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The choice of antiprotozoal drug used for Since blood-to-blood spread can occur buy cheap clomiphene 100 mg on line, universal treatment will depend upon: precautions regarding sharps and other intravenous • the type of Plasmodium species identified; and buy clomiphene 100mg cheap, equipment should be applied (see Module 1) trusted clomiphene 100mg. It is • whether the parasites are resistant to any of the important that medical staff be aware that blood drugs. They include: • control of the mosquito population through chloroquine, Pyrimethamine-sulfadoxine, prevention of mosquito breeding sites, indoor mefloquine, quinine and tetracyclines. Patients residual spraying and/or consistent use of with severe falciparum malaria require prompt impregnated bednets; treatment, preferably with quinine parenterally, • control of other factors associated with potential depending upon the patient’s condition. The disease may manifest with a prodromal viral disease found in domestic and wild animals. Mode of transmission Rabies is transmitted to humans through close Prodromal phase contact with infected saliva, whether through a • The incubation period is usually 2–8 weeks but bite, scratch or lick onto mucous membrane or may be more than a year. It is not, in the natural sense, a disease and brain, or where large amounts of virus are of humans; rather, human cases are incidental to transmitted, result in shorter incubation periods. Epidemiological summary With the exception of Antarctica and Australia, Furious rabies animal rabies is present in all continents. It is • Initial neurological signs may include endemic in wild animals (particularly foxes) in rural hyperactivity, disorientation, hallucinations or areas of northern Europe and is found in most bizarre behaviour. Most infections biting or other bizarre behaviour, alternating with resulting from dog bites occur in the Eastern periods of calm where patients are often cooperative European countries. In an effort to further eradicate the disease followed by severe spasms of the pharynx, larynx in foxes, a campaign began in 1990 to orally and diaphragm that produces choking, gagging and immunise wildlife in European countries. Manifestations • The patient is initially relatively intact mentally, Page 115 Rabies virus infects the central nervous system, with little agitation or confusion, but the mental causing encephalopathy. Once symptoms develop, status gradually deteriorates from confusion to there is no known cure and the disease is always disorientation, stupor and finally coma. Module 4 Page 115 • The acute neurological phase lasts 2–7 days with vigorous washing and flushing with soap and water, the longer duration in the paralytic form. Following this, apply either ethanol (700 ml/l), • Coma may last for hours to months, but in tincture or aqueous solution of iodine or povidone untreated patients, respiratory arrest usually occurs iodine. Even if intensive care facilities are available, The infiltration of human rabies specific complications occur during the coma phase, which immunoglobulin around the wound may be result in death: hypoxia, anaemia, renal failure, indicated in high risk cases, for example, bites cardiac arrythmias, congestive cardiac failure, and sustained in a country where there is a high risk of cerebral oedema. Human rabies Those who work with animals in endemic areas, specific immunoglobulin provides immediate and anyone exposed to an animal bite or lick on passive protection. Rabies immunoglobulin is difficult to access in many areas Diagnosis and rabies vaccine can be expensive (see further No tests are currently available to diagnose rabies notes) so may not be easily available. In the clinical course of the disease, the virus can Now carry out Learning Activity 6. A corneal impression smear and skin biopsies may Nursing care show a positive result; although this will confirm Intensive care facilities can prolong life, but since a diagnosis, a negative result does not exclude death is inevitable, the most humane care for such infection. Postmortem diagnosis can be confirmed patients involves the relief of agony and suffering by examination of brain tissue. Methods of treatment Supportive care for the presenting symptoms There is no specific treatment once the disease is includes: established. Since elimination of the rabies virus at the site of infection by chemical or physical means is the most Infection control effective mechanism of protection, immediate Rabies virus may be present in saliva, tears, urine, Page 116 Module 4 or other body fluids. Therefore, in order to prevent any possible transmission basic precautions, Universal Precautions and transmission based precautions should be taken (see Module 1). While human-to-human transmission has not been recorded, pre-exposure vaccination is recommended for those caring for, or likely to care for, a patient with rabies. Post-exposure vaccine can be given to staff found to be caring