Deborah Barnett PhD, MS

• Chief of Curriculum and Instruction

https://publichealth.berkeley.edu/people/deborah-barnett/

Lubiprostone (Amitiza) can be used for opioid-induced constipation at the 24 mcg twice a day dose gas treatment purchase 250 mg lariam free shipping. Naloxegol (Movantik) and methylnaltrexone (Relistor) are peripheral rather than central mu-antagonists medications qid buy 250mg lariam with amex, so they are indicated for managing opioid-induced constipation without negatively impacted pain control treatment 2nd degree heart block lariam 250mg order line. Bisacodyl should not be used chronically due to its potential to damage the myenteric plexus of the gut and cause severe and permanent impairment of colonic motility medicine quotes purchase generic lariam on-line. As a word of caution medications metabolized by cyp2d6 buy generic lariam 250mg online, recent research has demonstrated a twofold to threefold increase in all-cause mortality with chronic opioid use, especially if using more than 200 mg/day morphine equivalent and/or sustained-release or long-acting (methadone) preparations. The risks of using chronic opioids likely outweigh the benefits in the management of headache, fibromyalgia and chronic low back pain according to a 2014 position paper from the American Academy of Neurology. This protects both you and your provider(s) and helps to ensure compliance with federal and/or state laws regarding such substances. I understand that if I break this Agreement, my provider will stop prescribing these medications. In the event of an Agreement violation, my provider may choose to taper me off of my medication, discontinue the medication and prescribe another medication to treat the withdrawal symptoms, or discontinue the medication and refer me to a detoxification program. If the medicine prescribed is a pain medication, I will communicate fully and honestly with my provider about the character and intensity of my pain, the effect that my pain has on my daily life, and how well the medication is helping to relieve my pain. I will comply with this treatment with the same diligence as is expected for my controlled medication. Additionally, I understand that alcohol, although legal, should not be used in conjunction with my medication as the combination could be fatal. Altering a prescription in any manner, selling medications to others, or misrepresenting myself to a pharmacy is a serious offense. These medications can be rapidly fatal to children, adolescents, or others who do not need the medication. I understand that refills of my prescriptions will be made at the time of an office visit or during regular office hours and never during evenings or weekends when the office is closed. I authorize my provider and my pharmacy to cooperate fully with any city, state and/or federal law enforcement agency in the investigation of any possible misuse, sale, or other diversion of my medications. I agree to submit to a blood or urine test at my cost, if requested by my provider, in order to determine my compliance with my medication program. I understand that the use of these medications may adversely affect my ability to drive, operate machinery, or perform certain tasks or occupations, and I agree, given that risk, not to use these medications under these circumstances. I understand that a healthy lifestyle can be helpful in achieving control of pain, depression, and / or anxiety. I will strive toward smoking cessation, a healthy diet, and exercise as my condition allows. All of my questions and concerns regarding treatment have been adequately answered. A copy of this Agreement will be given to me, and a signed copy will be placed in my medical record. I agree to use pharmacy, and only this pharmacy, for my prescriptions for controlled substances. Overdose death rates were three times greater in non-Hispanic whites and in American Indians and Alaska Natives than in blacks and Hispanic whites. Incidentally, 1999 is the year that several organizations began promoting "pain as the fifth vital sign," with no secondary improvement in the quality of pain management. Drug addiction is very real, and about 15% of patients may be genetically predisposed to addiction; therefore, clinicians should strongly consider this in their risk/benefit analysis before exposing a patient to these powerful medications. Using a tool such as the Opioid Risk Tool may be helpful in determining the risk of addiction in a particular individual. It can be rendered at any point in the course or treatment of illness, whether that illness is life-limiting/ threatening or not. Hydromorphone (Dilaudid) and oxymorphone (Opana) are metabolites of hydrocodone (Lortab, Norco) and oxycodone (Percocet, Endocet, OxyContin), respectively. All states except Missouri have prescription-monitoring programs that allow providers to monitor for the use of multiple providers and pharmacies to obtain controlled medications. A 2015 systematic review and meta-analysis showed mild reductions in pain, but the comparison groups were placebo rather than standard care. Additionally, cannabinoids are not without adverse effects, including impacts on cognition, motivation, and psychosis in a 2016 review. Onysko M, Legerski P, Potthoff J, Erlandson E: Targeting neuropathic pain: Consider these alternatives, J Fam Pract 64(8):470­475, 2015. Medicaid populations are at greater risk of opioid overdose than non-Medicaid populations, and prescription drug overdose death rates are higher in the more rural and impoverished counties. In addition to the deaths, there is a significant cost burden of substance abuse treatment admissions, with the 2008 rates being six times the 1999 rate. By 2010, opioids were sold in such a volume that every American adult could be treated for a month with hydrocodone 5 mg every 4 hours. Long-term safety of opioids has not been demonstrated, and chronic use has been associated with sleep disorders, adrenal suppression, and hypogonadism (and secondary erectile dysfunction and depression). Routine visits are necessary to document ongoing need for and adequate response to the prescribed regimen. Routine drug screening is beneficial for monitoring compliance with the opioid as well as nonopioid medications. However, the provider needs to be aware of the metabolites of the different drugs. Numerous medications in multiple drug classes have been studied for fibromyalgia, but many of the trials are small and/or of poor quality. The use of cannabinoids has become legal in some states; however, their use for the management of pain is somewhat controversial as the studies evaluating these drugs are often of low to modest quality. Negative impacts could be even greater as unintended consequences of medical and/or recreational use come to light. Chou R, Peterson K, Helfand M: Comparative efficacy and safety of skeletal muscle relaxants for spasticity and musculoskeletal conditions, J Pain Sympt Manage 28:140­175, 2004. References 1 Symptomatic Care Pending Diagnosis 42 Antidepressants Tricyclics Amitriptyline 25­100 mg qhs. Selective norepinephrine reuptake inhibitors ­ can be used to improve coexisting anxiety and/or depression. Duloxetine 60 mg/day; >60 mg rarely more effective for pain, but can titrate higher for comorbid anxiety and/or depression if needed Venlafaxine 37. However, the clinician should seek assistance from anesthesiology or palliative care specialists. These forms are used to convert the salient points of advance directives into medical orders so that they are immediately actionable by nurses or emergency medical services if the situation arises. For detailed information on opioids, please see Table 1 in the chapter in Section 1 on pain. Peripheral mu antagonists like methylnaltrexone (Relistor) or naloxegol (Movantik) are indicated for refractory opioid-induced constipation. For uncomplicated nausea, prochlorperazine (Compazine) was found to be superior to