Shawn Zhong, MD

• Department of Surgical Critical Care
• R Adams Crowley Shock Trauma Center, University of Maryland
• Baltimore, Maryland

By the age of 20 years ginger antiviral famvir 250 mg order on-line, almost 90% have typical linear hiv symptoms two weeks after infection famvir 250 mg purchase with amex, parallel intracranial calcification evident on skull radiograph (tram-track sign) in parietal or parieto-occipital region hiv infection stories gay buy famvir without prescription. Dermatological manifestations should be treated at the earliest (even in infancy) hiv infection rates canada generic famvir 250 mg with visa, usually by pulsed dye laser therapy hiv infection zero viral load cheap famvir 250 mg without a prescription. Glaucoma should be managed medically or surgically depending on the underlying abnormality and response. Tuberous sclerosis complex and neurofibromatosis type 1: the two most common neurocutaneous diseases. Neuroimaging of phakomatoses: Sturge-Weber syndrome, tuberous sclerosis, von HippelLindau syndrome. The type of seizure depends on the following: · · · the area of the brain producing the discharge the type of discharge the age of the patient Thus there are many different kinds of seizures: Provoked or acute symptomatic seizure Provoked or acute symptomatic seizures are seizures occurring during the course of an acute illness. Males and females are equally affected and these rates are the same in different geographical areas. Epilepsy can result from brain injury due to infections, infestations, hypoxic damage, birth injury, malformations of the brain, genetic or metabolic causes (Table 6. Pathophysiology the exact pathophysiology of epileptogenesis is still not well understood. However, it is known that seizures are produced when there is an abnormality in the: · Neurotransmitters levels · Ion channels or · Receptors. In many of the genetic epilepsies, there are abnormalities of the ion channels or receptors due to mutations, resulting in epilepsies. These abnormalities can result in hyperexcitability of neurons, which thus have a tendency to seizures. The other epilepsies result from neuronal damage because of various insults like infections, trauma and vascular events. In India and countries where cysticercosis is endemic, neurocysticercosis is the most common cause of focal seizures in children. Cryptogenic epilepsies Cryptogenic epilepsies are epilepsies, which are expected to have a cause, but despite investigations, no cause is found. This emerges from studies of epilepsy in poor countries where no treatment has been given for epilepsy because of financial constraints. Of those who are treated, 60­70% undergoes remission, while the remaining has intractable seizures. Classification of seizures and epileptic syndromes It is very important to identify the syndrome wherever possible, for starting correct treatment and prognostication, and to identify etiology and genetics. Many of the epilepsies were classified and described by the names of the persons who first described them. There was no uniformity in the classification and descriptions used in different parts of the world. Positron emission tomography and single photon emission computed tomography are functional scans that may be done to study the perfusion. They are used in preepilepsy surgery workup in refractory epilepsy and help in identifying epileptic foci. Earlier the epilepsies were classified as localization related epilepsies, generalized 340 vip. Typically, to classify an epilepsy into an epileptic syndrome, some information is required (Table 6. Practically, it is best to use the age-wise approach in classifying the epilepsies (Table 6. Differential Diagnosis of seizures and epilepsies the nonepileptic events Nonepileptic events are events, which resemble seizures but are not the result of abnormal electrical discharges. They are also known as nonepileptic attack disorder, epilepsy imitators, epilepsy mimickers and pseudoseizures. These can also produce recurrent episodes of motor movement or apparent changes of consciousness or behavior that are also seen in children with epilepsy. Nonepileptic events and epilepsies both present at all ages and in many different forms. Physiological nee: these are various physiological phenomena, which resemble seizures on observation or when described by parents. Psychogenic nee: these are seen mostly in children more than 5 years of age and are either conversion reactions or malingering. A description of event, especially an eyewitness account is very important in obtaining a correct diagnosis. For example, myoclonic jerks during sleep in a neonate may be confused with myoclonic seizures; daydreaming in a school going child may be confused with complex partial seizures. Attempts to Observe the Event this is possible if the event occurs at a particular time or is precipitated by something. Pathophysiology: the spell is actually a reflex rather than a behavior problem as was thought earlier. Cyanotic (more common): There is forceful expiration during crying, a respiratory pause (breath holding) resulting in hypoxia and cyanosis. Pallid: Vagal stimulation following a painful stimulus or during pause in respiration during expiration, results in cardiac asystole, hypoxia and pallor. Clinical presentation: the child holds his/her breath following a sudden painful stimulus and becomes pale or becomes cyanosed after a prolonged expiration while crying. There may be stiffening of the whole body, followed by a few clonic jerks making the event appear like a seizure. He/she gradually regains consciousness with return of normal color, and may remain drowsy or sleep for sometime. Common nonepileptic events Breath Holding Spells Breath holding spells are stereotypic events that occur in response to a painful stimulus or an adverse emotional event 346 Table 6. Diseases of Central nervous system Benign Neonatal Sleep Myoclonus this is a myoclonus that is sometimes seen in neonates at age of 1­2 weeks, up to 6 months of age. It comprises of repetitive jerking or myoclonic movements of the different body parts, and occurs only during sleep. Syncope Syncope is a transient loss of consciousness, resulting in loss of tone and a fall, from which the patient makes a spontaneous recovery. Twenty percent of children suffer from one or more attacks of syncope before the age of 15 years, but most of the syncopal attacks are benign in children. If there is a doubt, then the tilt table test can be done, which involves putting the patient in 70° position after strapping to a table, and checking vital parameters and symptoms of syncope in that position. Cardiac syncope should be suspected if the syncope occurs during exercise or when lying down. If the child has vasovagal syncope, the child should avoid situations that precipitate the attack. During an attack, the clothes should be loosened and the patient should be made to lie down for some time. Both forms may be difficult to differentiate from true epilepsy, just on the basis of history alone. It is important to try to observe an episode to discern whether it is a true seizure or a psychogenic one. Once