for infected patients. Prevention of spread This is dependent upon: • reduction of rabies virus in animal hosts through vaccination campaigns; and • post-exposure treatment following a potentially infected bite. Pre- exposure vaccination does not rule out the need for further vaccine if exposed to the virus. Epidemiological summary • Clinical examination at this stage may also show Tetanus occurs throughout the world and is a rigidity of spinal muscles and board like firmness leading cause of death in many developing of the abdominal muscles. Countries in Europe reporting sporadic cases in • The death rate is estimated at 3 per 100 with recent years include Albania, Azerbaijan, Croatia, good hospital care. Clostridium tetani is Mode of transmission recovered from the wound in only 30% of patients. The bacterium Clostridium tetani is found in the intestinal tracts of man and animals, where it Methods of treatment remains harmless and causes no disease. However, Guidelines for treating wounds spores are produced which are passed in the faeces, Thorough and careful wound cleaning is essential and contaminate the environment. Protection against can persist for years in soil and dust and are resistant tetanus with vaccine and human tetanus to heat, drying, chemicals and sunlight. Tetanus cannot be spread directly by person- • Six hour interval between wound or burn and to-person contact. These spasms are often that shows substantial devitalised tissue, a puncture triggered by sensory stimuli, so a calm, quiet wound,contamination with soil or manure, and the environment should be provided. These may be different in other Tetanus can never be eradicated because the spores are European countries. However, prevention of Specific anti-tetanus prophylaxis Immunization Status Clean Wound – Treatment Tetanus Prone Wound – Required Treatment Required Last of 3 dose course or Nil Nil (a dose of human tetanus reinforcing booster immunoglobulin may be given if within last 10 years infection is considered high e. Patients with mild muscular spasms may be treated Immunization should therefore be given to anyone with infusions of diazepam. Post-exposure prophylaxis with specific human immunoglobulin can be initiated following a Modes of transmission potentially infectious tick bite, but there is no The virus responsible for this disease is transmitted specific treatment for this disease once established. Skin should be inspected Epidemiological summary for ticks every few hours and any ticks found should The disease is endemic in parts of Europe and be removed immediately. Scandinavia, and in forested areas (especially where • Those living in endemic areas should be aware there is heavy undergrowth). Immunization Manifestations A pre-exposure vaccine is available for those likely • The incubation period is 1–2 weeks. The vaccine is will develop after 10 days, characterised by severe widely used to protect special groups of workers headache and fever. Prompt treatment with post exposure prophylaxis Risk factors (specific human immunoglobulin) is available and Tickborne encephalitis is primarily an occupational provides immediate passive protection if given disease affecting soldiers, agricultural workers, and within four days of the tick bite. Urgent diagnosis is required • Faecal-oral spread through eating poorly cooked because sight may be severely and permanently meats, especially pork and mutton. Reactivation of latent illness • Faecal-oral spread through contact with cat’s The most common presentation is as faeces. The diagnosis Vertically: a congenitally acquired infection can of endophthalmitis is by culture of vitreous occur when a pregnant woman acquires an acute humour. Treatment Treatment is usually with oral pyremethamine and Epidemiological summary sulphonamide. Hospital referral is essential for Toxoplasmosis is one of the most common of infants with endophthalmitis. It is more common in countries where important for women during pregnancy and the meat is eaten raw or rare.
Echocardiography is important to assess extent of fluid accumulation and need for intervention to pre- vent cardiac tamponade order clomiphene 50 mg visa. Nonsteroidal anti-inflammatory agents are typically used to reduce inflammation and to assist with pain generic clomiphene 25 mg online. Steroids may be indicated if fluid accumulation is significant and there is urgent need to reverse inflammatory process cheap clomiphene 50 mg fast delivery. Pericardiocentesis is indicated if pericardial fluid accumulation is excessive and interfering with cardiac output. Cardiac Conditions An essential goal for evaluating any child with chest pain is to rule out cardiac anomalies. Cardiac cause of chest pain is rare; however, it is primary concern of families of children with chest pain and if left undiagnosed may lead to significant complications. The role of any primary care physician confronted with a child with chest pain is to develop a list of differential diagnosis based upon history of illness, family