Homer A. Boushey MD

• Chief, Asthma Clinical Research Center and Division of Allergy & Immunology
• Professor of Medicine, Department of Medicine, University of California, San Francisco

https://www.ucsfhealth.org/homer.boushey

The effect of thickened-feed interventions on gastroesophageal reflux in infants: systematic review and meta-analysis of randomized erectile dysfunction latest treatment buy kamagra super on line amex, controlled trials erectile dysfunction without pills purchase kamagra super overnight. Evaluation of infantile acid and nonacid gastroesophageal reflux using combined pH monitoring and impedance measurement erectile dysfunction and diabetes pdf buy kamagra super 160 mg overnight delivery. Association of H2-blocker therapy and higher incidence of necrotizing enterocolitis in very low birth weight infants impotence versus erectile dysfunction cheap kamagra super express. Gastric colonization and pneumonia in intubated critically ill patients receiving stress ulcer prophylaxis: a randomized erectile dysfunction desi treatment buy discount kamagra super 160 mg, controlled trial. Occurrence of ventilatorassociated pneumonia in mechanically ventilated pediatric intensive care patients during stress ulcer prophylaxis with sucralfate, ranitidine, and omeprazole. Nosocomial pneumonia risk and stress ulcer prophylaxis: a comparison of pantoprazole vs ranitidine in cardiothoracic surgery patients. Do proton-pump inhibitors increase the risk for nosocomial pneumonia in a medical intensive care unit Clinical analysis of patients requiring long-term mechanical ventilation of over three months: ventilatorassociated pneumonia as a primary complication. A comparison of sucralfate and ranitidine for the prevention of upper gastrointestinal bleeding in 1377 39. Therapy with gastric acidity inhibitors increases the risk of acute gastroenteritis and community-acquired pneumonia in children. Famotidine for infant gastro-oesophageal reflux: a multi-centre, randomized, placebo-controlled, withdrawal trial. Efficacy of protonpump inhibitors in children with gastroesophageal reflux disease: a systematic review. Iatrogenic gastric acid suppression and the risk of nosocomial Clostridium difficile infection. Metoclopramide for the treatment of gastroesophageal reflux disease in infants: a systematic review. Erythromycin mimics exogenous motilin in gastrointestinal contractile activity in the dog. Gastrointestinal motorstimulating activity of macrolide antibiotics and analysis of their side effects on the canine gut. Erythromycin for the prevention and treatment of feeding intolerance in preterm infants. Establishing enteral feeding in preterm infants with feeding intolerance: a randomized controlled study of low-dose erythromycin. Use of oral erythromycin for the treatment of gastrointestinal dysmotility in preterm infants. Preventive antireflux surgery in neonates with congenital diaphragmatic hernia: a single-blinded prospective study. Postoperative lower esophageal dilation in children following the performance of Nissen fundoplication. This chapter focuses on the approach to infants with protracted diarrhea and is a review of recent literature on infantile diarrheal illnesses. Intractable diarrhea is a term coined many years ago by Avery to describe chronic, unexplained diarrhea in young children. Protracted diarrhea has been used more recently to describe infants with loose and frequent stools of sufficient severity to require nutritional support in the form of parenteral alimentation. This emphasis on adequate support of total caloric intake and nutritional rehabilitation has dramatically improved the survival of affected infants. Diarrhea is classified as either secretory or osmotic; however, in several cases both mechanisms may be involved. Secretory diarrhea is the result of either impaired absorption of NaCl from villous enterocytes or increased chloride secretion from crypt cells, secondary to exogenous toxins from bacteria or viruses or endogenous substances (hormones, neurotransmitters, or cytokines), or from inherent defects in the sodium or chloride channels. The secretory diarrhea usually presents as a large volume of watery stools and does not improve with fasting. Osmotic diarrhea results from nonabsorbable substances in the intestinal lumen, which increases the osmolality of the luminal contents. This results in either retention of fluid or secretion of fluid into the intestinal lumen, therefore leading to diarrhea. In contrast to secretory diarrhea, typically osmotic diarrhea improves with fasting. Osmotic diarrhea can be distinguished from secretory diarrhea by measuring the electrolyte concentration in the stool and the osmotic gap. In osmotic diarrhea, there is a significant osmotic gap (>50 mOsm/kg) between the stool osmolality and twice the concentrations of sodium and potassium in the stool (Table 92-1). However, in clinical practice, usually the diagnosis is made by a trial of fasting to determine if there is improvement in the stool output. Some diarrheal disorders may have a secretory and osmotic component, as is sometimes seen in celiac disease. Although diarrhea alone may be responsible for an increase in fat excretion of up to 11 g per day (normally, <7 g fat/day is excreted by persons consuming 100 g fat/day), when larger amounts of fat are found in the stool the patient should be evaluated for a disorder of fat absorption. Based on the description of diarrhea as osmotic or secretory or mixed osmotic and secretory components, infantile diarrheal etiologies can be distinguished, as shown in Box 92-1. Disorders of Carbohydrate Absorption the enterocytes in the small intestine have at their apical surface brush border various enzymes responsible for the digestion of carbohydrates. Patients with carbohydrate malabsorption disorders, regardless of the cause, present with severe watery diarrhea, which results from osmotic action exerted by the malabsorbed oligosaccharide4 (lactose, sucrose, or glucose) in the intestinal lumen. The malabsorbed sugars are then fermented by colonic bacteria, producing a mixture of gases. Congenital sucrase-isomaltase deficiency is caused by reduced activity of the brush border enzyme sucrase-isomaltase. Patients present with diarrhea, usually noticed around the age of 3 to 6 months when the infant is weaned from breast milk to baby foods that contain sucrose. Affected infants present with severe, chronic or intermittent watery diarrhea, abdominal distention, cramping, metabolic acidosis, and failure to thrive. A detailed history will provide the correlation of the onset of diarrhea and the dietary changes. Stool osmolality reveals an elevated osmolar gap (>50 mOsm), indicating the presence of malabsorbed sugars. Sucrose hydrogen breath testing13 is a noninvasive test to evaluate for sucrase-isomaltase deficiency, but is not specific for a congenital deficiency and will be abnormal also if there is mucosal injury and secondary disaccharidase deficiency. Congenital lactase deficiency can be diagnosed by obtaining a good dietary history and can be demonstrated by a lack of increase in blood sugar after a load of lactose. When treated appropriately the patients have good catch-up growth with normal psychomotor development. Maltase-glucoamylase is very similar to sucrase-isomaltase (59% homology), and has two catalytic sites that are identical to those of sucraseisomaltase. The clinical symptoms are very similar to other disaccharidase deficiencies with diarrhea, abdominal distention, and bloating. Endoscopy with biopsies will