diagnosed, children should undergo neuropsychological testing and counseling. Sometimes true seizures coexist with psychogenic seizures when it becomes extremely difficult to differentiate true from psychogenic seizures, leading to either undertreatment or overtreatment. Certain types of seizures and epileptic syndromes acute seizures and status epilepticus Most seizures terminate spontaneously without treatment or after administration of a fast acting anticonvulsant drug. Psychogenic Seizures Psychogenic seizures are events that resemble seizures and occur due to emotional or psychological reasons. Twenty to thirty percent of children attending epilepsy units may have psychogenic seizures. Unresponsiveness with varying degrees of motor activity, ranging from just shivering to thrashing around violently. Classification of Status Epilepticus · according to seizure type: For example, generalized tonic clonic, partial, absence · according to the clinical presentation: ­ Convulsive status: When the seizures have a predominant motor component. Metabolic derangements like acidosis, hypoglycemia and hyperkalemia can result in cardiac, respiratory and renal failure. Follow-Up Advice All parents must be taught home management of seizures with a benzodiazepine (nasal/buccal midazolam, rectal diazepam or sublingual lorazepam). Etiology Etiology of status is essentially the same as that of seizures and epilepsy (Table 6. Goals of management are to stop the seizure activity as soon as possible and prevent brain damage and systemic complications, and at the same time to support airway-breathing-circulation, carry Table 6. Characteristic seizures called infantile spasms: the child has a sudden spasm of the body in which the head, neck or trunk undergoes a contraction, resulting in either flexion (flexor spasms), but sometimes extension (extensor spasms) or flexion of one part and extension of the other (mixed spasms). They are maximum on getting up from sleep or when falling asleep (infantile spasms may be used synonymously with West syndrome by many people). Onset is most common around 3­4 months of age, and they may remit with treatment or spontaneously by around 2 years age, or they may remain uncontrolled and evolve into other syndromes (Lennox-Gastaut syndrome) or seizure types (tonic, atonic, atypical absences or myoclonic). Pathophysiology It is postulated that the hypsarrhythmia and spasms originate from the brainstem. Childhood absence epilepsy this is idiopathic generalized epilepsy with a genetic basis. Seizures these include typical absence seizures with sudden loss of consciousness, associated with automatisms in the form of lip smacking, eye blinking and hand picking. The decision regarding specific drug depends upon: · the type of seizures and epileptic syndrome · Side effects · Cost and · Lifestyle of the patient. In our set up in view of low cost, ease of administration and low side effects, phenytoin is the drug of choice. Polytherapy should be avoided because of drug interactions, and subsequent alteration of drug efficacy. It is best to calculate a target dose, and start with one-third of that, and increase by one-third every week till target dose is reached in case of drugs with short half-lives like carbamazepine and valproate. Phenytoin and phenobarbitone may be started with the full optimum dose at the start. If seizures continue, increase gradually till maximum tolerated dose is reached or seizure is controlled. Electroencephalogram Electroencephalogram shows 3 Hz spike wave discharges on a normal background. Changing Antiepileptic Drugs Start the second drug in a small dose, and build it up to a dose effective in controlling seizures. Principles of Combination Therapy · · · · Use drugs with different mechanisms of action Drugs should have large therapeutic index Few side effects Keep in mind drug interactions: Combination may cause increased toxicity or decreased efficacy. The most important consideration in management of epilepsy is the possibility of recurrence of the seizure. The decision should be taken after counseling the parents, especially after a first seizure. Partial, absence, atonic and myoclonic seizures: Because of high rates of recurrence of seizures, treatment is indicated in these seizure types. Drug Level Monitoring Drug levels may be estimated in certain specific situations (Table 6. Drug dosage should be decided by clinical control of seizure or appearance of side effects. Drugs whose levels are useful include phenytoin, carbamazepine, phenobarbitone and valproate. Initial follow-up should be: · After 4 weeks · If breakthrough seizures occur and · If side effects occur. Choice of Antiepileptic Drugs Choice of antiepileptic drugs has been described in detail in Table 6. The efficacy of the four 352 first line antiepileptic drugs (phenytoin, phenobarbital, vip. Newer antiepileptic drugs Oxcarbazepine Sameascarbamazepine Tab150mg,300mg,600mg Suspension Vigabatrin Lamotrigene 354 Tab5mg,10mg 0. Perimetry/fundoscopyregularlyto checkforvisualcomplications Usewithcarewithvalproate Levelisaffectedbyother antiepilepticdrugs Tab25mg,50mg,100mg Withvalproatestartwith0. Multipleseizuretypes Monotherapy:Refractorypartial seizuresinchildrenmorethan12 yearsofage Addonfocal/generalizedepilepsy Westsyndrome,Broadspectrum addondrugforepilepsywith multipletypesofseizures,e. Drowsiness Ataxia, Metabolicacidosis Hyperammonemiaespeciallywith valproate Gooddrugwithfewdrug interactions Topiramate Monotherapy:Focalorgeneralized Tab25mg,50mg,100mg,200mg Startwith0. In case of multiple types of seizures, each seizure type should be assigned a number, and the number be noted. Counseling explain Disease Parents should be informed about the nature of the disease and chances of recurrence with and without treatment. Some epilepsies are inherently refractory to treatment, and the poor outcome in such cases should be explained to the parents at the outset. Duration of Treatment Duration of treatment is usually 18­24 months seizure free period. Stopping Antiepileptic Drugs Before tapering, the parents must be counseled about the risk of relapse after tapering. School teachers should be informed about the nature of disease and should be specifically told not to be biased against these children. Some caution is advocated in possibly dangerous circumstances like cycling, swimming and activities near fire particularly in the first year of remission. Diseases of Central nervous system management Options include: · newer aeDs · epilepsy surgery: To remove epileptogenic foci · ketogenic diet: the diet induces ketosis by high fat and low carbohydrate diet. Ketosis has an anticonvulsant effect in certain types of epilepsies · vagal nerve stimulation: A device (the impulse generator) is implanted under the skin in the chest with a coil around the vagal nerve. The procedure must be demonstrated with normal saline before sending the patient home. Clinical Guidelines on Management of Prolonged Seizures, Serial Seizures and Convulsive Status Epilepticus in Children. The Epilepsies: the Diagnosis and Management of the Epilepsies in Adults and Children in Primary and Secondary Care.