history and physical findings on examination. In making the determination whether the cardiovascular system is the cause of chest pain it is helpful to identify on one hand red flags pointing towards cardiac disease and on the other hand signs which indicate etiologies of chest pain other than the cardiovascular system. Features suggesting cardiac disease (red flags) Abnormal findings in history • Syncope • Palpitations 418 I. Severe pulmonary or aortic valve stenosis: This can lead to ischemia and results from increase myocardial oxygen demand from tachycardia and increase pressure work by the ventricle. These disorders almost always are diagnosed before the child presents with pain, and the associated murmurs are found on physical examination. Chest X-ray may show a prominent ascending aorta or pulmonary artery trunk, echocardiogram is the key in the diagnosis. Anomalous coronary arteries: Such as anomalous origin of the left or right coronary arteries, coronary artery fistula, coronary aneurysm/ stenosis secondary to Kawasaki disease. These can result in myocardial infarction without evidence of underlying pathology. However, chest pain is not typical in any of these conditions in the pedi- atric cage group. These conditions are associated with significant murmurs such as pansystolic, continuous or mitral regurgitation murmur or gallop rhythm that sug- gests myocardial dysfunction. These patients should be referred for evaluation by a pediatric cardiologist for assessment and treatment. Hypertrophic obstructive cardiomyopathy: This hereditary lesion has an auto- somal dominant pattern and patients have positive family history of the same disorder or a history of sudden death. Children with this disorder have a harsh systolic ejection murmur that is exaggerated with standing up or performing Valsalva maneuver. Echocardiogram is the study of choice to evaluate this condi- tion, referral to a pediatric cardiologist should be done to evaluate patient and his/ her family. Case Scenarios Case 1 History: A 14-year-old girl previously healthy comes to your office complaining of chest pain that started 6 months ago. Pain lasts for few seconds, sometimes related with exercise but without difficulty in breathing. Medical attention was sought due to chest pain and desire to join school’s basketball team. Physical exam: Vital signs are within normal limits, physical examination is normal except for tenderness when palpating the left 3, -4, -5 costochondral junctions. Diagnosis: History and the physical examination are highly suggestive of costo- chondritis. The nature of pain, lack of any significant findings through history and physical examination and the ability to induce chest pain while pressing on affected costochondral junctions point to the diagnosis of costochondritis. Treatment: Reassurance that the pain is benign and is not related to the heart is essential. Pain and inflammation of the affected costochondral junction can be eliminated through a 5–7 days course of nonsteroidal anti-inflammatory agent such 420 I. Case 2 History: A 6-year-old boy presents to the emergency room with a 1 day history of severe chest pain localize to the left side of the chest. The mother states that the child was noted to have fever and decrease in appetite of 1 day duration. Past medical history is significant for surgical repair of sinus venosus atrial septal defect 2 weeks ago. Surgical repair was uneventful and the child was discharged home 4 days after surgery in stable condition. Vital signs dem- onstrate rapid respiratory and heart rates, normal oxygen saturation and normal blood pressure measurements. Diagnosis: the past medical history and finding of friction rub is suggestive of pericarditis. The cause of pericarditis and chest pain in this child is post-pericardiotomy or Dressler’s syndrome. Treatment: In view of the small volume of pericardial effusion, compromise of cardiac output is not a present concern. If pericardial effusion continues to enlarge despite medical therapy then pericardiocentesis can be used to remove pericardial fluid. Chapter 36 Innocent Heart Murmurs Ra-id Abdulla Key Facts • Innocent heart murmurs are encountered in 50% of all children. Instead, mild turbulence of blood flow, combined with the rapid heart rate and thin chest wall in children allow nor- mal blood flow through normal cardiovascular structures to be audible. Heart murmurs resolve spontaneously as child grows older with slower heart rate and thicker chest wall. Narrowing of passageways of blood results in turbulence which is characterized by eddies or recirculation. Eddies produces vibrations which can be heard through auscultation and in severe cases palpable as a thrill. On the other hand, laminar flow of blood is relatively silent and not audible through auscultation. Narrowing of blood vessels or cardiac valves results in rapid change (drop) in pressure, also referred to as pressure gradient, this causes fluid to accelerate which in turn results in eddies or recirculation