show decreased levels of the enzyme when symptomatic treatment requires starch elimination from the diet. The babies usually present very soon after birth with watery diarrhea, vomiting, poor weight gain, lactosuria, aminoaciduria, and changes in the nervous system. Congenital lactase deficiency is caused by the deficiency of lactase, in the small intestine and has been linked to chromosome 2q21. Usually, congenital lactase deficiency is an isolated deficiency, but Nichols and co-workers have reported it in association with other disaccharidase deficiencies such as maltase-glucoamylase. Breast milk and other commercial formulas have lactose; therefore, the onset is usually within the first 10 days of life. The diarrhea resolves after switching to a lactose-free formula,9 which confirms the diagnosis. Apart from diarrhea, these babies are lively and have a good appetite; they exhibit poor weight gain but no vomiting. Infants present in the neonatal period with severe watery diarrhea, which can lead to rapid dehydration and death. These infants present at the start of breastfeeding or ingestion of glucose-containing formula with severe watery diarrhea that often can be confused with urine. The predominant sugar of breast milk is lactose, which is hydrolyzed to glucose and galactose before being absorbed. As with congenital lactase deficiency, hypercalcemia resolves after initiation of a glucose-free diet and control of diarrhea. The diagnosis is made by the onset of diarrhea after the introduction of glucose, the presence of glucose in stools, hypoglycemia, hypernatremic dehydration, and normal intestinal morphology. The diarrhea improves on elimination of glucose, galactose, and lactose from the diet. In the terminal ileum the bile salts are bound with ileal bile acid binding protein. When any of these steps is disrupted, it will result in fat malabsorption and consequently, diarrhea. Stool fecal elastase is a great marker highly sensitive and specific for pancreatic insufficiency. This disorder can present very early in life with meconium ileus, which is an obstruction of the ileum as a result of thick meconium plugs. Infants produce limited amounts of pancreatic lipase and only reach adult levels by 2 years of age;29 therefore, infants rely on gastric lipase for fat digestion. Bile salt stabilization of fatty acids and monoglycerides to form micelles, which in turn stabilize cholesterols, diglycerides, and fat-soluble vitamins. If the pregnancy is not terminated, then the diagnosis should be confirmed by sweat testing after birth. Patients present with failure to thrive in infancy secondary to exocrine pancreatic insufficiency and variable degrees of bone marrow failure. The first criterion is demonstration of a hematologic cytopenia, which includes any of the three cell lines. Affected infants have characteristic phenotypic features, including aplastic alae nasi (which gives the appearance of a beaklike nose with large nostrils),60 extension of the hairline to the forehead with upswept frontal hair,61 low-set ears, large anterior fontanelle, micrognathia, thin lips, microcephaly,62 aplasia cutis (patchy distribution of hair with areas of alopecia), dental anomalies, poor growth, pancreatic exocrine aplasia, and anorectal anomalies (mainly imperforate anus). It was described by many groups, including Nezelof and Watchi (1961),48 Bodian and colleagues in the United Kingdom (1964),49 Burke and co-workers in Australia (1967),50 and Shwachman in the United States (1964). Patients present with exocrine pancreatic insufficiency with poor weight gain, failure to thrive, hypoalbuminemia, edema, and anemia. The results are expressed as a percent retention, with retention of less than 10% after 7 days having a sensitivity of up to 100% and specificity of up to 94% for primary bile acid malabsorption. Familial pancreatitis with mutations in the trypsinogen gene can cause chronic pancreatitis, pancreatic insufficiency, and chronic diarrhea. Microscopic examination of small intestine biopsies showed variable degrees of dilation of the lymph vessels in the mucosa and submucosa. Intestinal lymphangiectasia is responsible for lymph leakage into the bowel lumen, which leads to hypoalbuminemia, hypogammaglobulinemia, and lymphopenia. The edema that accompanies the disease is the consequence of hypoproteinemia with decreased oncotic pressure. The main symptom is a variable degree of peripheral edema, usually symmetric, that may range from moderate when limited to lower limb edema to severe when it includes the face and external genitalia. These children complain of fatigue, abdominal pain, weight loss or inability to gain weight, moderate diarrhea, and fat-soluble vitamin deficiencies caused by malabsorption. The diagnosis of primary intestinal lymphangiectasia is made by the combination of elevated fecal alpha-1 antitrypsin levels and endoscopic evidence of intestinal lymphangiectasia. These disorders should be considered when the more common causes of chronic diarrhea have been ruled out. Bile acid diarrhea happens when there is disease or resection of the terminal ileum as well as congenital conditions affecting the terminal ileum, which disrupt the enterohepatic circulation. When this factor is decreased, then the excessive bile acid leads to diarrheal fat malabsorption and secretion of fluids from the colonocytes secondary to bile acid stimulation. The diarrhea is exacerbated when dietary fats are added and often persists during fasting. Mediumchain triglycerides can be added to the diet because they are absorbed directly into the portal venous circulation, avoiding lacteal engorgement and improving nutrition and caloric intake. Other treatments, such as antiplasmin, octreotide, and corticosteroid administration, have been tried with inconsistent results. The disease is characterized by hypocholesterolemia, fat malabsorption, and failure to thrive, with onset of the diarrhea shortly after birth. These children may have vomiting, abdominal distention, and less often, hepatomegaly. Later in life, many of the symptoms are secondary to the deficiency of fat-soluble vitamins such as development of atypical retinitis pigmentosa, coagulopathy, posterior column neuropathy, and myopathy. Diagnosis of abetalipoproteinemia and homozygous hypobetalipoproteinemia is made through low triglyceride and cholesterol levels. Endoscopic evaluation may reveal a yellow appearance of the small bowel, and pathology is significant for fat-laden enterocytes. The diagnosis can be confirmed by switching the diet from an intact-proteinased formula to a proteinhydrolysate formula. Chylomicron retention disease, also known as Anderson disease,4 is a rare autosomal recessive disorder of lipoprotein assembly. The diagnosis can be made by quantifying the enteropeptidase on small intestinal biopsies or by assaying the enzyme levels in the duodenal fluid. Congenital disorders of glycosylation are caused by defects in protein N-glycosylation, and are associated with mental and psychomotor retardation, sometimes with coagulopathy, hypoglycemia, and liver fibrosis without neurologic involvement. Both entities can present with polyhydramnios, suggesting that both conditions may start before delivery. Because of the degree of stool output and dehydration, both entities can renal disease. Both are secretory diarrheas with severe electrolyte imbalance, although the electrolyte losses and serum electrolyte disturbances are different. It is usually described in children with cystic fibrosis who have pancreatic exocrine deficiency.