After birth antiviral treatment for herpes famvir 250 mg with visa, the left sided ductus connects the base of left brachiocephalic or subclavian artery to the left pulmonary artery hiv infection symptoms signs cheap famvir 250 mg free shipping. This is the second most common type of vascular ring; however antiviral medication for cold sore cheap famvir 250 mg overnight delivery, they are usually loose when compared to the double arch account for hiv infection cycle buy generic famvir 250 mg on line. The hypothetical model of the double arch is shown with the red bars indicating the segments that will regress ginger antiviral buy famvir with amex. In the fetal and postnatal circulations, this arrangement produces a vascular sling on the right side of the trachea and esophagus. This produces an incomplete encirclement or vascular sling around right side of trachea and esophagus. Usually the left ductus persists in this case and therefore an incomplete vascular ring arises. Morphology the right subclavian artery originates as the last vessel of the aortic arch, from the junction of the aortic arch with the descending aorta. If the right ductus persists and the left one disappears, then a complete vascular ring will be produced. The aberrant subclavian artery is usually an isolated malformation, although it is associated with cardiac malformations in 12 percent of cases. In the postnatal circulation, a vascular sling is formed on the left side of trachea and esophagus. Courtesy: Reprinted with permission from Dr Aysel Turkvatan, Ihtisas Hospital, Turkey, Korean J Radiol. This produces overcrowding of structures within the narrow neck and causes respiratory compression. However, these patients should be screened for chromosome 22q11 deletion syndrome. The aortic arch and the proximal part of descending aorta are on opposite sides of the spine. The aortic arch passes posterior to trachea and esophagus to reach the descending aorta. Courtesy: Reprinted with permission from reference 1 natural History Untreated severe respiratory obstruction, especially starting soon after birth, is fatal before the child reaches his first birthday. Symptoms first presenting after 6 months of age are less severe and rarely progressive, except when active chest infection or aspiration occurs. Respiratory symptoms manifest in early infancy and esophageal symptoms develop later. This may be caused by aneurysmal dilatation of diverticulum of Kommerell or elongation of aorta. The incidence is especially high (38%) among Trisomy 21 children with heart disease. Laterality of arch in posterioanterior view: the tracheal air column usually shows a subtle indentation produced by the aortic arch and is bent to the opposite side. For beginners, the trick is to trace back the arch from the shadow of descending aorta, which usually forms a prominent vertical linear stripe along the vertebral column. Anterior bowing of distal trachea in lateral view: If there is a large retroesophageal mass like diverticulum of Kommerell, the distal part of trachea is bowed forward by the diverticulum. If the base of right subclavian artery gets dilated, then it causes compression to esophagus and is called arteria lusoria. Vascular anomalies of aorta, pulmonary and systemic vessels, Radiology assistant, / This chest X-ray in frontal view shows a right sided aortic arch with arrow depicting the right arch. This chest X-ray shows two paratracheal soft tissue densities (*) on both sides of trachea in a patient with double aortic arch; C. Barium esophagogram in bilateral oblique view showing extrinsic impression (arrow) on posterior esophageal wall; B. Barium esophagogram in lateral view showing bilateral posterior indentation (arrow) of the upper esophagus in a child with double aortic arch. This barium esophagogram shows the anterior compression of esophagus and arrow shows the location of anomalous left pulmonary artery coursing between the trachea and esophagus. Courtesy: Reprinted from reference 20 Box 1: Diagnostic value of the barium esophagram in vascular rings and sling20 Echocardiogram Echocardiogram is an important noninvasive, nonionizing, widely available modality for definitive diagnosis of aortic arch anomalies. Start with a downward angulation and then gently sweep upwards to acquire the best view for diagnosing aortic arch anomalies. To obtain this view, the transducer is placed in the suprasternal notch with the plane of ultrasound beams oriented between the right nipple and the left scapular tip. The position of the aortic arch in relation to tracheal rings and the origin and branching pattern of the arch vessels. However, this is time-consuming and requires prolonged sedation in pediatric patients. For example, rigid bronchoscopy in brachiocephalic artery syndrome shows compression from an anterior pulsating mass and the compression progresses from most severe on the right to less severe on the left, following the course of brachiocephalic artery as it passes from the right to left. Pressing the bronchoscope anteriorly against the tracheal wall will typically suppress the right radial or right carotid arterial pulses. Surgery is indicated in all symptomatic patients, as mortality rates of 90 percent has been reported with isolated medical management. The arch anatomy, branch vessels, aberrant courses and hemodynamic data can be very clearly inferred, but it gives limited information regarding type and level of tracheobronchial and esophageal compression. Precise diagnosis is very important for appropriate life saving management strategy. Hence, angiogram and computed tomographic angiogram could be more informative (13 A to C). However, presence of recurrent apneic spells, pulmonary infections and persistent respiratory distress are definite indications for surgery. Other potential complications of unrepaired lesions include aortic aneurysm and dissection. The real challenge is to take images of diagnostic quality with lowest possible doses of radiation. Use of 3D reconstruction allows more elaborate spatial orientation and provides a definite road map for surgery. However, infants with minimal symptoms and without significant respiratory obstruction can be managed medically. Echocardiogram in suprasternal short axis view showing a left sided aortic arch with 1st arch vessel, i. Echocardiogram in suprasternal short axis view showing a right sided aortic arch with 1st arch vessel, i. This echocardiogram in suprasternal short axis view shows the double aortic arches on corresponding sides of trachea. This subcostal echocardiographic view shows a double aortic arch with ascending aorta bifurcating into right and left aortic arches after it becomes extrapericardial. This echocardiogram in suprasternal view shows left aortic arch with aberrant right subclavian artery. The picture on left side shows a suprasternal short axis view where the 1st branch does not bifurcate but instead continues upwards, forwards