces. In addition to being a reservoir of flatus and faeces, it plays an important role in the maintenance of continence. The rectum also absorbs water and sodium and secretes mucous, rich in potassium and bicarbon­ate. The rectal ampulla normally remains empty and the contraction of the puborectalis maintains the anorectal angle at 80-90 degrees. When the intra­abdominal pressure rises and the puborectalis is functioning, the anterior wall of the rectum is forced against the upper anal (anal like a flap valve) —-the most important mechanism in the maintenance of faecal continence. A flutter valve mechanism also works where flattening of the two walls in the pelvic slit occurs due to raised intra-abdominal pressure.

The mass movement forces colonic contents into the upper rectum. Here, the distension caused by the faeces leads to non-propulsive segmental movements and retropulsion and propulsion also occur. Further passage of the contents into the ampulla distends this part of the: rectum; this stimulates the extra rectal stretch receptor to give rise to the sensation of perineal fullness associated with a feeling of impending evacua­tion—the rectal sensation. This rise in the abdominal pressure is transient; after about a minute or so, due to receptive relaxation of the ampulla, the pressure returns to the pre-distension level. During the phase of increased ampullary pressure, the rectosphincteric reflex is activated resulting in relaxation of the internal sphincter and sampling of the rectal contents by the anal canal mucosa. At this time, voluntary contraction of the external sphincter prevents further sampling. With the accommodative relaxation of the ampulla, the rectosphincteric reflex is suppressed, the internal sphincter contracts, the sampling stops, and the desire to defecate is overcome. Further entry of colonic con­tents into the ampulla leads to renewal of the same process until the person defecates voluntarily or until the ampulla contains 150-200 ml of material. In the latter case, the internal sphincter relaxes and contrac­tion of the external sphincter is overcome to make the patient incontinent. In the squatting position, the anorectal angle is decreased on straining. However, most of the straightening is due to voluntary relaxation of the puborectalis, the external anal sphincter complex, in response to straining. Now as the person strains, the intra-ampullary pressure is raised; this relaxes the internal sphincter via activation of the rectosphincteric reflex. Due to a prolonged increase in intrarectal pressure, the external sphincter relaxes.
The faecal bolus or the flatus thus raises the anterior rectal wall of the upper anal canal and passes into the relaxed anal canal to be evacuated subsequently. The presence of any matter in the rectal ampulla, be it faeces, flatus, mucous, or growth will lead to a desire to evacuate until the matter is expelled. In ampullary growth, the expulsion is not possible and the patient suffers from tenesmus and a sense of incomplete evacuation. The extensive involvement of the internal sphincter by a low rectal growth and infiltration of the pelvic splanchnic nerves will lead to incontinence. The central mechanism in the nervous system controlling the act of defecation is not understood. Recent experiments suggest that there is a fast-conducting, direct, pyramidal pathway to the sacral anterior horn cells supplying the pelvic floor and external sphincter, illustrating the importance of brain in the normal functioning of these muscles.
FISSURE-IN-ANO

Definition – an elongated ulcer in the long axis of the lower anal canal.
Location – the site of election for an anal fissure is the midline posteriorly (90% overall). The next most frequent situation is the midline anteriorly.

Aetiology -
The cause of anal fissure and particularly the reason why the midline posteriorly is so frequently affected, is not completely understood.
A probable explanation is as follows -
· The posterior wall of the rectum curves forwards from the hollow of the sacrum to join the anal canal, which then turns sharply backwards. During defecation the pressure of a hard fecal mass is mainly on the posterior anal tissues, in which event the overlying epithelium is greatly stretched and, being relatively unsupported by muscle, is placed in a vulnerable position when a scybalous mass is being expelled.
· Possibly some cases are due to tearing down of an anal valve of Ball.
An anterior fissure is much more common in women, particularly in those who have borne children. This can be explained by the lack of support of anal mucous membrane by a damaged pelvic floor and attenuated perineal body.
Some causes of anal fissure are certain - an incorrectly performed operation for hemorrhoids in which too much skin is removed. This results in anal stenosis and tearing of scar when a hard motion is passed.
Inflammatory bowel disease – colitis or Crohn’s disease.
Sexually transmitted diseases.

Pathology –
An anal fissure is either acute or chronic. The upper internal end of the fissure stops at the dentate line. The swollen anal valve at the upper end of the fissure is called ‘hypertrophied anal papilla’. Because the fissure occurs in the stratified sensitive epithelium of the lower half of the anal canal, pain is the most prominent symptom.
Acute anal fissure Acute anal fissure is a deep tear through the skin of the anal margin extending into the anal canal. There is little inflammatory indurations or edema of its edges. There is accompanying spasm of the anal sphincter muscle


Chronic anal fissure is characterized by inflamed indurated margins, and a base consisting of either scar tissue or the lower border of the internal sphincter muscle. The ulcer is canoe shaped, and at the inferior extremity frequently there is a tag of skin, usually edematous. This tag is known picturesquely as a sentinel pile – ‘sentinel’ because it guards the fissure. There may be spasm of the involuntary musculature of the internal sphincter. In long standing cases, this muscle becomes organically contracted by infiltration of fibrous tissue. Infection is common and may be severe ending in abscess formation. A cutaneous fistula may follow.Chronic fissure in ano may have a specific cause – often a granulomatous infection, e.g. Crohn’s disease of syphilis. Biopsy examination is advisable of any tissue removed at operation for a chronic fissure. Specific fissures of this type are often less painful than the appearance of the lesion would suggest.


Clinical features –
The condition is more common in women, and generally occurs during the meridian of life. It is uncommon in the aged, because of muscular atony. Anal fissure is not rare in children, is sometimes encountered during infancy and may cause acquired mega colon. Pain is the symptom – sharp, agonizing pain starting during defecation, often overwhelming in intensity and lasting an hour or more. As a rule, it ceases suddenly, and the sufferer is comfortable until the next action of bowel. Periods of remission occur for days or weeks. The patient tends to become constipated rather than go through the agony of defecation.
Bleeding – this is usually slight and consists of bright streaks on the stools or on the paper. Discharge – a slight discharge accompanies fully established cases. The discharge may cause pruritus.


On examination –
In cases of some standing, a sentinel skin tag can usually be displayed. This together with a typical history and a tightly closed puckered anus is almost pathognomonic of the condition. By gently parting the margins of the anus, the lower end of the fissure can be seen.
Because of the intense pain, digital examination of the anal canal should not be attempted, unless the fissure cannot be seen, or it seems imperative to exclude major intrarectal pathology. In these circumstances, the local application of a surface anesthetic such as 5% xylocaine on cotton wool, left in place for about 5 minutes, will enable the necessary examination to be made. In early cases the edges of the fissure are impalpable, in fully established cases, a characteristic crater, which feels like a vertical buttonhole, can be palpated. The diagnosis must be established beyond doubt, for which a general anesthetic may be required.


Differential diagnosis -
Carcinoma of the anus in its very early stages easily simulates a fissure. If a real doubt exists, the lesion must be excised under general anesthesia and submitted to histological examination.
Multiple fissures in the perianal skin are commonly seen as a complication of skin diseases, scratching and inflammatory bowel disease. Also homosexual practices and anorectal sexually transmitted disease can cause multiple fissures in both sexes.
Anal chancre is becoming more common and may present as a painful rather than a painless ulcer. The serous discharge contains spirochetes. All patients with sexually transmitted disease, and admitted homosexuals, should be tested for a positive serological response to HIV as they may have ADIS.
Tuberculous ulcer has an undermined edge. Proctalgia fugax is characterized by attacks of severe pain arising in the rectum, recurring at irregular intervals and apparently unrelated to organic disease. The pain is described as cramp-like often occurs when the patient is in bed at night, usually lasts only a few minutes, and disappears spontaneously.