Peppermint oil erectile dysfunction treatment penile prosthesis surgery kamagra super 160 mg purchase without a prescription, administered in pH-dependent erectile dysfunction ring discount 160 mg kamagra super with mastercard, enteric-coated capsules has been shown to reduce abdominal pain severity over placebo in both adults and children erectile dysfunction homeopathic kamagra super 160 mg purchase otc. Melatonin is likely to be effective in less severe patients with functional pain with minimal co-morbidities and has the added benefit of having a low side effect profile erectile dysfunction jelly generic 160 mg kamagra super otc. The combination consists of liquid extracts from chamomile flowers erectile dysfunction and diabetic neuropathy generic 160 mg kamagra super overnight delivery, bitter candytuft, angelica root, caraway fruits, milk thistle, lemon balm leaves, greater celandine, licorice root, and peppermint leaves. The child with functional pain may improve once the child and the family understand the nature of the pain and a proper explanation is given by the provider. Knowing that there is no serious organic disease and that the sensations are not imaginary is usually welcome information to the family. However, the conversation about functional abdominal pain should be brought up during the first visit and should not be discussed only after doing extensive testing. The family should understand that testing is only to confirm the absence of other disorders and confirm the possibility of functional pain. Some patients have minimal severity and frequency of pain while others have daily, unremitting pain that results in school absences, functional disability, and diminished quality of life. The total number of days missed from school is a good indicator of disability and should always be asked during the visit. For those with mild symptoms not interfering with daily activities, simple treatment strategies such as stool softeners for constipation often provide sufficient relief, such that the child can resume a more normal life. Similarly, dietary manipulation with lactose or fructose avoidance is often an important first step in the child with mild, chronic abdominal pain. Carbohydrate malabsorption or intolerance from lactose, sorbitol, or high-fructose corn syrup (fruit juices and sodas) may produce pain that responds to dietary elimination of the offending sugar. These simple strategies should not be tried on the child with significant disability and school absences, mainly because they are unlikely to work and time would be lost in trying to get the child back to functioning. The clinician should refrain from talking to patients and family using negative comments such as "you will have to learn to live with this pain. Sometimes, despite diligent evaluation by the most skilled and patient clinician, symptoms can persist. Food and Drug Administration­approved drugs for the treatment of chronic abdominal pain in children and little evidence of efficacy for most commonly used medications. It is important to consider that the clinician must spend time educating the family regarding the suspected mechanisms and how and why pharmacotherapy may or may not work. In the more severe, disabled patients, patient education should be considered part of a therapeutic program that includes physical reconditioning, exercise, sleep restoration and in many cases, thought reprocessing. Psychologic therapies such as cognitive behavioral therapy, hypnosis, relaxation, meditation, or biofeedback have been shown to be as effective, and sometimes better than pharmacologic therapy. Families should always be educated on the potential modification, of the "pain behavior" and potential benefits of lifestyle modifications. A therapeutic trial with medications should be discussed with the family and should have a well-defined duration and goals. If history and physical examination suggest dyspepsia or epigastric pain without red flags, a trial of acid suppression is very appropriate as an initial step. Similarly, if the history and physical examination suggest constipation as the cause for pain, then the proper therapy with osmotic laxatives or cathartics should be initiated. Biochemical analysis that raises suspicion for organic disorders include iron deficiency anemia, high sedimentation rate or C-reactive protein, hypoalbuminemia, and abnormal liver or kidney function tests, or elevated amylase and lipase. A high stool calprotectin level suggests an inflammatory process and should 181 be obtained in the presence of diarrhea. An abdominal ultrasound should also be considered in order to investigate the possibility of gallstones, pseudocyst, ureteropelvic junction obstruction, or a retroperitoneal mass. Diagnosis of right lower quadrant pain and suspected acute appendicitis ­ Executive Summary. Duodenal ulcer healing by eradication of Helicobacter pylori without anti-acid treatment: Randomised controlled trial. Role of Helicobacter pylori infection and non-steroidal anti-inflammatory drugs in peptic-ulcer disease: A meta-analysis. Leukocyte counts in the diagnosis and prognosis of acute appendicitis in children. Computed tomography and ultrasonography do not improve and may delay the diagnosis and treatment of acute appendicitis. Ureteropelvic junction obstruction presenting with recurrent abdominal pain: Diagnosis by ultrasound. Short and long term mortality associated with foodborne bacterial gastrointestinal infections: Registry based study. Mesenteric lymphadenopathy as a cause of abdominal pain in children with lobar or segmental pneumonia. Serial computed tomography is rarely necessary in patients with acute pancreatitis: A prospective study in 102 patients. Cholecystectomy versus cholecystolithotomy for cholelithiasis in childhood: Long-term outcome. Chronic duodenal ulcer in children: Clinical observation and response to treatment. Peptic ulcer disease in children: Etiology, clinical findings, and clinical course. Recurrent abdominal pain in school children: the loneliness of the long distance physician. Choledochal cyst: Survey by the surgical section of the American Academy of Pediatrics. Functionally, diarrhea should be considered if a patient is passing 3 or more unusually loose stools in a 24-hour period or is passing stools more frequently than usual, with a consistency looser than what is considered normal for that individual. Diarrhea is further classified by pathophysiology, which typically involves 1 or more of the following mechanisms: (1) osmotic diarrhea, characterized by the presence of an increased intraluminal osmotic load leading to passive diffusion of fluid into the gastrointestinal lumen; (2) secretory diarrhea, characterized by increased secretion of fluid into the gastrointestinal lumen beyond the capacity to be reabsorbed; and (3) altered gastrointestinal tract motility. Differentiating osmotic from secretory diarrhea allows for a more directed diagnostic evaluation (Table 11. Osmotic diarrhea may be related to the malabsorption of carbohydrate, fat, or protein or to the presence of nonabsorbable substances in the gastrointestinal lumen. The characteristics of the stool may provide information that allows for the identification of the malabsorbed substance, particularly for isolated carbohydrate and fat malabsorption (Table 11. Secretory diarrhea is characterized by an excess of crypt cell fluid and electrolyte secretion that exceeds the absorptive capabilities of the villi and is classified by