and right wards, characteristic of right common carotid artery. The picture on right side shows that on inferior angulation of the transducer, the aberrant right subclavian artery arises from the distal portion of descending aorta on the left side of the midline. Kommerell diverticulum, if found, is ligated and left subclavian artery is transferred to left carotid artery by left thoracotomy Similar concept as above by right thoracotomy. Suturing of innominate artery to posterior sternum through right anterolateral thoracotomy Through midline sternotomy, the retroesophageal part of arch is divided and the mobilized aortic arch is translocated to the other side of trachea and anastomosed to the descending aorta. This is almost always associated with congenital tracheal stenosis and complete cartilaginous tracheal rings with absence of pars membranaceae posteriorly. Sixty-five percent of patients have diffuse tracheal stenosis, complete rings and tracheomalacia. An interesting feature seen in fourth-fifth of patients is abnormal branching of tracheobronchial tree. Almost all cases with low inverted T bifurcation of airways, with or without a separate origin of right upper lobe bronchus are associated with narrowing of a long segment of lower airways above the bifurcation. Aberrant right subclavian artery Box 4: Surgical Results (Excluding Associated Complete Tracheal Rings)28 Number of patients Van Son (1994) Backer (1993) Chun (1992) Azarow (1992) Marmon (1984) Roesler (1983) Arcinegas (1979) 39 249 39 21 54 51 53 Mortality (%) 2. Post extubation, continued use of warm and humidified oxygen administered by nasal prongs, chest physiotherapy and gentle meticulous suctioning help to keep the airway patent and mucosa undamaged the surgical results of procedures done in vascular rings from various series, is given in Box 4. The extracardiac anomalies seen are imperforate anus, congenital megacolon, biliary atresia and genitourinary abnormalities. It also shows a left sided ligamentum arteriosum connecting the left pulmonary artery to the descending aorta. Cardiac Catheterization and Angiography Although sparingly used now-a-days, this was a gold standard in past. The airway has two levels of bifurcations in the mediastinum, with a narrow intermediary segment, characteristic of congenital stenosis due to complete cartilaginous rings. The arrows indicate the narrowed vertical segment of the trachea between its upper and lower bifurcations. This anatomy can be appreciated when the pulmonary trunk is followed as it moves to the right side. Postoperatively, it is used to assess the tracheal surgery, cause of endotracheal tube bleeding, cause of prolonged ventilation etc. Furthermore, complications of the pulmonary parenchyma like collapseconsolidation, hyperinflation etc. The usual approach is through median sternotomy and after establishment of cardiopulmonary bypass. Bronchoscopy In many centers, a preoperative bronchoscopy is part of the investigational protocol. Often external imaging of the trachea may not show internal abnormalities like complete rings. Bronchoscopy informs us about the level, length and degree of luminal narrowing and allows precise surgical planning. The anticipated initial incision into the stenotic trachea is shown by dotted line. Courtesy: Reprinted with permission from reference 29 Postoperative Course the success of surgery depends not only on the vascular anastomosis made, but also on severity of preoperative airway obstruction. Persistent airway obstruction, hemorrhage, infections, edema and stenosis are usually seen in perioperative period. In severe cases, the airway symptoms may persist even 1 year after surgery due to pre-existing tracheomalacia. Rare postoperative complications include chylothorax and vocal cord palsy secondary to recurrent laryngeal nerve damage. The postoperative mortality rates are variable and mostly caused by associated tracheal and bronchial abnormalities. More long-term data is desirable, using objective quantification of respiratory function, before confirming the eventual curative nature of surgery. On cardiopulmonary bypass support, the trachea is patched with autologous fresh pericardium anchored with interrupted sutures. However, the symptoms are noted only if there is a coexisting crowded superior mediastinum, either secondary to cardiomegaly or dilated vessels, etc. In addition, the tracheobronchial tree is often inherently abnormal including abnormal branching pattern, abnormal alveolar architecture, etc. Surgical correction includes not only an intracardiac repair but also plication and anterior translocation of pulmonary arteries. Elongated Aortic Arch the classic example is right aortic arch in congenitally corrected transposition. Here, the ascending aorta is L-posed and ascends to the left and then takes a long transverse course in front of trachea to connect to the descending aorta in the right posterior mediastinum. Once the lungs are hyperinflated, they extend to the midline behind sternum, pushing the mediastinal structures and heart backward, further compromising the tracheal and bronchial patency. Posteriorly displaced Ascending Aorta In this situation, the displaced ascending aorta may directly compress on the right side of trachea. The compression is at the level of inlet of thoracic cage and is located at a much higher level than that caused by double aortic arch or right arch with aberrant left subclavian artery. The white arrow shows the brachiocephalic artery, the black arrow shows the trachea and the white overhead shows the esophagus. Vascular etiology of tracheoesophageal compressive syndromes account for 1 to 3 percent of all congenital heart diseases. Persistent respiratory and feeding difficulties may prove life threatening for small infants. Surgical treatment of anomalous vascular structures and tracheal reconstruction gives excellent results in most of the cases. This is not to be confused with double aortic arch, where the two arches are on the opposite sides of trachea. Shows the double-barreled aorta in which an aortic arch with dual lumen is found on the same side of trachea, in contrast to a double aortic arch. Note that the right arterial ductus has an ampullary dilatation (asterisk) at its pulmonary arterial end. I express my thanks to Dr Carl Backer for allowing us to reprint his schematic diagrams depicting principles of surgical treatment of pulmonary arterial sling. Last but not the least, I am thankful to Mrs Sindhu Vijayan for her secretarial help. In: Robert H Anderson, Edward J Baker, Daniel Penny, Andrew N Pedington, Michael L Rigby, Gil Wernovsky (Eds). Congenital Heart Surgery Nomenclature and Database Project: vascular rings, tracheal stenosis, pectus excavatum. Verlagerung des osophagus durch eine abnorm verlaufende arteria subclavia dextra (arteria lusoria). Mediastinal vascular anomalies causing tracheal and esophageal compression and obstruction in childhood.