phenomenon. Eddies produce the vibrations which result in murmurs or when significant a thrill which can be felt by hand through palpation. Types of Innocent Heart Murmurs Innocent heart murmurs are defined by the cardiac structure producing the murmur. Different types of innocent heart murmurs are caused by different physiological processes (Table 36. When examining a child with a heart murmur features of pathological murmurs should be carefully examined to rule out presence of con- genital heart disease (Table 36. Heart murmurs conforming to any type of inno- cent heart murmurs do not necessarily require referral to a pediatric cardiologist. On the other hand, lack of clarity of the nature of the murmur examined or in the presence of any feature that may indicate that the murmur is pathological in nature, referral to a pediatric cardiologist for further evaluation is necessary (Table 36. History or physical examination consistent with pathological murmur History of frequent respiratory infections or history of atypical reactive airway disease Patients with syndromes which may be associated with heart diseases such as trisomy 21, Turner syndrome, Noonan syndrome, William’s syndrome Family history of congenital heart disease Change in nature of murmur, such as becoming louder, or becoming systolic and diastolic Evidence of cardiac disease by chest X-ray or electrocardiography Peripheral Pulmonary Stenosis This is the most common type of innocent heart murmurs in newborn children and infants younger than 2 months of age. Turbulent blood flow in relatively small peripheral pulmonary arteries cause this type of innocent heart murmur.
Rejected cases include those in which an alternative diagnosis is confirmed or if the fever resolves with a short course of antibiotics of less than 4 days purchase 50mg clomiphene with amex. About half of the patients have positive rheumatoid factor or evidence of immune complexes purchase clomiphene 25mg with visa. Anemia may be present and is caused by hemolysis or the presence of chronic infection best purchase for clomiphene. Prolonged therapy is usually required and the specific duration and combination of agents used is determined by the infecting microor- ganism, the location of the infection, whether it involves a native or a prosthetic valve, and the presence of complications. It is essential to obtain information about the microbiologic sensitivity to antibi- otics and the minimal inhibitory concentrations as this will determine the duration and combination of antibiotics used. Surgical treatment may be required in 25–30% of patients in the acute phase of the disease. Circumstances in which surgical treatment is necessary include patients with recurrent embolization despite antibiotic therapy, those who fail medical therapy, and those with progressive heart failure due to damage of cardiac struc- tures such as with severe valve regurgitation. Prognosis Infective endocarditis continues to have significant morbidity and mortality despite advances in medical and surgical treatment. Mortality rate for viridans streptococcal endocarditis with no significant complications is less than 10%. On the other hand, Aspergillus endocarditis after prosthetic valve surgery carries an almost 100% risk of death. Antibiotic prophylaxis is no longer recommended at the time of gastrointestinal or genitourinary procedures. Case Scenarios Case 1 History: A 6-year-old girl presents with 2-week history of intermittent fevers. She was initially seen in the first week of illness by her physician and was diagnosed with otitis media. In addition she complains of headaches, abdominal pains, and daily fevers with sweating. Cardiac examination is significant for regular rate and rhythm with no thrill; normal S1 and narrow splitting of S2. There is a 2/6 systolic ejection murmur at right upper sternal border and 2/4 early diastolic murmur at left midsternal border. Differential diagnosis: This patient is presenting with the complaint of a 2-week history of fever and lethargy. These auscultatory findings are most consis- tent with a stenotic and insufficient aortic valve. Due to the rather insidious onset in this particular patient, Strep viridans would be the most likely infectious etiology, but other causes such as S. Final diagnosis: Due to the presence of fever with heart murmur, three sets of blood cultures are obtained and a transthoracic echocardiogram is performed. The echo shows the presence of a bicuspid aortic valve with a 4-mm vegetation on one of the leaflets and moderate aortic valve regurgitation. Assessment: This case shows the typical presentation of a native valve endocarditis with history of aortic valve stenosis that was not diagnosed previously. Group A Streptococcus (Viridans group) continues to be the most common causative agent in this situation. This patient was treated for 6 weeks and did not require immediate surgical therapy, although she does demonstrate the complication of aortic valve regurgitation. Management: Empiric