the presence or absence of normal villi. Inflammatory diarrhea of both infectious and noninfectious etiologies usually involves both osmotic and secretory components. Finally, surgical bowel resection may decrease the surface area available for the resorption of both fluid and solutes, leading to both a secretory and osmotic diarrhea. Patients with a history of immunodeficiency or malnourishment may be more likely to have an infection with atypical or opportunistic organisms or to have a more protracted and severe course. Hematuria or oliguria may suggest hemolytic uremic syndrome as a complication of infection with Escherichia coli 0157: H7 or Shigella. Physical Examination Physical examination should focus on assessing the level of hydration and the need for fluid resuscitation (Table 11. The general examination may reveal nonenteric infections that could present with diarrhea, such as otitis media, pneumonia, or sepsis. Abdominal tenderness or masses suggest appendicitis, intussusception, or less commonly, toxic megacolon. Generalized toxicity or shock may occur with hemolytic uremic syndrome or with sepsis, such as from invasive Salmonella or staphylococcal toxic shock syndrome. The introduction of an effective vaccine has decreased the incidence, with most infections occurring in unvaccinated children under 3 years of age. Transmission is by the fecal-oral route and the incubation period ranges from 1 to 3 days. Patients typically present with the acute onset of fever and vomiting followed 1-2 days later by watery diarrhea. In moderate to severe cases, dehydration, electrolyte abnormalities, and acidosis may occur. In immunocompromised children, persistent infection and chronic diarrhea can develop, with persistently positive diagnostic assays. Chronic infection is to be differentiated from postinfectious malabsorption seen in some immunocompetent children, in whom the small intestinal mucosa may require 3-8 weeks to recover its absorptive ability. The etiology of acute diarrhea is suggested by both the history and characteristics of the stool. Watery diarrhea is typical of viral gastroenteritis, as well as some bacterial and parasitic infections. Dysentery, characterized by severe diarrhea and the presence of blood and mucus in the stool, suggests bacterial colitis. Most Shigella infections in the United States occur in young children 1-4 years of age, with a peak seasonal incidence in late summer and early autumn. It may also be the most common bacterial cause of diarrhea outbreaks in daycare settings. During a 12- to 72-hour incubation period, patients may develop a nonspecific prodrome characterized by fever, chills, nausea, and vomiting. A predominantly rectosigmoid colitis develops and results in abdominal cramps and watery diarrhea. In more severe infections (bacillary dysentery), blood and mucus are passed in small, very frequent stools. High fever in young infants may induce febrile seizures, and some patients may develop hemolytic uremic syndrome. Many animal species, including poultry, farm animals, and household pets, serve as reservoirs for Campylobacter jejuni. Transmission occurs through ingestion of contaminated food, especially undercooked food, and through person-to-person spread via the fecal-oral route. The disease is common in infants and adolescents, and both daycare and college outbreaks have been reported. Campylobacter infection causes disease that may range from mild diarrhea to frank dysentery. The organism causes diffuse, invasive enteritis that involves the ileum and colon. Fever, cramping, abdominal pain, and bloody diarrhea are characteristic and may mimic symptoms of acute appendicitis or inflammatory bowel disease. Fever and diarrhea usually resolve after 5-7 days; prolonged illness or relapse occasionally occurs. Campylobacter infection is also known to cause meningitis, abscesses, pancreatitis, and pneumonia. The organism is present in animals and may be spread to humans by consumption of undercooked meat (especially pork), unpasteurized milk, and other contaminated foods. Young children are particularly susceptible to disease, and the frequency of infections increases during the summer months. Systemic manifestations, including myalgia, fatigue, and headache may accompany gastrointestinal symptoms. Bacterial Diarrhea Most bacterial diarrheal illnesses are foodborne and affect infants and young children more frequently than adults. Bacterial infections of the intestine cause diarrhea via direct invasion of the intestinal mucosa, followed by intraepithelial cell multiplication or invasion of the lamina propria. Cellular invasion may be followed by the production of cytotoxin, which disrupts cell function, and/or the production of enterotoxin, which alters cellular electrolyte and water balance. Bacterial adherence to the mucosal surface may result in flattening of the microvilli and disruption of normal cell functioning. Symptomatic differentiation from viral causes of diarrhea may be difficult, and sequelae of infections are varied (Table 11. Nontyphoidal Salmonella organisms are estimated to cause 1 million annual gastrointestinal infections in the United States. The attack rate is highest in infancy; the incidence of symptomatic infections is lower in patients older than 6 years. Salmonella infection may cause an asymptomatic intestinal carrier state (rare in children), enterocolitis with diarrhea, or bacteremia without gastrointestinal manifestations but with subsequent local infections, such as meningitis or osteomyelitis. Salmonella infection is usually spread through contaminated water supplies or food. Although an infected food handler may contaminate food sources, farm animals or pets are often the vector. Outbreaks may occur among institutionalized children; outbreaks in daycare centers are rare. After a 12- to 72-hour incubation period, gastroenteritis develops and is characterized by the sudden onset of diarrhea, abdominal cramps and tenderness, and fever. The diarrhea is watery, with stools containing polymorphonuclear leukocytes and, on occasion, blood. Carbohydrate malabsorption · Lactose intolerance · Osmotic laxatives (lactulose, polyethylene glycol 3350) · Antacids (magnesium hydroxide) · Ingestion of excessive amounts of non-absorbable sugar or sugar alcohols (sorbitol in chewing gum, diet candy, sucralose) · Dietary ingestion of excessive fructose (high-fructose corn syrup, ingestion of high-fructose­containing fruits in excessive amounts) · Disaccharidase deficiency (sucrose-isomaltase deficiency, glucosegalactose malabsorption, maltase-glucoamylase deficiency, congenital lactase deficiency) · Gastrocolic fistula, jejuno-ileal bypass, short-bowel syndrome 2. Antibiotics are not effective in alleviating symptoms of Yersinia enteritis or in shortening the period of bacterial excretion. At least 2 separate mechanisms are responsible for diarrhea: adherence to intestinal epithelial cells leading to villous injury and mucosal inflammation, and production of a toxin similar to that of Shigella organisms. Definitive diagnosis requires enterotoxin identification, and this method is not widely available. Other manifestations include asymptomatic infection and watery diarrhea without progression to hemorrhagic colitis. Clostridium difficile causes acute and chronic diarrhea in children when the normal colonic flora is disrupted. Pseudomembranous colitis is the most severe form of this infection, occurring as a result of a severe inflammatory response to the C.