promethazine (Phenergan). Opioids, benzodiazepines, and/or other agents, depending upon the situation, might be required. Delirium with or without agitation can occur in up to 80% of patients, depending upon the underlying condition. Medications are common causes, but pain and multiple other conditions can cause it as well. Medications such as haloperidol (Haldol), chlorpromazine (Thorazine, brand discontinued), or olanzapine (Zyprexa, Zyprexa Zydis) can be helpful in many patients, but haloperidol is by far the cheapest alternative and a good place to start. Epidemiology ed Pathophysiology ic in Factors associated with worse pain or less symptom control are being female, elderly or a child, and race other than white. Lacking advance directives and failing to have such discussions with family members are related to receiving excessive and/or unbeneficial interventions/treatments. They are used to convert the salient points of advance directives into medical orders so that they are immediately actionable by nurses, emergency medical services, and others if the situation arises. Therefore, symptoms may have different etiologies and pathophysiology depending on the underlying disease state. Any patient with symptom burden is a candidate for palliative care, whether the symptoms are physical, psychological, spiritual, or existential. The Edmonton Symptom Assessment Scale rates each of 11 different symptoms on a scale of 0 to 3 for a total score of 0 to 33. The Karnovsky and Palliative Performance Scales range from 0% (deceased) to 100% (fully functional) rated on ambulation, activity and evidence of disease, self-care, oral intake, and level of consciousness. Hospice eligibility in the United States is solely based on a life expectancy of 6 months or less if the disease progresses on its expected course. Although not fully validated, the criteria can help guide the clinician in discussions with patients/families. There are various prognostic scoring systems for different disease states, and the Palliative Prognosis Score can help to determine the prognosis for patients with terminal cancer. Additionally, the American Cancer Society has 5-year survival rates for various stages of numerous cancers on its website. Any of these disease processes can have a significant symptom burden that worsens with disease progression. The consequences of failing to plan for the transition to end-of-life care include increased psychological distress, medical treatments that are inconsistent with individual preferences, increased utilization of healthcare resources that have little therapeutic benefit while being very costly in dollars as well as quality of life, and a more difficult bereavement for survivors. Cardiopulmonary resuscitation has poor outcomes under the best of circumstances ($15%), but it is even worse in patients with late-stage cancer with only about 2% surviving to hospital discharge. Common symptoms in palliative care include pain, nausea with or without vomiting, dyspnea, delirium, constipation, dysphagia (cannot swallow food, fluids, or medications), and general functional decline, that is, requiring more assistance with transfers, toileting, and self-care. Anorexia and lack of thirst are very common, notably in the last few hours to days of life, but anorexia can also be a side effect of medications. As patients enter the last hours of life, they might experience decreased level of consciousness, agitated delirium, mottling of the extremities beginning distally and moving proximally, changes in breathing (Cheyne-Stokes, rapid and shallow, Kussmaul, or agonal), decreased or absent oral intake, and/or skin cool to touch. Another example is a nursing home resident with dementia whose family just wants them "to be kept comfortable. When maintaining comfort and improving quality of life become the primary goals, assist patients and their families with the transition to hospice care. Hospice is grossly underutilized with a median length of stay of only 19 days; all of its benefits often cannot be realized in such a short time. Palliative and end-of-life care, like all medical care, needs to be influenced by all four major aspects of medical ethics: autonomy (patient/surrogate has the right to pursue aggressive treatment as well as to refuse treatment, even if that treatment could be considered life-sustaining), beneficence (do "good" for the patient), nonmaleficence ("do no harm"), and justice (appropriate distribution of finite resources). These four ethics can come into conflict at times, especially with the emphasis on autonomy above the other three in the healthcare system in the United States. Hospitals and other medical facilities should have specific policies regarding medical futility. However, when assessing various symptoms, treatment options can be selected based on the probable source. Is the pain new or in a new location, or is it in the same area, radiating, or worsening Are the nausea/vomiting due to chemotherapy, anesthesia, metabolic disorders, bowel obstruction, anxiety, increased intracranial pressure, or something else Is the constipation opioid-induced, due to poor intake, a result of using fiber without adequate fluid intake, or caused by another issue altogether To meet the needs of all forms of suffering (physical, emotional/ psychological, spiritual, existential), an interdisciplinary approach using physicians, nurses, chaplains, counselors, social workers, and others is essential. For all patients entering palliative care, and especially hospice care, all of their medications should be evaluated for risk and benefit and then prioritized based on the goals of care. In one study, patients with a life expectancy of less than 1 year taking a statin for primary or secondary prevention were randomized to continue or stop the statin. The average number of days until death was 229 after discontinuation versus 190 for continuation; thus survival and quality of life improved at a lower cost. Consider discontinuing statins, some oral hypoglycemic agents (notably sulfonylureas due to risk of hypoglycemia), or oral anticoagulants such as warfarin (Coumadin), apixaban (Eliquis), or dabigatran (Pradaxa) if risks now outweigh benefits. As the end of life approaches, discontinue other medications that are not essential for symptom control or quality of life, have more risks than benefits, or contribute to symptom burden. Clinicians might withhold or withdraw treatments, but they should never withdraw "care. Consider turning off the defibrillator component of a pacerdefibrillator to avoid unnecessary shocks. The pacer can remain on as it can improve some symptoms while not prolonging life. For a detailed review of medications used for pain, especially opioids, see the chapter on pain. Pain of All Types Opioids have demonstrated efficacy for cancer-related pain in numerous clinical trials. Methadone can be effective when other opioids have failed, but it should be used with caution and by those familiar with its use. Bone Pain the bone pain due to metastatic lesions is partly due to prostaglandin release; thus coanalgesics like nonsteroidal antiinflammatory drugs or adjuvant medications such as corticosteroids. Bisphosphonates such as zoledronic acid (Zometa) and pamidronate (Aredia) usually provide analgesia within a week that lasts up to 3 months. Additionally, radiopharmaceuticals such as strontium-89 (Metastron), samarium-153 (Quadramet), and phosphorus-32 (Phosphocol P-32) may be helpful for cancer-related bone pain with analgesia usually beginning within 1 to 2 weeks and lasting 2 to 6 months. Their benefit is derived from significant uptake by areas of high bone turnover to provide internal, localized radiation. Radium-223 (Xofigo; indication limited to castrationresistant prostate cancer with bone metastasis) emits alpha radiation rather than the beta radiation of the three agents above, and it is more selective for metastatic lesions.