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This cautions us to evaluate renal functions along with reduction in the dose of diuretics hiv infection rates with condom order famvir 250 mg without prescription. Evaluation of serum Na hiv ear infection purchase famvir from india, K antiviral uk release discount 250 mg famvir with visa, blood urea and creatinine and liver function tests would be useful in assessing diuretic response and its attendant complications hiv and hcv co infection symptoms buy famvir 250 mg on line. Serial measurement of fractional excretion of sodium is an objective measure of the effectiveness of the diuretic response hiv infection lymphocytes discount famvir online american express. This requires simultaneous estimation of serum and spot urinary sodium and creatinine concentrations. At the earliest suspicion of spontaneous bacterial peritonitis, an ascitic tap should be performed and antibiotic therapy instituted. Admitted patients are usually those who have resistant ascites or have developed diuretic induced Table 9. Nitric oxide synthase activity in the splanchnic vasculature of patients with cirrhosis: relationship with hemodynamic disturbances. Definition and diagnostic criteria of refractory ascites and hepato-renal syndrome in cirrhosis. Renalfunctionimpairment induced by change of posture in patients with cirrhosis and ascites. Clinical events after transjugular intrahepatic portosystemic shunt: correlation with hemodynamic findings. Low protein concentration ascitic fluid is predisposed to spontaneous bacterial peritonitis. The relation hip s of plasma volume, portal hypertension, ascites and renal sodium retention in cirrhosis: the overflow theory of ascites formation. Lack of increased bleeding after paracentesis and thoracocentesis in patients with mild coagulation abnormalities. Serum ascites albumin concentration gradient: A physiologic approach to the differentialdiagnosis. Superiority of the serumascites albumin difference over the ascites total protein concentration in separation of "Transudative" and Exudative" ascites. A comparison of paracentesis, and transjugular intrahepatic portosystemic shuntinginpatientswithascites. Textbook of Gastroenterology, 3rd edition Philadelphia, Pa: Lippincott WilliamsandWilkins;1999;966-91. Bed side inoculation of food culture bottles with ascitic fluid is superior to delayed inoculation in detection for spontaneous bacterialperitonitis. The serum ascites albumin gradient in the differential diagnosis of ascites is superior to the exudate/transudate concept. Abdominal tenderness in ascites patients indicates spontaneous bacterial peritonitis. Lymph imbalance in the genesis and perpetuation of the ascites syndrome in hepatic cirrhosis. Metabolic liver disorders now account for up to 40% of all chronic liver admissions to large medical centers in India. The possibility of a metabolic liver disease should be considered if any of the following are present: · Family history of liver disease or consanguinity · Unexplained hepatomegaly without jaundice · Any unexplained chronic liver disease · Associated rickets, failure to thrive and dysmorphism · Associated renal, respiratory or neurological disease · Recurrent episodes of liver disease · Liver failure in early infancy, severe uncorrectable coagulopathy. Wilson disease Wilson disease is an inborn error of metabolism characte rized by toxic accumulation of copper in liver, brain, cornea and other tissues. It is an autosomal recessive disorder and occurs worldwide with an estimated prevalence of 1 in 30­ 50,000. Management · diet: It is advisable to avoid high Cu containing foods like organ meats (liver), chocolates, nuts and dry fruits. Treatment comprises of an initial phase where Cu is reduced to subtoxic threshold. The manifestations are more likely to be hepatic in early childhood and neurological in ad olescents; however other forms of presentation are also seen. The spectrum of hepatic manifestations includes all forms of chronic or acute liver disease. In Indian children, neurological manifestations can begin even in the first decade. They can be equally varied and include clumsiness, speech difficulties, scholastic deterioration, behavior problems, choreoathetoid and dystonic movements. Other presentations are "osseo muscular" with bony deformities (knock knees) suggestive of 596 resistant rickets. Hemolytic anemia can occur due to eryth rocyte membrane injury from the free copper in the serum. Glycogen storage diseases Glycogen storage diseases are a heterogeneous group of entities classified on the basis of specific enzyme defects in various steps of glycogen synthesis or breakdown. Patients present in infancy with dolllike facies, truncal obesity, massive hepatomegaly, nephromegaly, failure to thrive, hypoglycemia and lactic acidosis after short fasting intervals. Galactose1phosphate uridyltransferase deficiency should be suspected in any of the following presentations in neonatal period: jaundice, hepatomegaly, hypoglycemia, cirrhosis, ascites, liver failure, coagulopathy, cataracts and Escherichia coli sepsis. If untreated, these children go onto develop liver failure or chronic liver disease. The laboratory findings besides those of deranged liver function include elevated blood galactose and galactose1 phosphate, hypoglycemia, hyperglycosuria, hyperchloremic metabolic acidosis, albuminuria and hyperaminoaciduria. In neonates and small infants, the preparation used is lactosefree casein hydrolysates or soya bean milks. Glycogen storage disease Type iv this rare disorder occurs due to a defect in glycogen branching enzyme. Cirrhosis and splenomegaly soon become manifest and death from liver cell failure usually occur before 3 years of age. The disorders are fairly benign and longterm outlook for growth and liver function are good. Galactosemia It is an autosomal recessive disorder of galactose metabolism due to deficiency of enzymes galactokinase and Galactose 597 vip. Pancreatitis, although is relatively uncommon during childhood, there is a significant morbidity and mortality associated with it. Mild acute pancreatitis is the term reserved for pancreatitis with minimal or no organ dysfunction whereas severe pancreatitis should be considered if there is evidence of life-threatening complications such as organ failure (shock, pulmonary insufficiency and renal failure) or local complications like necrosis, abscess or pseudocyst. The incidence of pancreatic pseudocysts is greater than 50% when associated with traumatic injury to the abdomen. At each step of their formation and secretion the enzymes are totally sequestrated in a membrane-bound space. The various potent inhibitors of proteolytic enzymes present in many body fluids, and tissues constitute a second line of protection, defending the organism against inappropriate activation of the digestive proenzymes of the pancreas. Till now, the exact mechanisms of the development of acute pancreatitis are a matter of debate. The most common and widely accepted theory is that pancreatitis develops because of an injury to the pancreatic acini or disruption of the pancreatic duct, which permits the leakage of pancreatic enzymes (trypsin, chymotrypsin and elastase) into pancreatic tissue. The leaked enzymes become activated