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Lateral sinus thrombosis erectile dysfunction statistics us purchase kamagra super cheap, also known as sigmoid sinus thrombosis erectile dysfunction treatment in unani generic kamagra super 160 mg free shipping, forms when infection from the adjacent mastoid contacts and penetrates the venous wall and forms a thrombus erectile dysfunction doctor patient uk generic kamagra super 160 mg buy. These intracranial complications require broad-spectrum antibacterials and consultation with otolaryngology and neurosurgery for possible surgical interventions erectile dysfunction blogs buy kamagra super 160 mg line. Corresponding T1 shortening is seen in the precontrast magnetic resonance image (arrow in C) erectile dysfunction doctors in pa discount kamagra super online mastercard, with corresponding abnormal signal on the postcontrast images in keeping with clot or slow flow within the region of the right transverse sinus or sigmoid sinus (arrow in D). The incus long process is eroded, which leaves the drum adherent to the stapes head (S). An effusion is present in the middle ear, and squamous debris emanates from the attic. If findings are normal, the clinician should consider pain referred from another source (see Table 4. Overuse of tympanostomy tubes in New York metropolitan area: Evidence from five hospital cohort. Comparison of spectral gradient acoustic reflectometry and tympanometry for detection of middleear effusion in children. Global serotype distribution among Steptococcus pneumoniae isolates causing otitis media in children: Potential implications for pneumococcal conjugate vaccines. It is a clinical description, rather than a specific diagnosis, and represents a wide variety of presentations with diverse underlying pathology. Most occur in infants less than 1 year of age, with a peak incidence between 1 week and 3 months. The subjectivity and vagueness of the current definition has made it difficult to standardize the care of these patients. The guideline recommends limited interventions for patients designated as being at low risk for recurrence. Comorbid conditions are frequently identified, but it can be challenging to identify true causation. These need to be carefully considered in order to provide prompt life saving or outcome-altering treatment. It is often helpful to consider the differential diagnosis by a systems-based approach, considering both common and rare but concerning diagnoses in each category. Key systems-based historical and physical examination findings may help discriminate among possible etiologies (Table 5. In these cases, the duration of respiratory cessation aids in the determination of true pathologic apnea. Apnea is defined as cessation in breathing that is prolonged (>20 sec) or associated with cyanosis, marked pallor or hypotonia, or bradycardia. The degree of respiratory effort noted assists in differentiating central versus obstructive processes. If there is color change, providers should note not only the color itself (pale, red, cyanotic) but also the location, such as central cyanosis versus flushing or acrocyanosis. If abnormal movements were identified, it should be noted if the movements were generalized or localized to a certain part of the body. The ability to suppress any abnormal movements should be documented, as this makes conditions such as seizure less likely. Any interventions performed, by whom, and the effects of the interventions are also important to document. The need for resuscitation, especially when performed by health care providers, has been associated with more severe and significant underlying etiologies. It can be beneficial to obtain a direct history from any emergency personnel who may have been involved with the case. Level of alertness following the event and time until return to normal behavior are of particular importance. Regarding past history, it is essential to note the birth history including gestational age, any prior similar episodes, preceding illnesses, and known medical conditions. Social factors to consider include a full list of caregivers, illness exposures, medications in the home, and exposure to smoke. With a history of multiple events over days to months, the concern for child maltreatment, seizures, intracranial pathology, and inborn errors of metabolism increases. Multiple events occurring over the course of the day of presentation escalate concern for serious infections and child maltreatment. Clinical suspicion of child maltreatment also increases the likelihood of future adverse events. The history should focus on the activities and behaviors preceding the event, characteristics of the episode itself, interventions performed and their effect, and post­ episode events and behavior. A comprehensive past medical history, social history, and family history should also be obtained for identifying clues that may aid in narrowing the focus of the investigation. Key historical findings by system can be useful in narrowing the differential (see Table 5. The location and position of the child prior to the event should also be noted, such as placement in a car seat, on a soft or firm surface, prone or supine, and with or without surrounding blankets or pillows. Infants should undergo a complete head-to-toe examination fully unclothed, including vital signs with pulse oximetry, growth parameters with head circumference, and complete ear, nose, throat, cardiac, respiratory, abdominal, neurologic, musculoskeletal, and skin examinations. Any abnormalities on the presenting examination may indicate various possible diagnoses and should prompt additional evaluation for the suggested etiology (see Table 5. Abnormal growth parameters may identify failure to thrive, which can be suggestive of pathologic reflux, cardiac disease, or metabolic disorders. Signs of trauma, including retinal hemorrhages, unexplained bruising, or evidence of oral pharyngeal trauma (torn frenulum) suggestive of child maltreatment should also be noted. Abnormality of the neurologic examination should be fully assessed, with concern for intracranial bleed or mass requiring prompt attention. When testing is performed, it is most successful when done in a focused and targeted manner geared toward diagnoses suggested by the history and physical examination. However, any concerning historical or physical features require the need for further in-patient evaluation performed in a focused manner based on the clinical presentation and suspected diagnosis (see Table 5. Some infants will present with overt symptoms such as coughing, choking, and laryngospasm following regurgitation. Others can present without visible regurgitation but rather with posturing including arching of the back, torsion of the neck, and lifting up of the chin. This phenomenon, known as Sandifer syndrome, can be frightening to the observer and is often confused with seizure activity. Approximately 50% of all normal infants less than 3 months of age experience daily regurgitation, and temporal association does not necessarily equate with causation. Patients who present with these conditions will typically have additional historical and examination findings to suggest their underlying etiology. Patients with intussusception can have sudden and severe abdominal pain, inconsolable crying, and drawing up of the legs to the abdomen. The classic presentation of intussusception is the