Repair rather than replacement is the procedure of choice and should be performed at surgical centers experienced with mitral valve repair treatment 001 buy cheap lariam 250mg. In myxomatous mitral valves anima sound medicine purchase lariam in india, the spongiosa layer is expanded by loose treatment jock itch lariam 250 mg order on line, amorphous extracellular matrix that has more proteoglycans but less collagen and more fragmented elastic fibers treatment xerophthalmia lariam 250mg without a prescription. What collagen is present appears to be disorganized and fragmented symptoms kidney disease lariam 250mg generic, giving the appearance of a haphazard layering of the spongiosa. It is this thickening that produces the classic macroscopic appearance of the myxomatous valve on two-dimensional echocardiography. Morphologic features of normal mitral valves (left) and valves with myxomatous degeneration (right). Myxomatous valves have an abnormal layered architecture: loose collagen in fibrosa, expanded spongiosa strongly positive for proteoglycans, and disrupted elastin in atrialis (top). Movat pentachrome stain (collagen stains yellow, proteoglycans blue-green, and elastin black). The classic auscultatory findings include a midsystolic click and a middle- to late-peaking crescendo systolic murmur heard best at the apex. Therefore, the patient should be examined in several positions: supine (including lateral decubitus), sitting, standing, ht tp:// eb oo ks m ed ic in Diagnosis. The most important and most specific finding on auscultation is the presence of a nonejection midsystolic click or clicks caused by snapping of the valve apparatus as parts of the valve leaflets billow into the atrium during systole. Although these clicks can be heard over the entire precordium, they are best heard at the apex. The click can be misinterpreted as a split S1, a true S1 with an S4, or a true S1 with an early ejection click from a bicuspid valve. It can be differentiated from an ejection click heard in bicuspid aortic valves by its timing relative to the beginning of the carotid upstroke. Often, but not always, a middle- to late-peaking crescendo systolic murmur can be appreciated by itself or after a click. Because the mitral apparatus is saddle-shaped, certain echocardiographic views are more specific than others for determining leaflet prolapse. Most practitioners agree that the parasternal long-axis and apical two-chamber or apical long-axis views are the most accurate for determining prolapse. A finding of prolapse as determined on other views, particularly the apical fourchamber view, is much less specific and frequently leads to a false-positive diagnosis. Often the valve can be repaired rather than replaced, with a low operative mortality rate and excellent shortand long-term results when performed at experienced centers. Preservation of the native valve allows for lower risks of thrombosis and endocarditis than does prosthetic valve replacement. Patients who develop palpitations, lightheadedness, dizziness, or syncope should undergo Holter or event monitoring for detection of arrhythmias. Palpitations are frequently controlled with -blockers or calcium channel blockers, although the presence of specific arrhythmias may mandate additional therapy. Prophylaxis is recommended for patients who have undergone repair if prosthetic material was used. Patient outcomes after mitral valve repair are typically very good, and the surgical risk is lower than for many other forms of cardiac surgery, including mitral valve replacement. Levy D, Savage D: Prevalence and clinical features of mitral valve prolapse, Am Heart J 113:1281­1290, 1987. As the folds move medially, they bring along the phrenic nerves, and the root of each fold migrates ventrally. At the end of the fifth week, the pleuropericardial folds fuse, partitioning the thoracic cavity into a pericardial cavity and two partially formed pleural cavities. The pericardium comprises two juxtaposed layers of connective tissue, which form the parietal and the visceral pericardium. It normally contains a very small amount of transudative fluid (approximately 5 mL). Its function is not well established, but it could conceptually minimize friction and trauma to the epicardium during the cardiac cycle. In two series with a total of 331 patients, a specific diagnosis was established in only 54 (16%). The most common causes of pericarditis were neoplasia (20 patients), tuberculosis (13 patients), nontuberculous infection (7 patients), and collagen vascular disease (7 patients). In patients with acute pericarditis for which no cause is identified (idiopathic pericarditis), the etiology is frequently presumed to be viral, but evidence for this is often not pursued, given the expense involved and the time required for the results of viral titers to become available. It is likely that some cases for which an identifiable cause exists are labeled idiopathic as the result of an insufficient diagnostic evaluation. However, complex and exhaustive testing strategies are typically not justified by the limited implications for clinical management. An exception to this recommendation is the absence of a prompt and adequate response to standard treatment. The latter may reveal a layer of echo-free space between the epicardium and the pericardial sac, sometimes associated with fibrin strands, hematoma, or amorphous material deposited around the heart. In a review of 322 patients with a moderate to large pericardial effusion on echocardiography, the most common causes were idiopathic (20%), iatrogenic (16%), malignancy (13%), chronic idiopathic effusion (9%), acute myocardial infarction (8%), uremia or end-stage renal disease (6%), and collagen vascular disease (5%). In a different series, including 75 patients presenting to a tertiary care medical center in the United States with a new, unexplained, large pericardial effusion, a diagnosis was made in 53 patients. The most common causes were malignancy (23%), infection (27%), irradiation (14%), collagen vascular disease (12%), uremia or dialysis (12%), and idiopathic (7%). Examination of pericardial fluid yielded a diagnosis in 26%, mostly of malignancy, whereas examination of pericardial tissue was useful for diagnosis in 23%, mostly with infection. A higher rate of idiopathic disease was found in a review of 204 patients from France; a specific cause was identified in 107 patients (52%). The following distribution was noted: idiopathic (48%), infection (16%), malignancy (15%), collagen vascular disease (10%), hypothyroidism (10%), and renal failure (2%). Classification Classically, pericardial disease has been categorized as inflammatory, neoplastic, degenerative, vascular, or idiopathic. Neoplastic disease may be related to breast, lung, esophagus, lymphoma, melanoma, or renal cell carcinoma. Degenerative disease is related to mediastinal radiation, whether recent or remote. Miscellaneous causes of pericardial disease include cardiac surgery, aortic dissection, cardiac contusion (with recent or remote sharp or blunt chest trauma), iatrogenic causes (usually after cardiac diagnostic or interventional procedures, such as coronary angiography or placement of a pacemaker or defibrillator), metabolic causes (uremia, myxedematous state), and idiopathic causes. The frequencies reported for specific causes of pericardial disease vary significantly in the medical literature, depending on the epidemiology, the population at risk, and how the diagnosis was established. The diagnostic yield of pericardiocentesis or pericardial biopsy is typically higher in patients who are found to have a pericardial effusion than in those who present with apparent