in the tissue, initiating autodigestion and acute pancreatitis. The activated proteases (trypsin and elastase) and lipase break down tissue and cell membranes, causing edema, vascular damage, hemorrhage, ischemia inflammation and necrosis with release of toxic factors in both pancreatic and peripancreatic tissues leading to systemic effects such as multiorgan failure (Flow chart 9. It is characteristically a sharp and steady epigastric pain of sudden onset, commonly aggravated by eating and improved by drawing the knees up to the chest. Radiation of pain to the back or pain in other sites of abdomen is rare in children unlike adults. The pain increases in intensity over 24­48 hours and the patient may require hospitalization. On physical examination, the child usually appears anxious and uncomfortable, particularly with any movement. Tachycardia and fever are common; diffuse abdominal tenderness, more marked in the upper abdomen, and quiet bowel sounds are the rule. However, the diagnosis is not always obvious, and the symptoms can easily be attributed to other acute abdominal emergencies. In this life threatening condition the patient may be acutely ill with severe abdominal pain and vomiting progressing to etiology the causes of pancreatitis are as diverse or even more in children compared to adults as shown in the Table 9. Drugs and blunt trauma were the leading causes for acute pancreatitis in children followed by gallstone disease, tuberculosis, mumps, viral hepatitis and hypertriglyceridemia and hereditary, according to one Indian study and the cause was not known in 35% of cases according to this study. Screening of family for hereditary or metabolic disorders associated with pancreatitis will help. White blood cell counts may be increased with increased band counts and these findings do not imply infection always. An increased hematocrit secondary to hemoconcentration, secondary to volume depletion may be found. Also, 15% of children with pancreatitis develop hypocalcemia, and up to 25% have hyperglycemia during the acute attack. Blood urea nitrogen may be increased due to prerenal azotemia or acute renal injury, metabolic acidosis due to circulatory failure and hypoxemia due to respiratory insufficiency. The serum amylase concentration is elevated in at least 75% of cases of acute pancreatitis on the initial day of symptoms and remains elevated in most patients for 5­10 days. Protracted elevations of serum amylase are suggestive of pseudocyst or other complications of pancreatitis. The serum lipase level is also usually elevated in acute pancreatitis, and serum lipase measurement is preferable to serum amylase because of its equal sensitivity and greater specificity because almost all lipase originates from the pancreas. Urinary lipase levels may remain elevated for a few days longer than serum levels. Additional tests, which have been used in the diagnosis of acute pancreatitis include immunoreactive trypsinogen, elastase, ribonuclease and phospolipase A, but no particular advantage. Levels of cationic trypsin are said to be a more sensitive early marker of pancreatic inflammation. The fluid collections most commonly are found in the peripancreatic and anterior pararenal spaces but can extend from the mediastinum down to the pelvis. An enlarged, edematous-appearing pancreas usually suggests pancreatitis on ultrasound but the pancreas may appear completely normal in mild cases of acute pancreatitis. Angiography is primarily used to help diagnose the vascular complications of acute pancreatitis. Fluid administration must be sufficient to replace "third spacing" and to maintain good urine output. Pain control Meperidine (Demerol) is preferred to morphine for pain control because it is less likely to cause spasm of the sphincter of Oddi, which can worsen the pancreatitis. Antibiotics are generally unnecessary, even in the presence of elevated white blood cell counts and fever; they should be used only 601 when infection is strongly suspected. Fluid resuscitation helps to prevent hypotension and renal insufficiency, crystalloids may suffice but colloids may be necessary if there is hypoalbuminemia consequent to protein loss into the peritoneum. Cardiorespiratory monitoring is necessary to prevent hypoxemia, adult respiratory syndrome and cardiac complications like heart failure, myocardial infarction, cardiac arrhythmia and shock. Surgical intervention is only needed if the symptoms are severe and prolonged or complicated by necrosis or abscess formation that requires debridement. Peritoneal lavage has been used in adults in an effort to reduce the incidence of secondary infection; however, this has not been through trials with children to test its efficacy. If underlying pancreaticobiliary disease is present, surgical intervention is required for cure. Acute pancreatic pseudocysts, which are smaller than 5 cm in diameter, are managed with observation for 4­6 weeks. Pancreatic pseudocysts larger than 5 cm in diameter may require surgical intervention. Diagnosis of the specific cause of pancreatitis is important to elucidate as there is a 9% recurrence rate, most of which are diagnosed with idiopathic recurrent pancreatitis or structural anomalies. It causes exocrine and endocrine insufficiency eventually resulting in malabsorption of dietary nutrients, malnutrition, diabetes and severe unrelenting abdominal pain. Two forms are recognized: (1) a large-duct calcifying type and (2) a small-duct variant. With time the secretory parenchyma is destroyed and replaced by fibrous tissue leading to malnutrition and diabetes. Pancreatitis in children is being increasingly recognized particularly in patients with multisystem disease. In adults the most common causes of pancreatitis are alcohol and biliary tract disease. Although most published pediatric series contain relatively few patients, it is clear that the etiologies of pancreatitis are quite varied in childhood. Except for patients with cystic fibrosis, hereditary pancreatitis, and pancreatitis secondary to congenital malformations, few cases progress to chronicity. Tropical calcific pancreatitis is a juvenile form of chronic calcific, nonalcoholic pancreatitis, prevalent almost exclusively in the developing countries of the tropical world. Some of its distinctive features are younger onset, presence of large intraductal calculi, exocrine insufficiency, high prevalence of diabetes, accelerated course of the disease and high susceptibility to pancreatic cancer. As described before in the hereditary pancreatitis, the activation of trypsinogen to trypsin was shown to play a key role in the pathogenesis. In addition, various sites of trypsinogen, serine protease 1 mutations have been reported. The serine protease inhibitor Kazal type 1 secreted from pancreatic acinar cells into the pancreatic juice, is a potent trypsin inhibitor that prevents the trypsin-catalyzed premature activation of zymogens in the pancreas and pancreatic duct. Cystic fibrosis transmembrane conductance regulator gene, which is also known as another causative gene in chronic pancreatitis, should also be looked though the incidence should be very low in Indian children. Alpha 1-antitrypsin is of particular interest because it may prevent pancreatic autodigestion by inhibiting protease activity.