triad of abdominal pain, a sausage-shaped abdominal mass, and currant-jelly stool. Similarly, infants with volvulus can present with sudden onset abdominal pain accompanied by emesis. When testing is considered, it is important to understand the utility of various modalities. A history of multiple events on the day of presentation is associated with an infectious etiology. Additional historical clues include recent fever, irritability, altered level of arousal, cough, or coryza. Physical examination findings may confirm the suspicion of an infectious etiology, while hypothermia and ill appearance at presentation should lead to concern for more serious infectious etiologies. Apnea may be the presenting symptom of viral lower respiratory tract infections, with the telling symptoms of coryza and cough delayed by hours to days. Suspicion of respiratory infection must remain high, especially during peak respiratory illness periods, or if there is a history of recent exposure. Neonates with pertussis may present with or develop few other symptoms, so a careful history of potential exposure is essential for early diagnosis. Although 80 Section 1 RespiratoryDisorders uncommon in infants, strong suspicion or the development of a staccato cough with posttussive emesis, or a classic "whoop," should prompt treatment while waiting appropriate testing. A history of irritability and/or altered level of arousal may suggest a serious infection. Paradoxical irritability (crying when held) suggests soft tissue or bone infection or a fracture. Examination findings of concern include ill appearance, fever, hypothermia, lethargy, nuchal rigidity, and poor peripheral perfusion. The infection can lead to cardiorespiratory compromise, which can manifest as apnea, color change, altered levels of consciousness, or change in muscle tone. Factors that support the diagnosis of seizure include a history of loss of consciousness, poor tone, unresponsiveness, eye deviation, or rhythmic movements that are not able to be suppressed. Thus the lack of this historical fact should raise the suspicion for seizure in the differential. In cyanotic breath holding spells, there is usually an emotional trigger such as anger or frustration. The infants cry, then become silent and hold their breath in expiration with subsequent cyanosis. Pallid breath holding spells are less common and are typically triggered by pain or fright. The child may gasp, then lose consciousness and become pale, diaphoretic, and limp. This is classically characterized by adequate ventilation while awake but hypoventilation while asleep, associated with normal respiratory rates and shallow breathing. Additional rare, but potentially life-threatening, neurologic disorders to consider include brain tumors, neuromuscular disorders, metabolic encephalopathies, and malformations of the brain and brainstem. Examiners should therefore pay particular attention to any focal weakness, cranial nerve abnormalities, or signs of increased intracranial pressure including papilledema and Cushing triad (bradycardia, respiratory irregularities, and hypertension). In patients with suspected seizures, evaluation of serum electrolytes may also be beneficial to identify possible derangements including hypo- or hypernatremia, hypocalcemia, or hypoglycemia. If specific electrolyte abnormalities are identified, further work-up should be undertaken to determine underlying pathology. However, neuroimaging should always be considered in the infant with an abnormal neurologic examination or a clinical concern for seizure, child maltreatment, metabolic encephalopathies, or tumor to assess for intracranial malformation, bleeding, or mass. Chest and neck radiographs can be beneficial in assessing for signs of airway abnormalities or radiopaque foreign bodies. If there is high concern for anatomic abnormalities, evaluation by direct laryngoscopy, bronchoscopy, and/or esophagoscopy could be considered. However, in patients who are well-appearing without clinical concern for airway anomalies, the yield for these tests is low. Polysomnography can be useful in differentiating between central versus obstructive processes. Possible etiologies include head trauma (direct injury or repetitive shaking), smothering, ingestions, and factitious syndrome (formerly Munchausen syndrome) by proxy. There is a higher rate of child maltreatment in infants presenting with more severe initial episodes and in those requiring resuscitation. A careful ear, nose, and throat examination should be performed, noting any ear bruising, bleeding from the nose or mouth, or frenulum tears. A thorough neurologic examination is also essential, assessing for altered sensorium, fontanelle fullness, pupillary abnormalities, or other focal neurologic findings. If there is clinical suspicion for child maltreatment, a skeletal survey, cranial/brain imaging, select laboratory studies, and a dilated funduscopic examination should be considered to assess for supportive findings. Video surveillance while the infant is hospitalized can also be considered in these cases. In addition, if there is concern for possible intentional or unintentional poisoning, a toxicology screen could be considered to identify the presence of medications that could cause the presenting symptoms. However, in patients without historical or physical examination findings concerning for child maltreatment, the evidence does not support the routine use of any of these assessments. These include apnea of prematurity and infancy, periodic breathing, and airway abnormalities. Apnea of prematurity is thought to be due to immature respiratory control in premature infants and typically presents with either central or mixed (central and obstructive) apnea. It is a diagnosis of exclusion and should be considered only after other etiologies have been ruled out. The apneic events typically begin within the first week of life, and as such, symptom onset after that time should stimulate consideration of other causes. Sometimes several pauses occur, one after the other, followed by a set of short rapid respirations before the respiratory rhythm is restored. Importantly, no associated change in color, tone, or heart rate and no prolonged respiratory pauses (>20 seconds) are reported in association with periodic breathing. If determined to be periodic breathing, it is a benign entity and does not require any additional work-up or intervention. Less common respiratory etiologies to consider include anatomic airway abnormalities such as anomalies of the pharynx (adenotonsillar hypertrophy), the larynx (laryngomalacia, edema, subglottic ductal cyst, subglottic stenosis), or the trachea (tracheomalcia, aberrant innominate artery). A history of multiple and/ or escalating events over days to weeks, feeding difficulties, diaphoresis, failure to thrive, or a positive family history of cardiac disease should raise the index of suspicion for cardiac pathology. A complete cardiac examination should be performed, noting abnormalities that might suggest underlying cardiac pathology, such as irregular rhythms, decreased femoral pulses, or murmurs. If arrhythmia is strongly suspected or identified, assessment for electrolyte disturbances, such as hypo- or hyperkalemia should be undertaken. Although metabolic entities are rare, they can be progressive and life threatening and therefore should be considered in the differential for these patients.