acute pericarditis without concomitant effusion. Clinically, most disease processes involving the pericardium manifest with varying degrees of inflammation, constituting the clinical syndrome of pericarditis. In addition, the amount of pericardial fluid may be increased and may result in a pericardial effusion, which can be transudative or exudative and is sometimes hemodynamically significant. Although pericarditis and pericardial effusions are distinct phenomena, both manifestations are present in a large group of patients. In some cases, the clinical presentation of acute pericardial inflammation predominates, and the presence of excess pericardial fluid has no clinical significance. In other cases, the effusion and its clinical consequences, such as hemodynamic instability, are the main pathologic mechanism. Usually, at least two of these features, with or without an accompanying pericardial effusion, should be present for the clinical diagnosis. Cardiomegaly is demonstrated on a chest radiograph; the double-shadow pattern suggests a large pericardial effusion. Other causes of pericardial echo-free spaces that must be considered include pleural effusion, pericardial masses, and epicardial fat. Computed Tomography Effusions are easily detected on computed tomography by virtue of the different x-ray coefficients of fluid and pericardium. The nature of the effusion also may be anticipated, given the different attenuation coefficients for blood, exudates, lipid-rich fluids, and serous fluids. Hemopericardium can be difficult to assess without intravenous contrast, because blood has the same radiodensity as myocardium. Magnetic Resonance Imaging Magnetic resonance imaging is a sensitive technique for detecting pericardial effusion and loculated pericardial effusion and thickening. Cardiac Catheterization Cardiac catheterization can assist in the differentiation between constrictive and restrictive cardiomyopathy. Pericardiocentesis Pericardiocentesis is relatively safe when it is guided by angiography or echocardiography, especially with a large, free anterior effusion. One study reported only 3 minor complications in 117 procedures with ultrasound guidance. Heterogeneous exudates may indicate a potentially difficult pericardiocentesis, especially if the fluid is loculated in pockets-a common finding in autoimmune pericarditis, postsurgical cases, and recurrent disease. In a large study, diagnostic pericardiocentesis led to a diagnosis in only 6% of cases, compared with 29% diagnosed by therapeutic pericardiocentesis. As such, pericardiocentesis should not be performed unless tamponade or suspected purulent pericarditis is present. If a pericardiocentesis is performed for drainage, an indwelling catheter should be placed in the pericardial space for continued drainage over several days. If the catheter continues to drain a large amount, a more definitive procedure should be performed. The pericardial fluid should be analyzed for red cells, total protein level, lactic acid dehydrogenase level, adenosine deaminase activity, and cultures. Pericardial Window In the pericardial window procedure, a small area of the pericardium is resected (usually 10 cm2). In critically ill patients, a balloon catheter may be used to create a pericardial window. In some studies almost 25% of patients who underwent the procedure required repeat operation within 2 years. Constrictive pericarditis may be a long-term complication if pathologic healing affects the 3 the Cardiovascular System 140 Electrocardiography Acute pericarditis classically evolves through stages. The T-wave inversion may persist indefinitely in the chronic inflammation observed with tuberculosis, uremia, or neoplastic processes. Echocardiography Universally recommended, echocardiography should be performed urgently if cardiac tamponade is suspected. Cardiac tamponade occurs when the extracardiac pressure from a large effusion causes collapse of the cardiac chambers during diastole. The collapse occurs in a progressive fashion, with right atrial collapse initially, followed by right ventricular collapse and eventual decrement in the cardiac output once the left-sided chambers are affected. The erythrocyte sedimentation rate and C-reactive protein level are usually elevated, especially if active inflammation is present. Blood urea nitrogen and creatinine levels should also be checked if uremia is suspected. Cardiac biomarkers are part of the diagnostic work-up and are abnormal in cases of associated myocarditis or myocardial infarction. In a recent study, an elevated troponin I level was found in 32% of patients with viral or idiopathic pericarditis. This was related to the extent of myocardial inflammation but was not a negative prognostic marker. Further laboratory work may include blood or viral cultures, tuberculin testing with sputum for acid-fast bacilli, rheumatoid factor, antinuclear antibody, and thyroid function tests. In addition, laboratory and imaging studies may contribute to establishing the diagnosis. Pericardiectomy Pericardiectomy is used for constrictive pericarditis, effusive pericarditis, or recurrent pericarditis with multiple attacks; steroid dependence; or intolerance to other medical management. In selected cases (young patients with no hemodynamic instability and minor clinical symptoms), pericarditis may be managed on an outpatient basis. Complicated cases, such as tuberculous, purulent, or uremic causes, require multidisciplinary involvement, including consultations with a cardiologist, cardiac surgeon, and medical subspecialists. Treatment for specific causes of pericarditis is directed according to the underlying cause. For patients with idiopathic or viral pericarditis, therapy is directed at symptom relief. Ibuprofen has the advantage of fewer adverse effects and fewer negative effects on coronary flow. Galve E, Garcia-del-Castillo H, Evangelista A, et al: Pericardial effusion in the course of myocardial infarction: Incidence, natural history, and clinical relevance, Circulation 73:294­299, 1986. Studies demonstrate that failure rates are proportional to the amount of pericardium removed. In effusive pericarditis, the higher failure rate associated with a pericardial window or partial pericardiectomy is probably secondary to continued fluid production from the remaining pericardium, with sealing of the remaining pericardium to the heart. All patients admitted with suspected or established pericarditis, with or without an effusion, should be monitored by telemetry. Patients without these factors were treated on an outpatient basis, without serious complications after a mean follow-up of 38 months. In another study, the presence of cardiac tamponade and an unfavorable clinical outcome, with persistence of fever, significant pericardial effusion, or general illness lasting longer than 1 week, were highly associated with finding a specific etiology. If significant clinical activity persists for 3 weeks after admission without an etiologic diagnosis, some authors recommend pericardial biopsy. These agents have similar efficacies, with relief of chest pain in 85% to 90% of patients within days of treatment. Indomethacin has a poor adverse effect profile and has been shown to reduce coronary flow. The duration of treatment depends on the clinical course, but common therapeutic courses rarely extend beyond 7 to 10 days. Permanyer-Miralda G, Sagrista-Sauleda J, Soler-Soler J: Primary acute pericardial disease: A prospective series of 231 consecutive patients, Am J Cardiol 56:623­630, 1985. Sagrista-Sauleda J, Merce J, Permanyer-Miralda G, Soler-Soler J: Clinical clues to the causes of large pericardial effusions, Am J Med 109:95­101, 2000.