MANAGEMENT OF FISSURE IN ANO

Basic principle –
The pain of an anal fissure is so great that usually the patient demands relief, and consequently many patients with an acute fissure present early. The object of all treatment for this condition is to obtain complete relaxation on the internal sphincter. Provided the complications are dealt with, the fissure will slowly heal as soon as all spasm has disappeared.

Conservative treatment –
Simple conservative measures will give relief in cases where the fissure is acute and superficial and where the inflammation is minimal.
1. Conservative dilatation – 5% Xylocaine in a water-soluble lubricant is introduced with a fine nozzle into the anal canal. After waiting a few minutes for the surface anesthetic to act, relaxation may be sufficient to permit the passage of a well-lubricated finger into the canal. Next a small anal dilator may be passed and, if the anesthesia is adequate, the largest dilator may be introduced. The patient is supplied with Xylocaine lubricant and instructed to pass a dilator twice a day for a month, by which time the fissure is usually healed. Laxatives are prescribed to ensure that the motion is soft, but the stools should not be made watery.


2. Injection therapy – a superficial fissure of recent origin can often be rapidly and effectively healed by the injection of an oil soluble local anesthetic. The injection is made both into the superficial tissues subjacent to the fissure thus giving relief from pain, and deeply into the external sphincter so as to allay spasm. Complete anesthesia with the abolition of spasm is produced within a few minutes and should last for 14 – 21 days. By this time the fissure may be found to have healed or further injections may be given. Technique – several preparations are available containing procaine in oily solution to prolong the action of the anesthetic. The viscous solution is warmed by placing the ampoule in hot water, and is drawn up into a 10ml syringe. It is necessary to use a fairly large bore needle. The patient is placed in the right lateral position. A small quantity of 1-2% aqueous solution of procaine is used to raise as intradermal wheal in mid-line posteriorly, 2.5 cm from the anus. The left index finger is inserted into the rectum, and the anal canal is drawn downwards by flexion of the terminal joint. The needle is introduced into the anesthetized area of the skin and is directed deeply into the sphincteric muscle on one or the other side, the finger within the canal serving as a guide to the position of the needle point, and the solution is injected fanwise as far forward as the anterior edge of the anus. The opposite side of the canal is then infiltrated in a similar manner, without withdrawing the needle from original skin puncture, and finally an injection is made into the superficial tissue immediately deep to the fissure. In all, 10-20ml of solution is injected.


Operative measures –
1. Lord’s anal dilatation – this is the simplest procedure, involving a wide forcible dilatation of the sphincter. Under general anesthesia, the index and the middle fingers of each hand are inserted simultaneously into the anus and pulled apart to give maximal dilatation. The patient can go home the same day, but should be warned that there may be some fecal incontinence lasting possibly for a week or 10 days.
Surgical measures are advisable in cases -
· If earlier measures are ineffective.
· If the fissure is chronic with fibrosis.
· Presence of a skin tag or mucous polypus.
General anesthesia is best, though some surgeons use Xylocaine or Lignocaine introduced into the ischiorectal fossa on each side, in order to anesthetise the nerves passing to the rectum. A caudal block is also suitable.
2. Lateral anal sphincterotomy – in this operation the internal sphincter is divided away from the fissure itself – usually either in the right or in the left lateral positions. The procedure can be done by an open or a closed method. Healing is usually complete within 3 weeks. This is done after the anal canal has been stretched and everted. A bivalve speculum is introduced into the anal canal, and is gradually opened to expose the fissure and put the fibers of the internal sphincter under stretch. These fibers are completely divided to just above the dentate line, to expose the smooth conjoined longitudinal muscle lying underneath. The wound is prolonged in the same direction to excise a tag, if present.


This operation is more successful for acute than chronic fissures. 75% of the cases are suitable for this operation. The patient can leave the hospital within 3 to 4 days; the procedure can be done as an outpatient under local anesthesia by an experienced surgeon.

3. Dorsal fissurectomy and sphincterotomy – the essential part of the operation is to divide the transverse fibers of the internal sphincter in the floor of the fissure. If a sentinel pile is present, it is excised. The ends of the divided muscles retract and a smooth wound is left. The after treatment consists of attention to bowels, a daily bath, and the passage of an anal dilator until the wounds have healed; which usually takes about 3 weeks. Despite the presence of the wound, there is little or no pain and the results are good.
The disadvantage of this operation is the prolonged healing time – usually not less than 3 weeks and often more and, occasionally, a mild persistent and permanent mucous discharge. It is now reserved only for the most chronic or recurrent anal fissure, the majority being treated by lateral sphincterotomy.
4. Excision – when the fissure is a chronic one, or shows much induration, it is probable that complete excision is the operative choice. After the sphincter has been stretched, two pairs of light tissue forceps are placed on the muco-cuteneous junction well to each side of the fissure, and are drawn downwards until the entire fissure comes into view. With a sharp knife the fissure is clearly excised by an elliptical incision, which is deepened down to the fibers of the internal sphincter. To ensure free drainage the ellipse, which includes the sentinel pile, should be carried out well on to the perianal skin, where it should be at least 2 cm in breadth. The sphincteric fibers immediately deep to the fissure may be divided at the same time. Thereafter the floor of the wound should be completely smooth and free from ridges and hollows.After treatment – after either sphinctertomy or excision, bleeding is arrested by the application of a gauge swab, a corner of which may be tucked into the anal canal. It is covered with wool and secured with a T-bandage. The dressings are changed daily, but subsequent repacking of wound should not be required. Hot sitz baths are instituted as early as possible, and gentle cleaning with soap and water is carried after each evacuation. There is almost complete relief of pain immediately after the operation, and healing may be expected to be complete in from 10 days to 3 weeks. The bowel motions should be kept soft for several months after operation, since, if constipation is allowed to exist, there is considerable risk that fissure may recur.