Inborn errors of metabolism that can produce cardiomyopathy and associated arrhythmias in the neonatal period can be divided into five major diagnostic categories: (1) congenital disorders of glycosylation; (2) fatty acid -oxidation disorders; (3) glycogen storage disorders; (4) lysosomal storage disorders; and (5) respiratory chain defects (Table 99-4) relative impotence judiciary buy kamagra super 160 mg mastercard. The different groups of inborn errors of metabolism that can lead to cardiomyopathy do so via different pathophysiologic mechanisms impotence pills for men order kamagra super 160 mg. The glycogen storage disorders lead to impaired gluconeogenesis erectile dysfunction filthy frank 160 mg kamagra super buy fast delivery, depriving the heart of an essential energy source during fasting erectile dysfunction when cheating order kamagra super online from canada. The glycogen storage disorders may also lead to an infiltrative process erectile dysfunction medicine purchase kamagra super no prescription, resulting from the accumulation of partial breakdown products of glycogen. Fatty acid -oxidation disorders also lead to an energy-deficient state after glucose and glycogen stores have been depleted. The mitochondrial respiratory chain disorders also compromise energy production in the heart and/or lead to production of toxic metabolites. Fatty Acid -Oxidation Disorders the myocardium derives a significant fraction of its energy from the mitochondrial oxidative metabolism of fatty acids, especially long-chain fatty acids. Cardiomyopathy would be expected to develop in the context of a defect in carnitine-mediated transport of long-chain fatty acids into the mitochondrion, defects of the fatty acid -oxidation pathway, and defects of the respiratory chain itself. Studies have demonstrated that defects of long-chain fatty acid -oxidation are a significant cause of cardiac disease in the neonatal period, whereas defects affecting primarily medium- or shortchain fatty acid -oxidation are less so. The plasma membrane carnitine transporter deficiency does, however, lead to dilated cardiomyopathy in later infancy and childhood. The clinical features, diagnosis, treatment and prognosis of these disorders are discussed further in later sections of this chapter (see the Abnormal Newborn Infant: Laboratory Phenotypes: Hypoglycemia). Acid maltase is the only enzyme involved in glycogen metabolism that is located within the lysosome. Pompe disease can also be considered a lysosomal storage disorder, and it is probably helpful to consider its pathogenesis from this perspective. Acid maltase is a key enzyme responsible for degrading glycogen; it cleaves the -1,4-glucoside linkages of the glycogen polymer, converting glycogen to glucose. The diagnosis is supported by an increased serum creatine kinase activity and increased urinary excretion of a specific glucose tetrasaccharide, and then confirmed by enzyme analysis using skeletal muscle, cardiac muscle, or cultured skin fibroblasts, or by genetic testing. Enzyme replacement therapy for the infantile form of Pompe disease appears promising. The lysosomal storage disorders that may, on rare occasion, be associated with cardiomyopathy in the newborn period include glycolipidoses. Finally, group 3 includes Barth syndrome, an X-linked disorder that impairs production of the lipid membrane required for normal mitochondrial function. This disorder is characterized by cardiomyopathy, cataracts, deafness, and neutropenia. A careful ophthalmologic examination is a crucial part of the clinical evaluation for a suspected inborn error of metabolism; conversely, patients with unusual ophthalmologic findings might require a metabolic evaluation (see Chapter 103). Inborn errors of metabolism can affect any of the structural components of the eye. Lens dislocation does not generally occur during the neonatal period in patients with homocystinuria or sulfite oxidase deficiency, but may occur in older patients with these disorders. Respiratory Chain Disorders Several mitochondrial respiratory chain defects are associated with cardiomyopathy in the neonatal period. A second group of defects involves the genes that encode for the mitochondrial-encoded protein subunits of the respiratory chain. Common findings include poor feeding, jaundice, hepatomegaly, and splenomegaly (see Hepatomegaly and Splenomegaly). Several patients with an organic acidemia have undergone surgery for and been found to have pathologically confirmed pyloric stenosis. Researchers hypothesize that the organic acidemias produce toxic metabolites that affect pyloric sphincter tone. Similarly, pancreatitis is a well-documented problem in patients with several organic acidemias, fatty acid -oxidation disorders, or respiratory chain defects. Several lysosomal storage disorders can produce congenital ascites and hydrops fetalis (see Prenatal Onset). The precise pathophysiologic basis of these findings is not well understood, but is thought to be caused by direct bone marrow suppression of the metabolic imbalance associated with these disorders. Hematologic abnormalities may be associated with respiratory chain defects, including Barth syndrome4 and Pearson syndrome. Neutropenia is a characteristic feature of glycogen storage disease type Ib, and this diagnosis should be considered in the patient who presents with hypoglycemia, hepatomegaly, triglyceridemia, neutropenia, and recurrent infections (see Hypoglycemia). Abnormalities of the skin and hair are characteristic of several inborn errors of metabolism. Menkes disease, an X-linked disorder involving intracellular copper transport, leads to defects in several copperdependent enzymes. Menkes disease is a highly pleiotropic disorder characterized by sparse and kinky scalp hair (hence the name kinky-hair disease), hypotonia, hypothermia, intractable seizures, profound developmental delay, and early death. The disorder may be associated with lactic acidosis and seizures caused by impaired activity of cytochrome c oxidase, a copper-dependent enzyme. The hair is brittle and coarse in the childhood-onset form of argininosuccinic aciduria, a urea cycle defect, but this is not typically seen in neonates with this disease (see Hyperammonemia). Phenylketonuria may be associated with fair hair and skin in affected Caucasian neonates. Similarly, newborn infants with cystinosis have fairer hair and skin than their unaffected siblings. However, cystinosis, an autosomal recessive defect affecting lysosomal transport of cystine, a sulfur-containing amino acid, does not produce symptoms until several months of age, when it results in renal Fanconi syndrome and, ultimately, renal failure caused by cystine crystal deposits in the kidney. Rash and partial alopecia may be associated with multiple carboxylase deficiency, an organic aciduria caused by two defects in biotin metabolism: holocarboxylase synthetase deficiency and biotinidase deficiency (see Newborn Screening and Abnormal Laboratory Findings). Holocarboxylase synthetase and, in some cases, biotinidase deficiency can be detected by urinary organic acid analysis. Excluding disorders that are associated primarily with defects in bilirubin metabolism (see Chapter 100), several groups of disorders lead to hepatic dysfunction and some degree of hepatomegaly. One approach to categorizing these disorders is to divide them into those that impair one or more aspects of hepatic function to a more significant degree than they produce liver enlargement and those for which the reverse is true. The former group of disorders is discussed in this section; the latter group, composed primarily of storage disorders, is discussed under Hepatomegaly and Splenomegaly. The inborn errors of metabolism that cause hepatic dysfunction can be categorized further according to the function or functions that they impair: defects that cause hypoglycemia, defects that cause hepatocellular damage leading to liver failure and cirrhosis, and defects that cause cholestatic disease. Although this approach is useful from a physiologic perspective, many inborn errors affect more than one of these hepatic functions, and an alternative scheme based on biochemical classification may be applied more practically. It is recommended that defects of the following biochemical categories be considered in evaluating patients with hepatic dysfunction: amino acid metabolism, bile acid metabolism, carbohydrate metabolism, congenital disorders of glycosylation, fatty acid -oxidation, peroxisomal disorders, respiratory chain