An entomologist or parasitologist should be consulted if further identification is desired medicine 524 generic lariam 250 mg on line. The diagnosis of specific tick-borne infectious diseases is covered in the respective sections of this book (see Chapters 29 medications metabolized by cyp2d6 buy lariam 250mg lowest price, 32 symptoms chlamydia cheap lariam 250mg visa,34 medicine abbreviations buy lariam master card, and 73) treatment uti infection generic 250 mg lariam free shipping. Treatment, Prevention, and Control Early removal of attached ticks is of primary importance and may be accomplished by steady traction on the tick body, grasped with forceps as close to the skin as possible. Care 77 · Arthropods 801 should be taken to avoid twisting or crushing the tick, which may leave the mouthparts attached to the skin or inject potentially infectious material into the wound. Steady traction is superior to noxious stimuli or occlusive techniques for the removal of ticks. Because ticks may harbor highly infectious agents, the clinician should use appropriate infection-control precautions. Unless the tick is removed quadriplegia and respiratory paralysis may ensue; the case fatality rate without tick removal approaches 10%. Preventive measures used in tick-infested areas include the wearing of protective clothing that fits snugly about the ankles, wrists, waist, and neck so that ticks cannot gain access to the skin. People and pets should be inspected for ticks after visits to tick-infested areas. Although the common housefly does not bite, it certainly is capable of mechanical transmission of a number of viral, bacterial, and protozoan infections to human hosts. The infectious diseases transmitted by bloodsucking flies are well covered in other chapters of this book (see Chapters 29, 73, and 74). The following section deals only with injury resulting from the bite of these insects and the effects of salivary substances introduced into the human skin and tissues. Hexapoda (Insecta) the insects, or hexapods, constitute the largest and most important of all the classes of arthropods, accounting for approximately 70% of all known species of animals. Insects include animals such as mosquitoes, flies, fleas, lice, roaches, bees, wasps, beetles, and moths, to name just a few. The insect body is divided into three parts (head, thorax, and abdomen) and is equipped with one pair of antennae, three pairs of appendages, and one or two pairs of wings or no wings at all. The medical significance of any insect is related to its way of life, particularly its mouthparts and feeding habits. Insects may serve as vectors for a number of bacterial, viral, protozoan, and metazoan pathogens. Certain insects may serve merely as mechanical vectors for the transmission of pathogens, whereas in other insects, the pathogens undergo multiplication or cyclic development within the insect host. Insects can also be pathogens themselves by causing mechanical injury through bites, chemical injury through the injection of toxins, and allergic reactions to materials transmitted by bites or stings. There are more than 30 orders of insects, but only those of major medical importance are discussed in this section. Mosquitoes Physiology and Structure Adult mosquitoes are small and have delicate legs, one pair of wings, long antennae, and greatly elongated mouthparts adapted for piercing and sucking. The two major subfamilies of mosquitoes (Culicidae family), the Anophelinae and the Culicidae, share a number of similarities in their life cycles and development. The females of most species also feed on blood, which they require for each clutch of 100 to 200 eggs. In the act of feeding, the female mosquito injects saliva, which produces mechanical damage to the host but also may transmit disease and produce immediate and delayed immune reactions. Epidemiology Within the subfamily Anophelinae, the genus Anopheles contains the species responsible for the transmission of human malaria. These species vary in their capacity for the transmission of malaria, and within each geographic area, the number of species that serve as malaria vectors is small. Mosquitoes from Aedes, the largest genus of the subfamily Culicidae, are found in all habitats, ranging from the tropics to the Arctic. This species may develop overwhelming populations in marshes, tundra, pasture, or floodwater and have a severe impact on wildlife, livestock, and humans. Clinical Syndromes Mechanical damage induced by the feeding mosquito is usually minor but may be accompanied by mild pain and irritation. The bite is usually followed within a few minutes by a small, flat weal surrounded by a red flare. The delayed reaction consists of itching, swelling, and reddening of the wound region. Treatment, Prevention, and Control Medical attention is usually not sought for a bite unless secondary infection occurs. Local anesthetics or antihistamines may be useful in treating reactions to mosquito bites. Preventive measures in mosquito-infested areas include the use of window screens, netting, and protective clothing. All dipterans have a single pair of functional membranous wings and various modifications of the mouthparts, which have been adapted for piercing the skin and sucking blood or tissue juices. Their most important feature is their role as mechanical or biologic vectors of a number of infectious diseases, including leishmaniasis, trypanosomiasis, malaria, filariasis, onchocerciasis, tularemia, bartonellosis, and the viral encephalitides (see Table 77. The bloodsucking flies include mosquitoes, sandflies, and blackflies, all of which are capable of transmitting diseases to humans. Mosquito-control measures that involve the use of insecticides have been effective in some areas. Gnats and Biting Midges Physiology and Structure Ceratopogonids represent an assortment of tiny flies such as gnats, midges, and punkies. The majority of the flies that attack humans belong to the genus Culicoides; they are minute (0. The females suck blood and typically feed at dusk, when they may attack in large numbers. Epidemiology Biting midges may be important pests in beach and resort areas near salt marshes. Those of the genus Culicoides are the main vectors of filariasis in Africa and the New World tropics. Clinical Syndromes the mouthparts of biting midges are lancet like and produce a painful bite. Treatment, Prevention, and Control Local treatment is palliative, with lotions, anesthetics, and antiseptic measures. The treatment of breeding sites with pesticides and repellents may be useful against some of the common species of these pests. Epidemiology Blackflies are common in Africa and South America, where they serve as vectors of onchocerciasis. In North America, they are common around the lake regions of Canada and the northern United States. In large numbers, they may cause significant blood loss and pose a major threat to wild and domestic animals. Clinical Syndromes A variety of responses have been observed in humans after the bite of blackflies. The bite of the female can tear the skin surface and induce bleeding that continues for some time after the fly has departed. The local reaction may also be accompanied by a systemic response that varies according to the number of bites and the sensitivity of the person. This syndrome is known as blackfly fever and is marked by headache, fever, and adenitis. It usually subsides within 48 hours and is considered a hypersensitivity reaction to the salivary secretions of the fly. In addition to local and systemic responses to blackfly bites, a hemorrhagic syndrome has been described after bites of blackflies in certain areas of Brazil. This syndrome resembles thrombocytopenic purpura and is characterized by local and disseminated cutaneous hemorrhages associated with mucosal bleeding. It is thought that this hemorrhagic syndrome may be produced by a hypersensitivity phenomenon or response to a toxin caused by multiple blackfly bites. Sandflies Physiology and Structure Sandflies, or moth flies, belong to a single subfamily of the Psychodidae, the Phlebotominae. They are small (1 to 3 mm), delicate, hairy, weak-flying insects that suck the blood of humans, dogs, and