Malaria

found in warm low, marshy countries the world over, is caused by protozoan parasites of the family Plasmodiidae which are carried by female anopheline mosquitoes.
There are four species of human malaria: Plasmodium vivax, causing vivax (benign tertian) malaria, Plasmodium malariae, causing quar­tan malaria, Plasmodium falciparum, causing falci­parum (estivo-autumnal) malaria, and Plasmodium ovale, causing a mild tertian malaria. Plasmodium vivax and Plasmodium falciparum have the highest incidence, but contrasting characteristics. Vivax malaria has a 48-hour cycle, is chronic, and tends to relapse in milder forms. Falciparum malaria is often acute and fatal. Diagnosis is made when malarial parasites are found in the blood.The life cycle of the parasite has two aspects, the sexual cycle found in the mosquito and the asexual cycle found in man. The sexual cycle (sporogony), lasting 8 to 10 days in tertian and 10 to 12 in falci­parum malaria, begins when an anopheline mosquito biles a carrier of malaria. The mosquito ingests sexual forms which mi­grate to the stomach where they mature and are fertilized. The resulting zygote burrows into the submucosa of the stomach and becomes encysted (oocyst) and sporulates. The oocyst ruptures releasing sporozoites which migrate through the tissues of the mosquito; especially to the salivary glands. The asexual or human cycle (schiz­ogony) begins when (the infected mosquito bites man and the sporozoites are injected into the blood. After an exoerythrocytic period of about ten days, new forms appear and enter the red blood cells; Plasmodium vivax comes to fill the greater part (up to one third) while Plasmodium falciparum occupies about one-fifth of the cell. Within the next 48 hours in Plasmodium vivax the nucleus divides into numerous small merozoites. The erythro­cytes rupture and these merozoites are re­leased into the blood to enter new cells. Sporulation takes place in Plasmodium falciparum irregularly every 36 to 48 hours. The chill or paroxysms occur at this point, once the cycle has become fully established. Just before, during, or shortly after onset of the paroxysm accompanied by chills and high fever, the parasites will be found in blood smears. After several asexual generations, gametocytes (sexual forms) appear.
The injurious effects of malaria result from the destruction of erythrocytes giving rise to hemolytic anemia and also from the liberation of toxic material and pigment and the thrombotic occlusion of arterioles and capillaries. The spleen early in the disease is enlarged, soft and congested, with parasitized red cells. It may rupture during the acute phase. Later the spleen is smaller, firm, slate-gray and contains pigment granules in macrophages. The malarial pigment (hematin) is derived from the hemoglobin of the parasitized red blood cell.The liver goes through changes similar to those in the spleen. There is first engorgement of the hepatic sinusoids with parasitized erythrocytes. Later there is proliferation and enlargement of the Kupffer cells which phagocytize large amounts of pigment. The bone marrow shows deposition of pigment and parasites, an increase of macrophages and erythroblastic hyperplasia.
Changes in the brain are found in falciparum malaria. The cerebral capillaries are dilated and filled with parasitized red cells. Injured capillaries are surrounded by a ring of hemorrhage with an intervening rim of undamaged brain tissue. The capillary in jury is thrombotic, not embolic. Later, the brain tissue surrounding the injured capil­lary undergoes necrosis and gliosis.

BLACK WATER fever, a rare but often fatal complication of malaria, is caused by a severe hemolytic crisis which is accompanied by jaundice and hemoglobinuria. The renal complications of black water fever are a form of lower nephron nephrosis .

Kala-Azar

Visceral Leishmaniasis (Kala-Azar). This is a chronic febrile disease caused by Leishmania donovani, transmitted by the bite of a sandfly (Phlebotomus). The visceral form results in emaciation, anemia, hepatomegaly and splenomegaly and is often fatal. It is prevalent among children and young adults in Mediterranean countries, eastern India and northern China. Leisliman-Donovan bodies, two to four microns in diameter, are found in macrophages in the liver and spleen. In the sandfly the flagellate organism (leptomonad form), which develops in the gut, migrates to the buccal cavity and is discharged through feeding. The sandfly becomes infected by ingesting the leish­manian forms described above.The incubation period of the disease is from six weeks to several months. A high fever for several weeks alternates with longer periods of remission. By the end of six months, the liver and spleen are markedly enlarged. The regional lymph nodes are appreciably enlarged, only if cutaneous leishmaniasis (so-called Oriental sore) de­velops. The bone marrow is hyperplastic. The intestinal villi may be enlarged by foci of the disease.

Sarcoidosis

Sarcoidosis is a disease of unknown etiology believed by some to be a hyperimmune form of tuberculosis. Granulomatous lesions resembling tubercles without casea­tion develop in the regional and medi­astinal lymph nodes, in the spleen and in the bones and skin. The disease as a rule pursues a slow, benign course, with spon­taneous healing. More rarely a fatal course is observed with involvement of the lungs, nervous system and the heart. Lymphadenopathy and splenomegaly are usually present. The osseous lesions produce foci of bone resorption. When the uveal tract of the eye and the parotid glands are in­volved the condition is known as Heerfordt's syndrome. Involutional changes in the granulomatous nodules may result in the deposition of amyloid. A significant number of patients have a falsely positive Wassermann reaction and an unexplained increase in plasma globulins.

Brucellosis

Brucellosis (undulant fever) affects primarily the reticuloendothelial system, the joints and at times the reproductive organs, heart, vessels, lungs, meninges and kidneys. Three organisms, B. melitensis, B. abortus, and B. suis may produce the disease. The reservoir of infection is in goats, cattle and pigs. Infection occurs through contaminated milk or through meat handling. The organ­isms lodge in the lymph nodes and then in the blood stream. Diagnosis is confirmed by agglutination of Brucella organisms by the patient's serum. In the common nonfatal form there is a low-grade undulating fever. loss of weight, cough or gastro-intestinal symptoms with enlargement of the lymph nodes and spleen. These symptoms may persist intermittently for years. A maculo-papular skin eruption and arthritis may occur. The characteristic lesion is granulomatous with an infiltrate of epithelioid cells, macrophages and giant cells resem­bling the Reed-Sternberg cell of Hodgkin's disease. In rare fatal cases with septicemia there is necrosis of lymphoid tissues and widespread thrombophlebitis. Infected em­boli may produce mycotic aneurysms.

Infectious Mononucleosis

Infectious Mononucleosis (Glandular Fever). This is a benign febrile disease characterized by lymphadenopathy and lymphocytosis. It is probably of viral origin, with a portal of entry through the naso­pharynx and cervical lymph nodes. It has been described in the Hematology section. Splenic enlargement is present in 50 per cent of the cases and rupture of the spleen may occur in rare instances.

Infectious Splenomegaly

Hyperplasia of the spleen with infectious disease may be acute or chronic. Acute hyperplastic splenitis (acute splenic tumor) occurs with septicemia or in the presence of severe pyogenic infections. The spleen is enlarged and soft. The follicles may be enlarged and phagocytosis is active.
In protozoan and bacterial diseases that affect the reticuloendothelial system, such as visceral leishmaniasis, African trypanosomiasis, malaria, etc., the enlarged spleen acts as a clearing house for phagocytosis and is engorged with parasites and para­sitized macrophages.With chronic splenic hyperplasia found in advanced stages of syphilis, tuberculosis, brucellosis, malaria, leishmaniasis, trypanosomiasis, schistosomiasis and infectious ar­thritis (Felty's syndrome) there is increase of both the lymphoid and connective tissue elements. The capsule is often thick and opaque. There may be endothelial hyper­plasia and hyalin changes in the arterioles. The infectious diseases of the spleen and reticuloendothelial system are:
(1)Infectious mono nucleosis
(2)Brucellosis
(3)Sarcoidosis
(4)Visceral leish maniasis
(5)Malaria
(6)Bartonellosis
(7) Histoplasmosis
(8)Toxoplasmosis
(9)Schistosomiasis
(10) Trypanosomiasis(11)Relapsing fever
(12)Melioidosis and Glanders

Congestive Splenomegaly

Passive congestion of the spleen occurs with cardiac decompensation. The spleen is enlarged and firm because of the retention of blood in the pulp sinusoids.In Banti's syndrome more severe congestive splenomegaly occurs with portal hyper­tension. The retained blood dilates the sinusoids and thickens their walls. Increased blood destruction leads to anemia and leukopenia. The condition may result from hepatic cirrhosis or from pressure on or thrombosis in the portal or splenic veins. These are associated with gastric hemorrhages. In such cases anemia is relieved by splenectomy, but the gastrointestinal hem­orrhages may recur.

SPLEEN


The spleen is an integral part of the reticuloendothelial system and diseases of this organ are rarely confined to it alone. Instead, splenomegaly usually reflects a more widespread disorder which involves additional structures, such as the lymph nodes, bone marrow and liver.