intravenous antibiotic therapy is initiated based on these findings pending blood culture results. The patient is intubated, with an umbilical central venous line and a peripheral intravenous line in place. Investigative studies: A complete blood count is performed with a white cell count of 31,000 with 66% segmented neutrophils and 18% bands, Hgb of 9. A blood culture is obtained and treatment is initiated with empiric ampicillin and gentamicin. Final diagnosis: After 24 h, the initial blood culture grows gram-positive cocci and Ampicillin was changed to Vancomycin. Due to the persistent positive blood cultures, an echocardiogram is performed which shows a mobile 12-mm mass on the atrial septum with small vegetations on both sides of the septum. Premature infants have increased susceptibility due not only to prematurity, but also the increased use of indwelling catheters used for intrave- nous fluids, nutrition, and monitoring in the intensive care unit. These patients are also at increased risk for gram-negative and fungal endocarditis in addition to Staphylococcus species. This patient does well with prolonged antibiotic therapy and is discharged home without sequelae. Torchen Case 3 History: A 16-year-old female presents with a 3-day history of fevers, chills, head- aches, shortness of breath, and chest pain. Her past medical history is significant for the diagnosis of aortic stenosis and regurgitation which necessitated aortic valve replacement with native pulmonary valve and insertion of a homograft pulmonary valve replacement 1 month ago (Ross procedure). Cardiac examination is significant for normal S1 and single S2 with an ejection systolic-early diastolic mur- mur over the left upper sternal border with no clicks or gallop. Abdominal examina- tion reveals an enlarged liver down to 3 cm below right costal margin. Investigative studies: A complete blood count is performed with a white blood cell count of 17,400 with 85% segmented neutrophils, Hgb of 11. Differential diagnosis: This case presents a patient with recent valve replacement who subsequently develops a febrile illness with physical examination findings sug- gestive of pulmonary stenosis and insufficiency with evidence of new congestive heart failure. Myocarditis or pericarditis as a cause for fever and new onset congestive heart failure must also be considered. Final diagnosis: Transthoracic echocardiogram shows the presence of a large veg- etation 1 cm in diameter attached to the pulmonary valve with moderate degree of pulmonary stenosis and insufficiency. Two sets of blood cultures are sent and the patient is started on empiric antibiotic therapy with oxacillin and gentamicin. Assessment: This case illustrates the late presentation of prosthetic valve endo- carditis caused by S. These patients frequently require prolonged antibiotic therapy and often surgical intervention for debridement and replacement of the prosthetic valve. These postoperative infections are thought to be caused by organ- isms inoculated at time of surgery. The presentation is usually in the first 2–3 months after surgery, but can occur several months after. She devel- ops evidence of pulmonary embolism which requires surgical therapy with replace- ment of the pulmonary valve. Chapter 30 Myocarditis Rami Kharouf and Laura Torchen Key Facts • Most cases of myocarditis are thought to be secondary to viral infection; however, in many instances, documentation of viral infection is lacking.
Blood stream infections of abdominal origin in the intensive care unit: characteristics and determinants of death buy cheap clomiphene online. Hjalmarson Division of Geographic Medicine and Infectious Diseases discount clomiphene 100 mg with mastercard, Department of Medicine generic 100 mg clomiphene visa, Tufts Medical Center, Boston, Massachusetts, U. Gorbach Nutrition/Infection Unit, Department of Public Health and Family Medicine, Tufts University School of Medicine, and Division of Geographic Medicine and Infectious Diseases, Department of Medicine, Tufts Medical Center, Boston, Massachusetts, U. Staphylococcus aureus was the suspected pathogen since it was frequently recovered from patients stool culture samples. With increased use of cephalosporins in the 1980 to 2000, it became the antibiotic class most commonly associated with C. The incidence among hospitalized patients increased from 3 to 12/1000 persons in 1991 to 2001 to 25 to 43/1000 persons in 2003 to 2004. In addition, there were increased rates of more serious disease that was refractory to therapy. Symptomatic and asymptomatic infected patients are the major reservoirs and sources for environmental contamination. A study from 2004 showed that incidence is higher during winter months, which may reflect increased patient census, severity of illness, and antibiotic use due to high rates of respiratory infections (16). It persists as a highly resistant spore that may survive for months in the environment. The gastrointestinal tract of young mammals, including humans, appears