rodents. Epidemiology Phlebotomine larvae develop in nonaquatic habitats, such as moist soil, stone walls, and rubbish heaps. They also serve as vectors of infectious diseases, such as leishmaniasis in the Mediterranean, the Middle East, Asia, and Latin America. Sandfly fever is characterized by severe frontal headaches, malaise, retroorbital pain, anorexia, and nausea. Treatment, Prevention, and Control Sandflies are very sensitive to insecticides, which should be applied to breeding sites and window screens. Blackflies Physiology and Structure Members of the family Simuliidae are commonly called blackflies or buffalo gnats. They are 1 to 5 mm long, 77 · Arthropods 803 Diagnosis the blackfly bite is characteristically marked by a point of dried blood and subcutaneous hemorrhage at the wound site. In people with the hemorrhagic syndrome, platelet counts are reduced; there is a prolonged bleeding time and poor clot retraction in about half of patients. Treatment, Prevention, and Control Treatment includes the usual palliative measures. Patients with the hemorrhagic syndrome have shown marked improvement with corticosteroid therapy. In the act of biting, the female fly leaves a deep wound, causing blood to flow, which the fly laps up. The stable fly, often mistaken for the housefly, is a true bloodsucker capable of serving as a short-term mechanical vector of a number of bacterial, viral, and protozoal infections. The common housefly represents a host of genera that are nonpiercing or contaminating flies. Because of their living and feeding habits, they mechanically transmit diverse agents to humans. Epidemiology the tsetse fly is found in the eastern and central regions of Africa, where it is of major medical and veterinary importance as the intermediate host and biologic vector of a number of trypanosomes that infect humans and animals. The housefly and stable fly are cosmopolitan in distribution and serve as indicators of poor sanitation. Stable flies commonly lay eggs in moist, decaying vegetable matter, such as grass clippings or compost heaps found in suburban communities. Prevention and Control Control of tsetse fly populations has been problematic because of their widespread distribution in primarily rural and undeveloped areas. The number of myiasis-producing flies and the diversity in lifestyle requirements are enormous. Only the host relations and sites of predilection of some of the more important species are covered in this section. Specific myiasis refers to myiasis caused by flies that require a host for larval development. One important example is the human botfly, Dermatobia hominis, which is found in the humid regions of Mexico and Central and South America. The adult botfly attaches her eggs to the abdomen of bloodsucking flies or mosquitoes, which in turn distribute the eggs while obtaining a blood meal from an animal or human. The larvae develop over 40 to 50 days, during which time a painful lesion known as a warble appears. The resulting lesion may take weeks to months to heal and may become secondarily infected. Semispecific myiasis is caused by flies that normally lay their eggs on decaying animal or plant matter; it develops in a host if entry is facilitated by the presence of wounds or sores. Dermoscopy revealed a central opening surrounded by dilated blood vessels from which a yellowish structure with black barblike spines on the extremity extruded intermittently. This corresponded to the posterior extremity of Dermatobia hominis (human botfly) larva. The lesion was occluded with a double layer of plaster for 24 hours, and the immobile dead larva was removed with forceps and gentle squeezing. The diagnosis of furuncular myiasis should always be considered in every boil-like lesion not responding to ordinary treatment, especially in travelers returning from tropical countries. These flies are worldwide in distribution, and their presence is encouraged by poor sanitation. They occasionally lay their eggs on the open sores or wounds of animals and humans. These flies have a worldwide distribution and normally breed in decomposing matter. They may deposit their larvae on foods that, if ingested, may serve as a source of infection. Flies that produce accidental myiasis have no requirement for development in a host. Accidental infection may occur when eggs are deposited on oral or genitourinary openings and the resulting larvae gain entry into the intestinal or genitourinary tract. Epidemiology Epidemics of head lice are reported frequently in the United States, particularly among schoolchildren. The head lice inhabit the hairs of the head and are transmitted by physical contact or sharing of hair brushes or hats. They are transmitted frequently from one person to another by sexual contact and contaminated toilet seats or clothing. Unlike head or crab lice, they move to the body for feeding and return to the clothing after obtaining a blood meal.

Detection of eggs in urine can be accomplished using direct detection or concentration using the sedimentation centrifugation technique symptoms panic attack buy lariam 250 mg visa. Eggs may be trapped in mucus or pus and are more frequently present in the last few drops of the specimen rather than the first portion symptoms jaundice lariam 250 mg order. The production of Schistosoma eggs fluctuates; therefore examinations should be performed over several days treatment goals for ptsd buy lariam 250 mg low price. Identification is based on wet-mount preparation examinations of vaginal and urethral discharges 911 treatment discount lariam 250 mg on-line, prostatic secretions treatment 3rd stage breast cancer purchase lariam without prescription, or urine sediment. Parasitic Infections of Blood and Tissue Parasites localized within the blood or tissues of the host are more difficult to detect than intestinal and urogenital parasites. Microscopic examination of blood films is a direct and useful means of detecting malarial parasites, trypanosomes, and microfilariae. Unfortunately, the concentration of organisms often fluctuates; thus the collection of multiple specimens over several days is required. The preparation of both wet mounts (microfilariae and trypanosomes) and permanently stained thick and thin blood films is the mainstay of diagnosis. Examination of sputum may reveal helminth ova (lung flukes) or larvae (Ascaris and Strongyloides 70 · Laboratory Diagnosis of Parasitic Disease 705 species) after appropriate concentration techniques. Biopsy of skin (onchocerciasis) or muscle (trichinosis) may be required for the diagnosis of certain nematode infections (see Table 70. Smears and concentrates of cerebrospinal fluid are necessary to detect trophozoites of Naegleria fowleri, trypanosomes, and larvae of the nematode Angiostrongylus cantonensis within the central nervous system. Cerebrospinal fluid must be promptly examined because the trophozoite forms of the protozoan parasites are very labile (trypanosomes) or tend to round up and become nonmotile (N. Examination of tissue impression smears of lymph nodes, liver biopsy material, spleen, or bone marrow stained with Giemsa stain is very useful in detecting intracellular parasites such as Leishmania species and Toxoplasma gondii. Also, biopsies of various tissues are an excellent means of detecting localized or disseminated infections caused by protozoan and helminthic parasites. Saline mounts of superficial skin snips are very useful in detecting the microfilariae of Onchocerca volvulus. Examination of sputum (induced) is indicated when there is a question of pulmonary paragonimiasis (lung fluke) or abscess formation with E. The optimal time for obtaining blood for parasitologic examination varies with the particular parasite expected. Because malaria is one of the few parasitic infections that can be acutely life-threatening, blood collection and examination of blood films should be performed immediately if the diagnosis is suspected. Laboratories offering this service should be prepared to do so on a 24-hour basis, 7 days a week. Because the levels of parasitemia may be low or fluctuating, it is recommended that repeat blood films be obtained and examined at 6, 12, and 24 hours after