Chloroma

When tumor nodules of leu­kopoietic tissue (with a green color) are found in the bone marrow associated with a leukemic: blood count, the condition is known as chloroma. The neoplastic cells may be either myelogenous or monocytic in such conditions. Fever, joint manifestations, and periorbital tumors are common. The disease is always fatal.

Plasma Cell Leukemia

Plasma cell leu kemia has not been reported in the absence of multiple myeloma of the bones or extramedullary plasmacytoma except in a few rare instances. The signs suggestive of leukemia are circulating plasma cells, a total leukocyte count as high as 60,000 or more and anemia.

Eosinophilic Leukemia

Wintrobe stales that about 20 cases of eosinophilic leukemia have been reported with a fatal course. Enlargement of the spleen, liver and lymph nodes occurs and symptomatic purpura may develop. A leukocyte count as high as 200,000, with over 90 per cent eosinophils, may occur.

Leukemia



The various forms of leukemia are fatal diseases characterized by uncontrolled proliferation of leukopoietic tissue. The cell may be myelocytic, lymphocytic or monocytic. The diseases may be acute, subacute, or chronic. In the acute form, myeloblasts, lymphoblasts or monoblastic cells are seen in the peripheral circulation or are found in increased numbers in the bone marrow. In the chronic varieties im­mature cells more highly differentiated than the blast stage are found either in the circulation or in predominant numbers in the bone marrow. Anemia is present and is more severe in the acute or terminal phases, it is associated with thrombocyto­penia and a tendency to hemorrhage. Not all leukemias have a high white count, even though the leukopoietic tissues are hyperplastic, because the marrow may be unable to mobilize the cells. In such cases the white count will be low or normal with the presence of a few immature leukocytes. Such leukemias are called aleukemic, leukopenic or subleukemic.In nearly all forms of leukemia the liver, spleen and lymph nodes are infiltrated, in addition to the bone marrow. The liver is often conspicuously enlarged. In myelogenous leukemia, the spleen may weigh as much as 5,000 Grams. and a diagnosis of this form of leukemia is favored clinically when increased numbers of atypical leukocytes are found in the circulating blood in the presence of pronounced splenomegaly. In lymphocytic and monocytic leukemia, the lymph nodes are usually enlarged. Inflamed or bleeding gums are often important clinical manifestations. Secondary infiltrations may be found in any organ in all varieties of leukemia. Involvement of the skin is known as leukemia cutis. Massive growths may occur in the osseous or periosseous structures. Terminal infections or hemor­rhages are usually associated with the pro­found anemia or thrombocytopenia that results from leukemic replacement of the normal marrow.

Tuesday, April 15, 2008

Leukemoid Reaction

This is characterized by an elevated leukocyte count that closely resembles leukemia. Such leukocytic reactions have been found occasionally in various infections, chemical and drug poisonings, severe burns, severe hemorrhages or sudden hemolysis of blood and in meta­stases to bone. The clinical history, subse­quent course, or bone marrow biopsy may be necessary for differential diagnosis.

Agranulocytosis

This disease is characterized by an absence or a marked decrease in the number of neutrophils in the differ­ential count. Most cases have been re­ported in patients who have acquired a sensitivity to certain drugs, among them amidopyrine, organic arsenicals, sulfonamides, dinitrophenol, thiouracil, and gold salts. There is a low white count but no anemia. The platelet count and the bleed­ing and coagulation times are normal. The sedimentation is increased. The patient suffers from lever, weakness and usually from gangrenous ulcerations and infection of the throat (agranulocytic angina). Other severe infections and septicemia may occur unless penicillin is administered during the leukopenic phase of the disease.

LEUKOPOIETIC SYSTEM

Infectious Mononucleosis, Infectious Lymphocytosis, and Tropical Eoshiophilia.Infectious mononucleosis is usually described with hematologic diseases. It is a febrile disease of probable viral origin, affecting the reticuloendothelial system and producing lymphadenopathy, splenomegaly and an increase of mononuclear cells in the peripheral blood. The leukocyte count may be as high as 40,000 and contain 50 to 90 per cent of large lymphocytes, many of which are atypical and known as Downey cells. A positive test for heterophile antibodies distinguishes this disease from a similar one in children known as infec­tious lymphocytosis, in which this test is negative. In tropical eosinophilia the white count may be as high as 15,000 with 60 per cent or more eosinophils of the mature type. Many of the patients give a past his­tory of malarial infection and persistent respiratory complaints and at times a low grade fever. There is no demonstrable cause. Recovery occurs without specific treatment.

Abortion


Up to 20% of pregnancies abort before 20 weeks; there are usually no apparent reasons for abortion. The greater the amount of bleeding, the more likely the female is to develop shock (orthostatic drop in blood pressure; pallor and sweating); shock is a major risk during abortion.

Septic abortion-

HISTORY-Pregnant less than 20 weeks; often a history of trying to induce abortion; fever, chills, and severe pelvic pain. The woman is often unmarried and without parental support.

PHYSICAL EXAM-Fever with abortion; exquisitely tender uterus or adnexae often present. Hypotension, pallor, and sweating are frequently present.

Threatened abortion

HISTORY- Pregnant less than 20 weeks; vaginal bleeding; may have cramps.
PHYSICAL EXAM-Cervix is closed.

Imminent abortion

HISTORY-Pregnant less than 20 weeks; vaginal bleeding; may have cramps.but usually has cramps.
PHYSICAL EXAM-Cervix is dilated

Inevitable abortion

HISTORY-Pregnant less than 20 weeks; vaginal bleeding; may have cramps.
PHYSICAL EXAM-Cervix is dilated; fetal or placental tissue is protruding from cervix.

Incomplete abortion

HISTORY-As above, but may have noted passing of tissue; cramps and bleeding persist.
PHYSICAL EXAM-Cervix is dilated; fetal or placental tissue may be present.

Complete abortion

HISTORY-Pregnant less than 20 weeks; fetal or placental tissue has been passed; cramps and bleeding have ceased.
PHYSICAL EXAM-Somewhat variable, depending on time since abortion. Prompt closing of cervix expected after completed abortion.

Placenta previa or abruptio placentae

HISTORY-Excessive vaginal bleeding during the third trimester.
PHYSICAL EXAM-Hypotension from blood loss may be present; fundus of uterus consistent with third term of pregnancy.

Bloody show

HISTORY-Minimal bleeding and passage of mucus plug prior to delivery; uterine contractions.
PHYSICAL EXAM-Term pregnant uterus

Menstrual cramps

HISTORY-Nonpregnant woman; cramps and bleeding in association with menstrual period.
PHYSICAL EXAM-Normal pelvic exam

Purpura



Thrombocytopenia (Purpura Hemorrhagic, Idiopathic Purpura). This disease is characterized by diminution of the platelets with prolonged bleeding time and a nonretractile blood clot. The coagu­lation time in glass is not markedly affected. Clinically, there are spontaneous hemor­rhages, epistaxis, menorrhagia and petechiae in the skin or mucous membranes. Children and young adults are most fre­quently affected. Capillary resistance is diminished and the so called tourniquet test is positive. In order to make a diag­nosis of primary purpura it is necessary to rule out acute leukemia or aplastic anemia. There is no enlarged spleen, such as occurs in Banti's disease, Gaucher's disease or hemolytic jaundice. The blood shows a re­duction of platelets, fewer than 60,000 per cubic. millimiter. and the platelets vary in size and staining characteristics. There may be an anemia due to blood loss, and a posthemorrhagic leukocytosis with relative lympho­cytosis. The marrow shows increased num­bers of megakaryocytes but inhibited plate­let production. Small, repeated transfusions of whole blood are temporarily beneficial. Splenectomy may be curative.
Anaphylactoid Purpura (Schonlein and Henoch's Purpura). this condition is due to increased permeability of the capillary endothelium which permits extravasation of blood into the tissue spaces. Henoch's variety is characterized by colic and other gastro-intestinal symptoms, which often precede the purpuric eruptions so that needless operations may be performed. Schonlein's purpura is characterized by effusion into the joints and periarticular structures, which may precede the purpuric manifes­tations so that an erroneous diagnosis of rheumatic fever may be made.