It consists of a network of capillaries supplied by the afferent arteriole and drained by the efferent arteriole antiviral in pregnancy cheap famvir online. The endothelial cells of the glomerular capillaries are covered by a basement membrane hiv infection new york order famvir 250 mg without prescription, which is surrounded by podocytes hiv infection rate condom generic 250 mg famvir visa. The capillary endothelium antiviral coconut oil buy on line famvir, basement membrane and foot processes of podocytes form the filtration barrier antiviral research abbreviation order 250 mg famvir fast delivery. The endothelium is fenestrated and is freely permeable to water, small solutes and most proteins but impermeable to cellular components. These cells synthesize several vasoactive substances, angiotensin, prostaglandins, nitric acid, endothelin1, bradykinins and glucocorticoids that are important in controlling renal flow. The basement Nervous System Sympathetic fibers originating in the lower splanchnic nerves travel through the lumbar ganglion to the kidney. Stimulation of the sympathetic nervous system reduces renal blood flow by causing intrarenal vasoconstriction. It also stimulates the local reninangiotensin aldosterone system and enhances sodium reabsorption. The podocytes have long fingerlike foot processes that interdigitate to cover the basement membrane and are separated by apparent gaps called filtration slits. These filtration slits function primarily as a size selective filter that retards the filtration of proteins and macromolecules. The proximal tubule initially forms several coils, followed by a straight piece that descends toward the medulla. The loop of Henle is composed of the straight part of the proximal tubule, a descending thin limb, which ends in a hairpin turn, an ascending thin limb and a thick ascending limb. The juxtaglomerular apparatus is located at the end of the ascending limb where the nephron passes between the afferent and the efferent arterioles of the same nephron. This consists of an area of thickened epithelial cells of the afferent arteriole, the granular cells, an area of specialized cells lining the wall of the distal tubule, the macula densa cells and the extraglomerular mesangial cells. The juxtaglomerular apparatus activates the reninangiotensin aldosterone axis and participates in sodium conservation. The distal tubules of two or more nephrons join to form a cortical collecting duct, which continues as the medullary collecting duct. Numerous collecting ducts join and open through the ducts of Bellini into a minor calyx at the papillary tip of the pyramid. The filtrate produced by the glomerulus enters the tubule where reabsorption and secretion of fluid and electrolytes adjust the urinary composition to maintain homeostasis of body fluids. The processes of reabsorption of solutes and water from the tubular lumen across the tubular cell membrane to the peritubular capillary blood and secretion into tubular fluid are mediated by diffusion, channels or specialized membrane carrier proteins called "transporters". The passive transporters are Na+/K+/ Cl and Na+ glucose cotransporters and Ca2+/Na+ and H+/ Na+ exchanger. Almost all cells in the nephron have a single nonmotile primary cilium that protrudes into the tubular lumen. These cilia function as mechanosensors, sensing changes in flow rate of the tubule fluid, and chemosensors, sensing or responding to compounds in the surrounding fluids to initiate calcium dependent signaling pathways including those that control nephron function, proliferation, differen tiation and apoptosis. These nephrons have short loops of Henle, and have efferent arterioles that branch into peritubular capillaries surrounding adjacent nephrons in addition to their own segments. This capillary network provides a pathway for the return of reabsorbed water and solutes to the circulatory system. Inset shows electron microscopic presentation of glomerular capillary wall showing the components of the filtration barrier vip. Their efferent arterioles form a network of peritubular capillaries as well as several vascular loops called the vasa recta deep in the medulla. Other clinical features are subtle or vague and do not lead to a suspicion of an underlying renal disorder. Kidney diseases should be considered in children with failure to thrive, unexplained fever, obscure anemia, rickets and dyselectrolytemia and acid base abnormalities. Polyuria Urine outputs in excess of 4­6 mL/kg/day reflect impaired urinary concentration. Impaired distal concentration due to vasopressin deficiency (central diabetes insipidus) or lack of tubular response to vasopressin (nephrogenic diabetes insipidus) will lead to profound water losses. Distal tubular dysfunction may result from obstructive uropathy, chronic hypokalemia or interstitial nephritis. Polyuria and polydipsia are important features of nephronophthisis, a familial nephropathy that manifests during infancy. Hematuria Urine color may vary from frank red to shades of brown, described as cola or tea colored. A small amount of blood (1 mL in 1 L of urine) is sufficient to make urine appear red. Concentrated urine looks like mustard oil, and is often mistakenly reported as hematuria. Myoglobinuria, porphyria or alkaptonuria may cause brown discoloration of urine, while administration of rifampicin and pyridium and ingestion of sugar beet or red dyes impart a reddish orange color. Hematuria should be confirmed by micro scopy, and is differentiated from hemoglobinuria and methemoglobinuria. Important causes of hematuria and steps of evaluation are listed in Chapter "Asymptomatic Hematuria". Nephrotic syndrome characteristically manifests with gradually increasing periorbital edema, which is often mistakenly attributed to an allergic or eye problem. Nephrotic syndrome is easily differentiated from other causes of edema such as congestive cardiac failure and cirrhosis of liver. Ultrasonography is a useful tool for evaluation of the anatomy of kidneys and urinary tract. Distal obstruction, most commonly from posterior urethral valve, should be excluded in male infants. Voiding problems during daytime, such as urgency, frequency or holding maneuvers, suggest an underlying bladder dysfunction. Detailed history and examination including neurological evaluation (anal tone, sensory loss over the perineum) are carried out. Anuria may result from severe dehydration and hypovolemia, complete obstruction of the urinary tract or profound renal parenchymal injury. The presence of these abnormalities should be confirmed on repeated, careful urine examination. Isolated microscopic hematuria is most commonly due to idiopathic hypercalciuria (defined as random urine calcium: creatinine ratio of > 0. Transient, mild proteinuria may be observed during fever following exercise, and during infections. Persistent proteinuria is most commonly due to renal disease and should always be investigated to find the cause. Phase contrast microscopy is helpful to examine red