the initial sample. Detection of trypanosomes in blood is occasionally possible during the early acute phase of the disease. Trypanosoma cruzi (Chagas disease) may also be detected during subsequent febrile periods. After several months to a year, the trypomastigotes of African trypanosomiasis (T. Two types of blood films are prepared for the diagnosis of blood parasite infections, thin and thick. Although wetmount preparations of blood films can be examined for motile parasites (microfilariae and trypanosomes), most laboratories proceed directly to the preparation of thick and thin films for staining. In the thin film, the blood is spread over the slide in a thin (single cell) layer, and the red blood cells remain intact after fixation and staining. In the thick film, the red cells are lysed before staining, and only the white blood cells, platelets, and parasites (if present) are visible. Thick films allow a larger amount of blood to be examined, which increases the possibility of detecting light infections. Unfortunately, increased distortion of the parasites makes species identification using the thick film particularly difficult. Proper use of this technique usually requires a great deal of expertise and experience. Occasionally, other blood-concentration procedures may be used to detect light infections. Alternative concentration methods for detecting blood parasites include the use of microhematocrit centrifugation, the examination of buffy coat preparations, a triple centrifugation technique for the detection of low numbers of trypanosomes, and a membrane filtration technique for the detection of microfilariae. The most dependable staining of blood parasites is obtained with Giemsa stain buffered to pH 7. Giemsa stain is particularly useful for the staining of protozoa (malaria and trypanosomes); however, the sheath Alternatives to Microscopy In the majority of cases, the diagnosis of parasitic disease is made in the laboratory by microscopic detection and morphologic identification of the parasite in clinical specimens. In some cases, the parasite cannot be detected despite a careful search because of low or absent levels of organisms in readily available clinical material. In such cases, the clinician may need to rely on alternative methods based on the detection of parasite-derived material (antigens or nucleic acids) or by the host response to parasitic invasion (antibodies). Additional approaches used in selected infections include culture, animal inoculation, and xenodiagnosis. The majority of these serologic tests are based on the detection of specific antibody responses to the presence of the parasite. Antibody detection is useful and indicated in the diagnosis of many protozoan diseases. In contrast to antibody detection, the measurement of circulating parasite antigen in serum, urine, or feces may provide a more appropriate marker for the presence of active infection and also may indicate parasite load. Also, demonstrations of specific parasite antigen in lesion fluid, such as material from an amebic abscess or fluid from a hydatid cyst, may provide a definitive diagnosis of the infecting organism. Several commercial assays for the detection of parasite antigens are now available in kits. Several antigen detection tests also are available for detection of blood parasites (malaria, filariasis) in conjunction with microscopic examination of thick and thin blood smears. The advantages to these approaches are labor savings and a potential increase in sensitivity. Indeed, numerous studies have shown that immunoassays are more sensitive than microscopic examination in detecting infections caused by Giardia and Cryptosporidium. The disadvantages are the loss of parasitologic expertise and the fact that, in some instances, the available assay tests are for only a single organism, whereas conventional microscopic examination provides the opportunity to recognize many different parasites. Although antigendetection assays have been described for many other parasites, they are not widely available. The availability of a broad panel of antigen-detection assays potentially would make the use of an antigen screen a viable alternative to tedious microscopic examination. Nucleic acid­based methods can be used to detect parasites not only in clinical samples of blood, stool, or tissue from infected patients but also in their natural vector. Molecular testing is becoming more readily available for most diagnostic laboratories. Intestinal gastrointestinal panels are available that can test simultaneously for multiple gastrointestinal pathogens, including bacterial, viral, and parasitic pathogens. As with antigen detection, only select pathogens can be detected, and other pathogens may be missed. Irrespective of the assay format, nucleic acid probes and amplification techniques are now used on a routine basis for the detection and identification of numerous species and strains, including Plasmodium species, Leishmania species, T. The widespread use of these techniques requires further development of simple procedures for sample handling and preparation and will require extensive clinical and field testing before they can be applied broadly to aid in clinical diagnosis. However, culture of other parasites has not been successful or is too difficult or cumbersome to be of practical value in routine diagnostic efforts. This approach takes advantage of the fact that all organisms contain nucleic acid sequences that may be used in a hybridization assay to distinguish among strains, species, and genera. Thus parasites may be simultaneously detected and identified in clinical material depending on the specificity of the molecular method used. Although useful, this approach is not practical for most diagnostic laboratories and is largely confined to research settings. Classically, this approach was used to diagnose Chagas disease by allowing an uninfected reduviid bug to feed on an individual suspected of having the disease. Subsequently, the bug was dissected and examined microscopically for evidence of developmental stages of T. Although this technique may be used in endemic areas, it is obviously not practical for most diagnostic laboratories. Molecular testing for clinical diagnosis and epidemiological investigations of intestinal parasitic infections. Why is it important to understand the life cycle of parasites when diagnosing parasitic diseases What factors may confound the use of microscopy in the diagnosis of parasitic disease Describe the important considerations in collecting and submitting a fecal specimen for parasitologic examination. What are the alternatives to microscopy for the diagnosis of parasitic infections Consequently, many antiparasitic agents act on pathways (nucleic acid synthesis, carbohydrate metabolism) or targets (neuromuscular function) shared by both the parasite and the host. For this reason, developing safe and effective antiparasitic drugs based on biochemical differences between the parasite and host has been difficult. Differential toxicity is commonly achieved by preferential uptake, metabolic alteration of the drug by the parasite, or differences in the susceptibility of functionally equivalent sites in the parasite and host. Fortunately, as our understanding of the basic biology and biochemistry of parasites and the mechanism of action of antimicrobial agents has improved, so has our recognition of potential parasite-specific targets for chemotherapeutic attack. Increasingly, investigators are exploiting newly completed genome projects for protozoan parasites to identify potential drug targets for high-throughput screening. Examples of the chemotherapeutic strategies that exploit the differences between parasite and host are provided in Table 71. The chemotherapeutic approach to the management of infectious diseases has clearly changed the face of medicine. Unfortunately, few of the antiinfective agents that have proved so successful against bacterial pathogens have been effective against parasites. In many instances, clinicians continue to rely on antiparasitic agents from the preantibiotic era. These and some newer agents remain limited in effectiveness and are relatively