Myeloid Metaplasia (Megakaryocytic Myelosis). A number of cases have been reported which have in common megakaryocytic infiltrations of the bone marrow, liver and spleen. At times there is a marked leukocytosis with increased number of megakaryocytes in the peripheral blood, The constant features of the disease are the splenomegaly, the infiltration of the hemato­poietic organs with megakaryocytes, the tendency for the bone marrow to undergo progressive fibrosis and frequent fatal ter­mination. more recently, bacilli which take the acid-fast stain have been found in the lungs of these patients. Because of the in­volvement of the bone marrow by fibrosis, and the compensatory hematopoiesis in the spleen, splenectomy is contraindicated.

Polycythemia



The term polycythemia is applied to conditions in which the number of circulating red corpuscles is increased. Erythrocytosis indicates a symptomatic response to anoxia, which may occur in cardiac or pul­monary disease, or at high altitudes. Erythrocytosis is also produced by hypertrophy or tumors of the adrenal cortex, by certain poisons, such as aniline and its derivatives, phosphorus, and occasionally by some metals.


Erythremia or polycythemia vera is a chronic disease of obscure origin, with an increase in the total blood volume and the number of red blood cells. The patients have a plethoric complexion, splenic and hepatic enlargement and a variety of neurologic and vasomotor disturbances. Venous thromboses, bleeding tendency, varicosities and phlebitis, or arterial occlusion are common, due to alteration in the blood. Thrombi in the cerebral vessels may lead to hemiplegia or paresis. The red cell count varies from 7 to 10 million, as a rule. The hemoglobin may reach as high as 25 Gram (140%). The individual red corpuscles ap­pear normal. Leukocytosis is frequently present, and the platelet count may reach 4 million. Some patients develop leukemia.

Hemolytic Anemias



The hemolytic anemias are characterized by excessive blood destruction which results in such symptoms as jaundice, formation of gallstones, and increased amounts of urobilinogen and urobilin in the stools and urine. Phagocytosis of red blood cells undergoing destruction with deposition of hemo­siderin results in splenomegaly. The acute forms may result from bloodstream infec­tions or various types of hemolytic poisons. The chronic forms are often congenital dis­orders and include familial hemolytic icterus, Mediterranean anemia and sickle cell anemia.
Acute Hemolytic Anemia. Acute hemolytic anemia may result from mismatched transfusions, hemolytic toxins, such as snake venoms, bacterial toxins, phenyl hydrazine or phenol, and from malaria or bartonellosis. The symptoms include chills and rigor, vomiting and diarrhea, pain in the back and legs, hemoglobinuria, albuminuria and anuria. The red blood cells show marked variation in size and staining re­action. There is striking evidence of regen­eration, including reticulocytosis and cir­culating normoblasts. Treatment consists of removal of the cause.


Acquired and Congenital Hemolytic Icterus. In congenital hemolytic icterus repeated crises of blood destruction occur, with fever, abdominal pain and nausea. Once severe anemia and jaundice develop, they tend to persist. The spleen is enlarged, gallstones are found in 68 per cent of the cases, skeletal anomalies such as tower skull occur, and chronic leg ulcers are common. Reticulocytes, small dense red cells (sphcrocytes) and increased fragility of red cells to hypotonic salt solution are the chief blood findings. The acquired form is simi­lar to the congenital, but the increased fra­gility of the red blood cells may be absent. Both forms show an increased icteric index, at times as high as 100, and a hyperplastic bone marrow on sternal puncture. Both are benefited by splenectomy.
Sickle Cell Anemia. This is a hereditary disease in Negroes. It is characterized by the appearance of sickle-shaped red corpuscles in blood which has been standing away from oxygen two to six hours after it has been withdrawn and protected from drying. The cells show increased resistance to hypotonic salt solution. The patients suf­fer from jaundice, rheumatic pains in the extremities, leg ulcers, and irregular thick­enings of the cortex of the bones. There is no satisfactory treatment.
Mediterranean Anemia (Thalassanemia). This is a familial disease in individuals of Mediterranean stock. Those afflicted are often short in stature and have a large head. The bones about the hands and wrists may have increased density on roentgen exami­nation. Examination of the blood shows variations in the size and staining reactions of the red blood cells. Nucleated forms are common. The hemoglobin is concentrated at the periphery of the red corpuscle or as a central dot forming so-called target corpuscles. Uniformly colored cells are rare. There is often a leukocytosis. The icteric index is moderately increased. The spleen is enlarged and infarcts are common. Later the organ shrinks and is fibrosed. The bone marrow is hyperplastic. Severe forms are present in children; milder forms in adults. Transfusion is of temporary value but there is no specific treatment.


Erythroblastosis Fetalis. This is a hemolytic anemia, occuring late in fetal life or in the newborn, in a child whose blood agglutinogens differ from its mother's. As a regenerative response to blood destruction, the hematopoietic centers in the bone mar row, liver and spleen become crowded with erythroblasts, hemosiderin and foci of hematopoiesis. Nucleated red blood cells appear in the peripheral blood. The infant in severe cases is edematous and jaundiced, and hence the terms fetal hydrops and familial icterus gravis. The basal ganglia of the brain may be deeply icteric, so called kernicterus.In rare instances the incompatibility of the fetal and maternal bloods is because of the ABO grouping. However, the cause of the disease nearly always is the immunization of the RH negative mother by previ­ous transfusions with RH positive blood cells or by RH positive red cells of the fetus. The mother's RH antibodies pass into the fetal circulation and damage the child's erythrocytes. The offspring of an RH posi­tive father and RH negative mother always will be RH positive if the male is homozy­gous (all dominant genes for RH). If the RH positive father is heterozygous (one or two of the genes recessive) 50 per cent or less of the offspring will be RH positive. Levine found that 87 per cent of the white population is RH positive. The mothers of infants developing erythroblastosis fetalis belong to the 13 per cent who are RH nega­tive. The treatment consists of an adequate number of transfusions or exchange trans­fusions from a compatible RH negative donor.

Hypopoietic Anemias


Aplastic Anemias. The aplastic anemias may follow poisoning with benzol, arseni cals, gold or radiant energy (x-ray or radium). Idiopathic aplastic anemia may develop rapidly without known cause. There is a characteristic triad in these cases, con­sisting of progressively severe anemia, thrombocytopenia and leukopenia. The absence of a palpable spleen helps to distinguish this condition from aleukemic leu­kemia. The red corpuscles are normal in appearance. Nucleated and stippled forms and other signs of regeneration are absent. The bone marrow is hypoplastic. The white count usually shows 70 to 90 per cent lymphocytes. Repeated transfusions are usually the only remedy.
Repressive Anemia. This anemia is the simple chronic type, and occurs sympto matically in chronic infections, renal disease, malignancy, endocrine disorders, preg­nancy and vitamin deficiencies other than B 12. Erythropoiesis is inhibited by circula­tory toxins or other causes. The red cell count rarely Calls below 3.5 million. The number of cells, their size and the quantity of hemoglobin are proportionately decreased, so that the anemia is normocytic. Evidence of regeneration or increased blood destruction is usually absent.