to be a reservoir. Most cases of disease appear to be caused by acquisition of the organism from an exogenous source, rather than from endogenous colonization. In fact, colonization with either toxigenic or nontoxigenic strains appears to protect from clinical disease (20). Antibiotic Exposure 12 In healthy adults, the colon contains as many as 10 bacteria/g of feces, the majority of which are anaerobic organisms (21). This flora provides an important host defense by inhibiting colonization and overgrowth with C. An animal model (22) showed that agents that disrupt the intestinal flora and lack activity against C. In general, however, antibiotics with significant antianaerobic activity, and to which C. Fluoroquinolones (ciprofloxacin) were approved for use in the United States 1987 and has been frequently used to treat inpatient and outpatient infections. In addition, patient clustering, a greater likelihood of antibiotic use, and a larger proportion of elderly patients may facilitate transfer of the organism (1). The rates of colonization in the feces among hospitalized patients are 10% to 25% and 4% to 20% among residents of long-term facilities as opposed to 2% to 3% among healthy adults in the general population. Other factors that increase the vulnerability of the elderly are underlying severe disease, nonsurgical gastrointestinal procedures, and poor immune response to C. In addition, there is a higher likelihood of comorbidities in older patients that may lead to more frequent hospitalizations and exposure to antibiotics compared with the younger population. Immunity Host immune response plays an essential role in determining whether patients become colonized with C. As mentioned previously, most patients remain asymptomatic following acquisition of C. Patients with a normal immune system who are exposed to toxin A, mount serum IgG antitoxin A antibody in response to C. In elderly patients and patients with severe underlying illnesses, the immunologic response may be blunted leading to lower serum antibody response to toxin A. In the colon, the spores convert to their vegetative, toxin-producing form and become susceptible to killing by antimicrobial agents. Toxin A is a 308-kDa enterotoxin that produces acute inflammation, leading to intestinal fluid secretion and mucosal injury (33). Toxin B is a 270-kDa cytotoxin that is 10 times more potent than toxin A in mediating mucosal damage in vitro. Both toxins act intracellularly by inactivating proteins in the Rho subfamily, which regulate the F-actin cytoskeleton. This results in disaggregation of actin, opening the tight junctions between cells, and resulting in cell retraction and apoptosis manifested as characteristic cell rounding in tissue culture assays and shallow ulceration on the intestine mucosal surface (17,34). Both toxins are also proinflammatory, inducing release of cytokines, phospholipase A2, platelet-activating factor (33), tumor necrosis factor-a, and substance P. This results in the activation of the enteric nervous system, leading to neutrophil chemotaxis and fluid secretion. While most strains produce both toxins, some produce toxin B only but can be equally virulent as strains with both toxins. Colonization rates of 25% to 80% are seen in healthy infants and neonates but clinical illness is rare (3). For unclear reasons, colonization appears to wane with advancing age, and 276 Hjalmarson and Gorbach Table 2 Definition of Clostridium difficile infection 1. Presence of symptoms >3 unformed stools over 24 hours for at least 2 days in the absence of ileus and 2. Positive stool test for the presence of toxigenic Clostridium difficile or its toxins or 3. Colonization increases to 20% to 30% of hospitalized adults (26), but clinical symptoms develop in only one-third of those who become colonized (34). However, colonized individuals shed pathogenic organisms and serve as a reservoir for environmental contamination. Symptoms can begin as early as the first day of antibiotic use or as late as eight weeks after completion of the precipitating antibiotic course (25). For mild disease, the diarrhea is usually the only symptom, involving <10 episodes a day without systemic symptoms. The diarrhea is frequently watery with a characteristic foul odor, but it can also be mucoid or mushy. Moderate disease, defined as <10 bowel movements per day, leukocytosis <15,000 cells/mL, and creatinine <1. Severe disease defined as >10 bowel movements per day, leukocytosis >15,000 cells/mL, elevated creatinine (>1. The first warning sign of fulminant colitis may be diminishing diarrhea, due to decreased colonic muscle tone. A study of 44 patients undergoing colectomy for fulminant colitis reported that 5 (11%) presented with frank peritonitis, hypotension, or both (40). Characteristic laboratory findings include leukocytosis that may be severe and hypoalbuminemia. Hypoalbuminemia is the result of large protein losses attributable to leakage of albumin and may occur early in the course of the disease (25).