cell morphology, casts and crystals. Timed Urine collection Because of difficulties in accurately collecting all specimens of urine, 12hour or 24hour collections are undertaken when definitely needed. Presence of palpable kidney(s) may suggest multicystic dysplastic kidney, poly cystic kidney disease, pelviureteric junction obstruction or Wilms tumor. Factors that reduce renal perfusion can cause a reversible increase in blood urea levels. The levels are also increased in excessive tissue breakdown, trauma, gastrointestinal bleeding and use of corticosteroids and tetracycline. Hyperbilirubinemia (bilirubin level > 5 mg/dL) interferes with the measurement of creatinine. Glomerular filtration rate may be estimated in children as follows: Glomerular filtration rate = k × height (in cm) Serum creatinine (mg/dL) Laboratory evaluation Urinalysis A detailed examination of urine is crucial in the evaluation of renal disease. The first morning specimen is more concentrated and preferred since formed elements lyse quickly in dilute urine. A midstream specimen can be obtained in older children, but in neonates and infants, transurethral catheterization or suprapubic bladder puncture may be carried out. Examination of urine specific gravity aids the evaluation for polyuria while the measurement of urine pH assists in determining tubular acidification abnormalities. Proteinuria Urine protein is estimated with heat precipitation or sulfosalicylic acid as turbidity that is graded from trace, 1+ to 4+. Dipstick testing is more convenient and is graded similarly (trace: 15 mg/dL; 1+: 30 mg/dL; 2+:100 g/dL; 3+:300 mg/dL; 4+:2 g/dL). Normal children excrete less than 100 mg/m2/day of protein in urine, which is chiefly tubular TammHorsfall protein. Since collection of 24hour urine specimens is often difficult, the ratio of protein to creatinine in a random sample can be used. Serum albumin is reduced in patients with nephrotic syndrome proteinuria, occasionally below 1. Tests of Tubular function Testing for specific tubular function is indicated by clinical features. For example, children with polyuria may require water deprivation testing and vasopressin administration, and bicarbonate or ammonium chloride loading tests are performed in those with impaired urinary acidification. The test is avoided in neonates since urinary concentration of the contrast is inadequate. Following urinary catheterization, radiocontrast agent is introduced into the bladder; films are taken while the child is voiding. Oral amoxicillin or parenteral gentamicin (administered 30­60 minutes prior to the procedure and 6 hours afterward) may be administered prophylactically. It is especially suited for children since it is painless, requires no sedation or radiocontrast administration, and can be repeated safely. Ultrasound is useful in guiding procedures such as renal biopsy or fine needle aspiration. The major limitation of ultrasonography is that it is operator dependent; interpretation in children requires considerable experience. The renal cortical echotexture is compared with liver, spleen and renal medulla; nonspecific changes may occur with renal parenchymal disease. Plain x-ray of the abdomen A plain radiograph has limited utility, chiefly in detecting small renal calculi and ureteric calculi without proximal ureteral dilatation. Radiographs also assist in the evaluation of the spine in children with neurogenic bladder, assess ment for changes of renal osteodystrophy and screening for metastatic bone disease. Particular attention is di rected toward the amount of amniotic fluid, anteroposterior diameter of renal pelvis and pelviectasis, renal echotexture, appearance of the ureters and urinary bladder. Distended bladder with bilateral hydronephrosis suggests distal ob struction as seen with posterior urethral valves, while uni lateral hydronephrosis with normal ureters and bladder suggests pelviureteric junction obstruction. Disadvantages include radiation exposure, the need for sedation and risks of contrast nephropathy. The use of gadoliniumbased contrast in patients with impaired renal function carries the risk of nephrogenic systemic fibrosis. The peak of the curve depends on renal blood flow, renal function, tubular transit and excretion. Therefore, the peak is delayed in renal artery stenosis, renal parenchymal disease, oliguria and with obstruction. Dynamic scans are useful in identification of pelviureteric junction obstruction and renovascular stenosis, evaluation of differential and total renal function, assessment of allograft function and perfusion. A diuretic renogram helps differentiate obstructive dilatation of the upper urinary tract from nonobstructive hydronephrosis; in the latter, the radionuclide clears promptly following the injection of frusemide. They are used to assess differential renal function and renal perfusion, and to identify cortical scars, intrarenal masses and upper tract dilatation. Note the three phases: (i) a rapid rise and fall due to first pass perfusion; (ii) slow rise to a peak due to arrival of the agent into the kidney and (iii) declining amplitude due to excretion. It is performed by instilling radionuclide through a urethral catheter or by its injection into the bladder. Thereafter, rapid sequence images of the bladder are obtained while the patient voids. These provide a visual representation of the rate of bladder emptying, residual urine volume and evidence of reflux. The availability of disposable automatic devices (biopsy gun) and ultrasonographic guidance have improved the yield of the procedure, with relatively less risks. Prior to biopsy, a normal coagulation profile and normal blood pressure must be ensured to reduce the risk of bleeding. Patients with marked azotemia should be dialyzed and receive intranasal desmopressin 30­60 minutes prior to the procedure. The procedure is performed on an empty stomach (4hour fasting) under light sedation using intravenous midazolam with ketamine; atropine administration reduces the risk of secretions. The child lies in the prone position with a folded towel or bedsheet placed under his lower ribs and epigastrium to push the kidney posteriorly and stabilize its position. The biopsy site is the angle made by the lower edge of the 12th rib and the lateral border of sacrospinalis. The kidney is localized with a "probing" 23gauge needle or visualized directly by ultrasound. The entry of the biopsy needle into the kidney when it pierces the renal capsule is indicated by slight resistance. Complications include local pain, gross hematuria, perinephric hematoma, infection, and rarely, formation of traumatic arteriovenous fistula. Severe structural fetal anomalies occur in 1% of pregnancies and defects of renal development might account for 30% of chronic kidney failure in children. The development of kidneys begins at the fifth week of gestation from the intermediate mesoderm which differentiates into pronephros, mesonephros and metanephros.

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