Myelophthisic Anemias. This form of anemia is produced by replacement of the marrow by nonfunctioning elements. Metastatic carcinoma to bone, multiple mye­loma, myelosclerosis and lipoid storage dis­eases affecting bones are etilogic factors. Pain referred to the skeleton and spleno­megaly are often present. The anemia is variable in degree and most often normo cytic. Primitive red blood cells or leukocytes may be found in the peripheral circu­lation, together with reticulocytes and stippled cells. Roentgenography of the skeleton aids in diagnosis. Treatment must be directed to the underlying condition.

Deficiency Anemias


Acute Blood Loss. Severe anemia may result from a deficiency of all the circulating elements, following acute blood loss. This occurs with post traumatic hemorrhage, ruptured duodenal ulcer, ectopic pregnancy and in hemophilia. The etiology of the condition is exsanguination and the sympto­matology is that of shock. The blood vol­ume is first replaced by plasma, and there is a lowering of the hemoglobin, marked increase in the platelet count and a leuko­cytosis. Rapid loss of one third of the blood volume (1500-2000 CC.) is usually fatal, but 50 per cent may be lost more slowly, over a period of more than 24 hours, without death. The administration of plasma or transfusions may be life saving.
Iron Deficiency. Patients of either sex with chronic iron deficiency usually give a history of chronic blood loss (melena, hemoptysis, epistaxis or metrorrhagia). Iron deficiency may also develop during periods of maximum growth in childhood, puberty and pregnancy because of its increased utilization. The blood picture is of the hypochromic, microcytic type. Because of the iron deficiency the red cells contain less hemoglobin and there is a low mean corpuscular hemoglobin concentration. Fatiga­bility, headache, weakness or dyspnea on exertion are outstanding symptoms. The finger nails may be brittle and spoon shaped. This type of anemia responds to iron therapy.


Deficiency of Anti-Anemic Principle (B12,) in Pernicious Anemia. The liver Under normal conditions stores an antianemic factor which is absorbed from food of high protein content, such as liver, yeast and eggs. Absorption of this extrinsic factor is aided by a factor in gastric secretion, for­merly called the intrinsic factor. The in­trinsic factor is apparently absent in pa­tients suffering achylia in pernicious anemia and in certain stomach disorders. The essential extrinsic factor is apparently vita­min B 12. The interaction of these two fac­tors and their absorption from the gastro­intestinal tract provides the antianemic principle stored in the liver. Its formation and absorption may be interfered with in cases of diarrhea or steatorrhea (sprue or celiac disease), or its storage in the liver may be reduced in hepatic diseases, such as cir­rhosis, with resultant macrocytic anemia. This anti-anemic principle, which is neces­sary for the maturation of red blood cells, has been designated vitamin B 12.
In pernicious anemia caused by vitamin B12 deficiency the patients have a characteristic lemon color tint. Neurologic symptoms, such as parathesias and difficulty in walking, may be prominent, and the anemic triad, pallor, weakness and dyspnea, is pres­ent. In sprue, celiac disease and pellagra, there are diarrhea and loss of weight. All patients with macrocytic anemia may suffer with sore tongue and a variety of gastro­intestinal disturbances. The blood findings in this type of anemia are characterized by macrocytosis, hyperchromia and marked variation in the size and shape of the red blood cells. Following specific therapy, signs of blood regeneration (reticulocytosis) are seen. There is leukopenia in which large multisegmented neutrophilic leukocytes are conspicuous. The platelet count may be lowered. In relapse, the icteric index may be raised to 20 or more units (normal, from 5 to 7) and circulating normoblasts are numerous. There is a marked hyperplasia of the bone marrow in which the count of nucleated red blood cells may reach 50 per cent or more with megaloblasts predomi nating. This group of anemias responds specifically to liver therapy or vitamin B 12.

Anemias


The anemias may be divided into threemajor groups. those resulting from a specific deficiency (deficiency anemias), those resulting from lowered hematopoietic func­tion (hypopoietic anemias), and those caused by increased blood destruction (hemolytic anemias).

Hematopoietic System


In the embryo the blood cells are formed from the mesenchyme of the blood islands. Later this mesenchyme forms the endo­thelium of blood capillaries of bone marrow, lymph nodes, spleen and liver but retains its erythropoietic functions. The mesenchyme associated with this endothe­lium forms reticulum and gives rise to granulocytes, monocytes and lymphoid ele­ments. In the bone marrow the red blood cells arise within the capillaries from endothelium, while the granulocytes are formed extravascularly from reticulum. The stromal elements about embryonal lymphatics are the antecedents of lymphoid tissue. Reticu­lum cells in this stroma form large lymphoblasts which develop into small lympho­cytes. Large phagocytic cells or histiocytes can arise either from this reticulum, from undifferentiated connective tissue or from the endothelial lining of lymphatic or venous sinuses, in the liver, spleen, lymph nodes, etc. Collectively these tissues which furnish histiocytes are referred to as the reticuloendothelial system.
The hematopoietic organs and their associated structures are divided into two classes, 1. the erythropoietic tissues and, 2. the leukopoietic tissues.
The diseases of the erythropoietic tissues include polycythemia, the various forms of anemia, the purpuras and megakaryocy-tosis. Primary neoplasia of the erythro­poietic system is not definitely established.The diseases of the leukopoietic tissue include a variety of chronic infections and neoplastic diseases which involve myeloid and lymphoid elements.