defects, and a miscellaneous group of disorders (Table 99-5). Until recently, the only treatment for this disorder that appeared to be effective was liver transplantation. Urea cycle defects are generally associated with mild hepatocellular dysfunction during their acute presentation, but the neurologic manifestations of these disorders are the predominant signs (see Hyperammonemia). The degree of hepatocellular disease can become more significant later in the course of these diseases, especially in argininosuccinic aciduria. There is, however, a urea cycleelated disorder called citrin deficiency that may produce neonatal intrahepatic cholestasis. Impaired citrin function would limit the conversion of citrulline and aspartate to argininosuccinic acid, a strategic component of the urea cycle. Citrin deficiency was identified as a self-limited disorder associated with hepatic dysfunction that resolves by 1 year of age and can be treated successfully with a lowlactose diet and support for the hepatic dysfunction. However, more severe, progressive cases have also been identified that produced severe neonatal intrahepatic cholestasis. Fumarylacetoacetate accumulates secondary to this enzyme deficiency and is nonenzymatically converted to succinylacetone, which is the characteristic urinary metabolite identified in patients with this disorder. Succinylacetone can be Bile Acid Biosynthesis Defects Heritable defects in bile acid biosynthesis can cause severe hepatobiliary disease (cholestatic jaundice and intestinal malabsorption) in the newborn infant. In simple terms, bile acid biosynthesis involves conversion of cholesterol to two bile acids, cholic acid and chenodeoxycholic acid. The first steps in this conversion involve transformation of the cholesterol nucleus, and the last few steps involve transformation of the cholesterol side chains. Several defects in conversion of the cholesterol nucleus to bile acids have been described, including: 3-hydroxy-5-C27-steroid dehydrogenase deficiency and 3-oxo-4-steroid-5-reductase deficiency. The patients generally have no or relatively mild hepatomegaly, mildly elevated hepatic aminotransferase values, and nonspecific findings on liver biopsy. If untreated, many patients progress to irreversible liver disease and die in early childhood. Early recognition is crucial because it permits institution of bile acid replacement therapy using a combination of cholic and chenodeoxycholic acids, which is effective in reversing the hepatotoxic manifestations of these enzyme deficiencies. Several of the peroxisomal disorders also impair bile acid biosynthesis because they affect enzymes required for the final steps of cholesterol side-chain oxidation. Bile acid replacement therapy does not ameliorate the neurologic consequences of these disorders. The peroxisomal disorders, including those that produce cholestatic disease, are discussed further under Dysmorphic Syndromes. However, these disorders affect gluconeogenesis and, in contrast to galactosemia and hereditary fructose intolerance, result primarily in hypoglycemia and hepatomegaly rather than generalized hepatocellular dysfunction (see Hypoglycemia). Fatty Acid Oxidation Defects In general, the disorders of long-chain fatty acid -oxidation cause hepatic dysfunction to a greater degree than do the disorders of medium- or short-chain fatty acid -oxidation. A related disorder of fatty acid -oxidation that is associated with hepatic dysfunction is multiple acyl-CoA dehydrogenase deficiency. Some forms of this disorder are associated with dysmorphic features (see Dysmorphic Syndromes). All of these disorders produce several forms of disease, ranging from a severe neonatal/early infantile form to a Carbohydrate Disorders Two disorders of monosaccharide metabolism, galactosemia (see Newborn Screening) and hereditary fructose intolerance, are associated with hepatocellular disease. Similarly, these disorders are detectable by urinary screening tests only when the affected newborn is receiving a diet containing the offending monosaccharide. Because fructose is not a component of breast milk and is a component of only the infant formulas that contain sucrose, hereditary fructose intolerance usually does not manifest in the neonatal period. Both disorders can be detected by the presence of reducing substances other than glucose in urine (see Specialized Biochemical Testing). The diagnosis of galactosemia or hereditary fructose intolerance must be confirmed by specific biochemical analysis or genetic testing. Treatment of these disorders consists of dietary restriction of the hepatotoxic monosaccharide. Such restriction is not easily managed because of the nearly ubiquitous presence of galactose (in the form of lactose) and fructose (in the form of sucrose) in many processed foods. The severe neonatal form is usually associated with hepatic dysfunction, presumably due to the impaired mitochondrial energy production from long-chain fatty acids and/or hepatotoxic metabolites that might accumulate secondary to the impaired fatty acid oxidation. Peroxisomal Disorders Several of the peroxisomal disorders cause significant hepatocellular disease in the neonatal period. Many of these disorders also produce dysmorphic manifestations and are discussed later (see Dysmorphic Syndromes). Respiratory Chain Defects Several mitochondrial respiratory chain defects are associated with hepatic dysfunction in the neonatal period. Pearson syndrome (also known as Pearson marrow-pancreas syndrome) is the prototype of this group of diseases. It manifests in the newborn period with a variable pancytopenia (characterized by severe macrocytic anemia) and ring sideroblasts in the bone marrow; exocrine pancreatic dysfunction leading to fat malabsorption and diarrhea; hepatic dysfunction (steatosis and cirrhosis, possibly leading to liver failure and death); renal tubular dysfunction; and skeletal muscle weakness. Mutations of these genes have been identified as a cause of neonatal liver disease. These disorders can be identified by a combination of classical biochemical studies followed by genetic testing (see Lactic Acidemia). Other Disorders Two other disorders should be considered in the miscellaneous category of inborn errors of metabolism that cause hepatic dysfunction in the newborn period: Niemann-Pick disease type C and neonatal hemochromatosis. Niemann-Pick disease type C is a disorder of intracellular cholesterol trafficking that generally causes benign transient neonatal jaundice although it may progress to fulminant hepatic failure. The disease subsequently manifests in adolescence or adulthood as a progressive neurodegenerative disorder. Another disorder, neonatal hemochromatosis, can produce severe liver dysfunction, but is not understood to be a discrete inborn error of metabolism and is considered elsewhere in this text. Fatty acid oxidation disorders produce hepatomegaly through excessive storage of fat, and are discussed elsewhere in this chapter. Another group of disorders, the lysosomal storage disorders, results in hepatomegaly because of excessive storage of incompletely metabolized macromolecules in the liver. In the absence of one or more of these enzymes, the macromolecules are only partially degraded. Depending on the origin and nature of the macromolecules, the partially degraded products accumulate in one or more tissues or organs and produce a range of clinical phenotypes. Another group of lysosomal storage diseases is associated with defects of lysosomal transport. Several lysosomal storage disorders manifest in the neonatal period and should be considered in the differential diagnosis of patients who present with hepatomegaly, with or without other signs of storage disease (see Table 99-6). However, these disorders do not generally present in the neonatal period and will not be discussed further in this section. Similarly, defects of gluconeogenesis can present with hepatomegaly, but they will also be discussed elsewhere (see Hypoglycemia). Several glycolipidoses or related disorders of complex lipid catabolism can manifest with hepatomegaly or splenomegaly in the newborn period. An acute neuronopathic form of Gaucher disease results in hepatosplenomegaly during the first months of life. In these patients, the characteristic neurologic picture includes trismus, strabismus, and retroflexion of the head, followed by inexorable neurologic deterioration. This autosomal recessive disorder is caused by a deficiency of glucosylceramidase.

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