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Halitosis


Halitosis is a condition where patient feels unpleasent or a type of offensive odors in air, it may be due to poor oral hygiene or oral cavity usually seen in patients who are social handicap, some times raely it is a presentation of serious systemic illness which require diagnosis and treatment.
Etiology
Physiologic halitosis
, such as with eating onions and garlic or with morning breath, is temporary. These odors are reversible, transient, and responsive to Simple oral hygiene. pathologic halitosis is more intense and not easily reversible. It may arise from similar mechanisms but results more frequently from regional or systemic pathology, leading to persistent odors that ultimately require treatment.Persistent halitosis (usually noted by individuals around the patient) is more severe than physiologic halitosis. The important task initially is to categorize the halitosis as either localized to the oral cavity or originating systemically. In 80% to 90% of patients, halitosis is due to bacterial activity from disorders
of the oral cavity, and in the remainder of patients, the condition is attributed to nonoral or systemic sources. Volatile sulfur compounds arising through the microbia degradation of amino acids are the presumed source of most offending odors. Bad breath may originate from the following areas: oral cavity 85% to 88%, nasal passages 8%, tonsils 3%, and other sites 2% to 3% . In addition, the causes of halitosis can be subcategorized into pathologic and nonpathologic types.
Nonpathologic causes Morning breath is due to decreased salivary flow overnight associated with increased fluid pH, elevated gram-negative bacterial growth, and volatile sulfur
compounds production. Xerostomia of any cause (e.g., sleep, diseases, medication, mouth breathing, and especially age-related declines in salivary quantity and quality) can contribute to halitosis. Missed meals can lead to halitosis secondary to decreased salivary flow and the absence of the mechanical action of the food on the tongue surface to wear down filiform papillae. Tobacco or alcohol can be a contributing cause of halitosis. Metabolites from ingested food (onions, garlic, alcohol, pastrami, and other meats) are absorbed into the circulation and then excreted through the lungs. Medications such as anticholinergic drugs can cause xerostomia, especially in the elderly. Other agents include amphetamines, psychiatric drugs,
antihistamines, decongestants, narcotics, antihypertensives, anti-parkinsonian agents, chemotherapy, and radiation therapy.
Pathologic causes Local oropharynx Chronic periodontal disease and gingivitis are common sources through the promotion of bacterial overgrowth. In their absence, the most likely oral source is the posterior dorsum of the tongue with posterior nasal drainage being a frequent contributing factor to local bacterial overgrowth. Stomatitis and glossitis caused by systemic disease, medication, or vitamin deficiencies can lead to trapped food particles and desquamated tissue. An improperly cleaned prosthetic appliance can be a local contributor, as can primary pharyngeal cancer. Other conditions associated with parotid dysfunction (e.g., viral and bacterial infections, calculi, drug reactions, systemic conditions including 'sgren's syndrome) are also important. Tonsils infrequently cause halitosis (found in 7% of the population), even with crypt tonsillitis. These may alarm patients but are usually asymptomatic and not associated with any
pathology. Gastrointestinal tract Gastrointestinal sources occasionally contribute to intermittent bad breath. Potential sources include gastroesophageal reflux disease, gastrointestinal bleeding, gastric cancer, malabsorption syndromes, and enteric infections. Respiratory tract Chronic sinusitis, nasal foreign bodies or tumors, postnasal drip, bronchitis, pneumonia, bronchiectasis, tuberculosis, and malignancies may cause halitosis. Psychiatric Halitophobia is imaginary halitosis associated with psychiatric disorders. Systemic sources include diabetic ketoacidosis (sweet, fruity, acetone breath), renal failure (ammonia or fishy odor), hepatic failure (fetor hepaticus a sweet amine odor), high fever with dehydration, and vitamin or mineral deficiencies leading to a dry mouth
Epidemiology
The prevalence of halitosis is not known, but many individuals worry about it. In one study, 20% of adults worried about bad breath, when little was measured. Approximately 25% of individuals seeking help for halitosis may be halitophobic or suffering from pseudohalitosis.
History
Focus on the characteristics of the bad breath, although the patient is often unable to describe his or her condition accurately because of olfactory desensitization. Is the odor transient or constant? Constant odor suggests chronic systemic disease or serious disorders of the oral cavity. What are the precipitating, aggravating, or relieving factors? Ask about smoking habits, diet, drugs, dentures, mouth breathing, snoring, hay fever, and nasal obstruction. Because the therapy for halitosis of oral origin, beyond the limitation of aggravating factors, is proper oral hygiene and vigorous tongue brushing, an evaluation of the patient's tooth brushing and flossing regimen is imperative.
Physical examination
This should be undertaken with an emphasis on the oral cavity, particularly looking for ulceration, dryness, trauma, postnasal drainage, infections, inflamed cryptic tonsils, or neoplasms. Techniques for localizing the odor source (systemic vs. oral cavity) include: Seal the lips and blow air through the nose. If a fetid odor is noted, this is suggestive of a systemic source. If an odor is only noted from the nose, then a nasal source is likely. Pinch the nose with the lips closed. Hold respiration and exhale gently through the mouth. Odors detected in this fashion generally are local in origin. If a similar odor is noted from both sources then a systemic source may be suspected.
Testing
For most patients, clinical laboratory testing and diagnostic imaging are unnecessary, and should only be pursued on the basis of specific findings indicated by the history and physical examination. The Schirmer's test may be useful in identifying xerophthalmia and associated xerostomia seen with Sjgren's syndrome and some other rheumatologic conditions. If indicated, radiologic studies and imaging procedures of the sinuses, thorax, and abdomen may be used to
identify infectious processes and neoplasms.
In addition to fetid odor, there may be ulceration, dryness, trauma, postnasal drainage, infections, inflamed cryptic tonsils, or neoplasms.

Monday, April 14, 2008

Transmission of HIV infection


HIV-1 and HIV-2, the major and minor human AIDS viruses,are transmitted in ways that are typical for all retroviruses –“vertically” – that is from mother to infant, and “horizontally”through sexual intercourse and through infected blood. Thelymphocytes of a healthy carrier of HIV replicate, andeliminate, over one billion virions each day and the circulatingvirus “load” may exceed ten million virions per millilitre. Atthese times viraemia can be recognised by measuring the p24antigen of HIV in blood and quantifying viral DNA or RNA(see below). Transmission also depends on other factors,including the concentration of HIV secreted into body fluidssuch as semen, secondary infection of the genital tract, theefficiency of epithelial barriers, the presence or absence of cellswith receptors for HIV, and perhaps the immune competence ofthe exposed person. All infections with HIV appear to becomechronic and many are continuously productive of virus. Theultimate risk of spread to those repeatedly exposed is thereforehigh.The stage of infection is an important determinant ofinfectivity. High titres of virus are reached early in infection,though this phase is difficult to study because symptoms may bemild or absent and any anti-HIV response undetectable; it isnevertheless a time when an individual is likely to infectcontacts. When, much later, the cellular immune response toHIV begins to fail and AIDS supervenes the individual mayagain become highly infectious. In the interval between, theremay be periods when except through massive exposures – forexample blood donation – infected individuals are much lessinfectious. Nevertheless, in the absence of reliable markers ofinfectivity, all seropositive individuals must be seen aspotentially infectious, even those under successful treatment.Effective ways are constantly being sought to protect theircontacts and this has led to the development of the concept of“safe sex”. Ideally, this should inform sexual contact between allindividuals regardless of whether they are known to be infectedwith HIV.

Strategies for HIV vaccine development


• A good vaccine should induce neutralising antibody, helperT-cells and cytotoxic T-cells.

• Since antibodies bind to three dimensional structures,induction of neutralising antibody requires native envelope.Problem: Native envelope is trimeric.

• T-cells recognise 8–15 amino acid-long peptides bound toMajor Histocompatibility Complex (MHC) class I and IImolecules.Problem: Antigen needs to enter antigen presenting cells,usually dendritic cells, to be broken down to peptides.

• Peptides with novel adjuvants can generate good T-cellresponses.Problem: Different peptides bind to each MHC allele so alarge cocktail of different peptides may be needed.

• Adjuvants are needed to induce large responses.Problem: There are very few adjuvants available forunrestricted use in humans. Alum is mainly good for inductionof antibody responses.

• DNA immunisation can generate antibody, helper andcytotoxic responses and allows incorporation of adjuvantmolecules into the vaccine.Problem: So far DNA vaccination has not proved as effectivein man as in experimental animals.

• HIV is very variable and escape variants arise rapidly ininfected individuals. Prophylactic immunisation may tip thebalance in favour of the host and prevent escape. Some partsof the virus sequence are relatively invariant, these should betargeted if possible.

• In experimental animals immunisation with differentimmunogens appears promising. DNA vaccination followed byimmunisation with antigen in a recombinant viral vector seemsparticularly effective. This is now under trial in man.

History of the AIDS


The first recognised cases of the acquired immune deficiencysyndrome (AIDS) occurred in the summer of 1981 in America.Reports began to appear of Pneumocystis carinii pneumonia andKaposi’s sarcoma in young men, who it was subsequentlyrealised were both homosexual and immunocompromised. Eventhough the condition became known early on as AIDS, itscause and modes of transmission were not immediatelyobvious. The virus now known to cause AIDS in a proportionof those infected was discovered in 1983 and given variousnames. The internationally accepted term is now the humanimmunodeficiency virus (HIV). Subsequently a new variant hasbeen isolated in patients with West African connections –HIV-2.The definition of AIDS has changed over the years as aresult of an increasing appreciation of the wide spectrum ofclinical manifestations of infection with HIV. Currently, AIDSis defined as an illness characterised by one or more indicatordiseases. In the absence of another cause of immune deficiencyand without laboratory evidence of HIV infection (if thepatient has not been tested or the results are inconclusive),certain diseases when definitively diagnosed are indicative ofAIDS. Also, regardless of the presence of other causes ofimmune deficiency, if there is laboratory evidence of HIVinfection, other indicator diseases that require a definitive, orin some cases only a presumptive, diagnosis also constitute adiagnosis of AIDS.In 1993 the Centers for Disease Control (CDC) in the USAextended the definition of AIDS to include all persons who areseverely immunosuppressed (a CD4 count <200>

AIDS-defining conditions with laboratory evidence of HIV


• Diseases diagnosed definitively

• Recurrent/multiple bacterial infections in child <13>
• Coccidiomycosis – disseminated

• HIV encephalopathy• Histoplasmosis – disseminated

• Isosporiasis with diarrhoea persisting >1 month

• Kaposi’s sarcoma at any age

• Primary cerebral lymphoma at any age

• Non-Hodgkin’s lymphoma: diffuse, undifferentiated B cell type, or unknown phenotype

• Any disseminated mycobacterial disease other than M.tuberculosis

• Mycobacterial tuberculosis at any site

• Salmonella septicaemia: recurrent

• HIV wasting syndrome

• Recurrent pneumonia within 1 year

• Invasive cervical cancer

• Diseases diagnosed presumptively

• Candidiasis: oesophagus

• Cytomegalovirus retinitis with visual loss

• Kaposi’s sarcoma

• Mycobacterial disease (acid-fast bacilli; species not identified by culture): disseminated

• Pneumocystis carinii pneumonia

• Cerebral toxoplasmosis

Transmission of the HIV virus


HIV has been isolated from semen, cervical secretions,lymphocytes, cell-free plasma, cerebrospinal fluid, tears, saliva,urine, and breast milk. This does not mean, however, that thesefluids all transmit infection since the concentration of virus inthem varies considerably. Particularly infectious are semen,blood, and possibly cervical secretions. The commonest mode oftransmission of the virus throughout the world is by sexualintercourse. Whether this is anal or vaginal is unimportant.Other methods of transmission are through the receipt ofinfected blood or blood products, donated organs, and semen.Transmission also occurs through the sharing or reuse ofcontaminated needles by injecting drug users or for therapeuticprocedures, and from mother to child. Transmission frommother to child occurs in utero and also possibly at birth. Finally,the virus is transmitted through breast milk.The virus is not spread by casual or social contact. Healthcare workers can, however, be infected through needlestickinjuries, and skin and mucosal exposure to infected blood orbody fluids. Prospective studies in health care workers sufferingpercutaneous exposure to a known HIV seropositive patientindicate a transmission rate of 0.32%. As of December 1999there have been 96 reported cases of documentedseroconversion after occupational exposure in such workers.
The precautions and risks for such groups are covered indetail in chapter 15. Finally, there is no evidence that the virusis spread by mosquitoes, lice, bed bugs, in swimming pools, orby sharing cups, eating and cooking utensils, toilets, and airspace with an infected individual. Hence, HIV infection andAIDS are not contagious.

The HIV virus and the tests


Although it is clear that HIV is the underlying cause of AIDSand AIDS-related disease, its origin remains obscure. There isfirm serological evidence of infection on the east and westcoasts of the USA from the mid 1970s, and HIV infection incentral Africa may have antedated infection in North America.Phylogenetic analysis of the HIV-1 genome has suggested anorigin in chimpanzees while, in the case of HIV-2, similarity tothe simian immunodeficiency virus (SIV) genome may point toan origin in sooty mangabey monkeys. In both cases thebutchery and consumption of these “bush meats” has beenincriminated in transmissions to the human host. Like someother RNA viruses, HIV appears to have mutated and shifted itshost range and virulence, explaining how a new pathogenicretrovirus could arise in man. Its virulence may since have beenamplified as a result of travel, population dislocation andpromiscuous sexual contact, with rapid passage of the virus.
Retroviruses are so named because their genomes encode anunusual enzyme, reverse transcriptase, which allows DNA to betranscribed from RNA. Thus, HIV can make copies of its owngenome, as DNA, in host cells such as the human CD4 “helper”lymphocyte. The viral DNA becomes integrated in thelymphocyte genome, and this is the basis for chronic HIVinfection. Integration of the HIV genome into host cells is aformidable obstacle to any antiviral treatment that would notjust suppress but also eradicate the infection. Nevertheless,modern treatment with combinations of nucleoside analoguesand protease inhibitors has transformed the prognosis forcarriers of HIV, usually achieving a sustained fall in virusconcentration in blood and restoration of the main target cell(CD4 lymphocyte) to near normal levels.
By contrast, the inherent variability of the HIV genome andthe failure of the human host to produce neutralising antibodiesto the virus, as well as technical difficulties and concerns aboutsafety, have continued to frustrate attempts to make an effectivevaccine. This must not, however, allow efforts to develop andevaluate candidate vaccines to slacken. A particular concern isthat a useful candidate vaccine (probably a recombinantenvelope vaccine developed in North America or Europe againstthe locally prevalent HIV-1 B subtype) would be ineffective inthose parts of the world where other subtypes predominate.
WHO estimates that in the year 2000 there are 36 millioncarriers of HIV worldwide, and only a small fraction of themhave access to suppressive treatment. Both their contacts, theirdependants and possibly they themselves would have their lifeprospects transformed by an effective, or even partially effective,vaccine, and successful application of antiviral treatment indeveloped countries should in no way be allowed to deflectattention from the necessity of developing and delivering aneffective vaccine and of promoting “safe sex” behaviour.

HIV and related viruses


HIV was discovered by Barré-Sinoussi, Montagnier, andcolleagues at the Institut Pasteur, Paris, in 1983 and given thename lymphadenopathy associated virus (LAV). In 1984Popovic, Gallo, and co-workers described the development ofcell lines permanently and productively infected with the virus.In line with two previously described retroviruses, HTLV-I andHTLV-II, they designated this virus HTLV-III. Other virusisolates from patients with AIDS and AIDS-related disease inAmerica, Europe and Central Africa have proved to be all thesame virus, now referred to as HIV-1. Eight subtypes of HIV-1,alphabetically designated, have so far been described.Around 1985 another human retrovirus, different from HIV-1, was recognised in patients from West Africa. This virus,referred to by the Paris investigators as LAV-2 and morerecently as HIV-2, is also associated with human AIDS andAIDS-related disease. It is closely related to the simianretrovirus, SIV, carried by healthy African green monkeys, andthe cause of an AIDS-like disease in captive rhesus monkeys.Though potentially important worldwide, HIV-2 infectionsremain uncommon outside West Africa and they have proved farless virulent than HIV-1 infections.