toxic. Many antiparasitic agents require prolonged or parenteral administration and may be effective only in certain disease states. Fortunately, in the last several years, new agents have appeared that constitute significant advances in the treatment of parasitic diseases. In large part, the difficulties in the treatment of parasitic diseases stem from the fact that parasites are eukaryotic organisms and thus are more similar to the human host than the more successfully treated prokaryotic bacterial pathogens. Furthermore, the chronic and prolonged course of infection, the complex life cycles, and multiple developmental stages of many parasites add to the difficulties of effective chemotherapeutic intervention. Although chemotherapeutic approaches may be used effectively to treat and prevent many parasitic infections, some agents have adverse effects or eventually meet with resistance (microbial and social). Most antiparasitic agents are too expensive for widespread use in resource-poor countries. Thus the global approach to the prevention and treatment of parasitic diseases must involve several strategies, including improved hygiene and sanitation, control of the disease vector, access to point-of-care diagnostic testing, use of vaccinations if available (largely unavailable for parasitic diseases), and prophylactic and therapeutic administration of safe and effective chemotherapy. Of note, large-scale chemotherapy administered one to three times per year in endemic regions has reduced transmission of, and morbidity and mortality from, certain infections, including lymphatic filariasis, onchocerciasis, schistosomiasis, and intestinal nematodes. Unfortunately, our understanding of the molecular and genetic basis for resistance to most antiparasitic agents is quite limited. Greater understanding of the epidemiology and mechanisms of drug resistance can provide valuable guidance for a better use of existing compounds and for the development of novel agents. The use of molecular markers of drug resistance has added another dimension to surveillance efforts and generated insights into the global spread of drug resistance in both protozoa and helminthes. Molecular markers have been identified for Plasmodium falciparum resistance to chloroquine, sulfadoxine-pyrimethamine, atovaquone-proguanil, and, to a limited degree, other antimalarials. Trypanosomes Antiparasitic Agents Although the number of effective antiparasitic agents is small relative to the vast array of antibacterial agents, the list is expanding (Table 71. Certainly, a primary goal of antiparasitic therapy is similar to that of antibacterial therapy, which is to eradicate the organism rapidly and completely. In many cases, however, the agents and treatment regimens used for parasitic diseases are designed simply to decrease the parasite burden, to prevent the systemic complications of chronic infection, or to carry out both actions. Thus the goals of antiparasitic therapy, particularly as applied in endemic areas, may be quite different from those usually considered for therapy of microbial infection in the United States or other developed countries. Given the significant toxicity of many of these agents, in every case, the need for treatment must be weighed against the toxicity of the drug. A decision to withhold therapy may often be correct, particularly when the drug can cause severe adverse effects. Immunocompromised individuals pose a particular problem with respect to antiparasitic chemotherapy. On the one hand, prophylaxis, such as that administered for toxoplasmosis, may be effective in preventing infection. However, once infection is established, radical cure may not be possible, and long-term suppressive therapy may be indicated. In some diseases, such as cryptosporidiosis and microsporidiosis, effective (curative) therapy is not readily available, and care must be taken to avoid unnecessary toxicity while providing supportive care for the patient.

Stool pH and electrolytes may be helpful medicine urology buy 250 mg lariam amex, especially when the patient is lactose intolerant medicine 93 3109 cheap 250mg lariam with mastercard. Testing for Diagnosis to diarrhea medications not covered by medicaid purchase lariam in united states online, a trial of discontinuation of offending substance/food may be reasonable medications 3 times a day lariam 250 mg purchase with amex. The effectiveness of probiotics1 looks favorable; however medicine look up drugs buy lariam mastercard, large intervention studies and epidemiologic investigations of long-term probiotic effects on healthy adults are largely missing. Dietary modification continues to be an important starting point for treatment with increased intake in bulk forming agents such as fiber. Clinical Gastroenterology, Diarrhea: Diagnostic and Therapeutic Advances, New York, 2010, Humana Press, Springer. Morphologically, cirrhosis reflects the consequences of chronic hepatic necroinflammatory activity with an incomplete and disorganized repair process that results in regenerative nodules and extensive fibrosis replacing normal hepatic parenchyma with disturbance of normal hepatic physiology. Activation of hepatic stellate cells into myofibroblasts and matrix deposition are key steps in the pathogenesis of cirrhosis. Epidemiology the prevalence of cirrhosis varies significantly in different regions of the world and is directly influenced by the epidemiology of individual chronic liver diseases that lead to progressive hepatic fibrosis. Serum anti-tissue transglutaminase antibody testing may be helpful if symptoms are suggestive of celiac sprue. Stool evaluation may include fecal occult blood testing, fecal leukocytes, stool ova and parasites, stool culture (including Salmonella, Shigella, and Campylobacter), and stool antigen for Giardia. Stool testing for Cryptosporidium should be considered, especially in the immunocompromised. Similarly, it is difficult to obtain accurate estimates of mortality related to cirrhosis, but countries in Central and South America and Southern Europe exhibit the highest mortality rates, particularly in males. Epidemiologic trends of cirrhosis have changed considerably over time in many countries, underscoring variations in the incidence and prevalence of specific etiologies of chronic liver disease. Alcohol consumption has varied strikingly across different regions of the globe over the past several decades. If there is concern of possible bacterial or protozoa infection, an empiric trial of vancomycin (Vancocin), ciprofloxacin (Cipro), or metronidazole (Flagyl) may be warranted. Juckett G, Trivedi R: Evaluation of chronic diarrhea, Am Fam Physician 84:1119­1126, 2011. Soriano M, Vaziri H: Clinical Gastroenterology, Diarrhea: Diagnostic and Therapeutic Advances, New York, 2010, Humana Press, Springer. Natural history and prognostic indicators of survival in cirrhosis: A systematic review of 118 studies. A similar trend has also been noted in North America; however, hospitalizations for alcoholic hepatitis have increased over the recent past in the United States. In contrast, a significant increase in mortality related to cirrhosis has been noted in some Eastern European countries with increased alcohol consumption. Compensated cirrhosis implies the absence of index complications such as jaundice, ascites, hepatic encephalopathy, or gastroesophageal variceal hemorrhage. In contrast, hepatic decompensation indicates an advanced phase of the disease, which is rapidly progressive and characterized by development of one or more complications and diminished hepatocellular function with prolongation of the prothrombin time and hypoalbuminemia. Characterizing cirrhosis as compensated or decompensated is simple and reproducible, and offers useful prognostic information for clinical practice (Table 2). Clues to the presence of cirrhosis can include elevated serum aminotransferases and/or bilirubin, decreased albumin, and prolongation of the prothrombin time. Approximately 10% to 17% of individuals with unexplained elevation of aminotransferases have unrecognized cirrhosis. Thrombocytopenia in the absence of a primary hematologic explanation is another clue to the presence of cirrhosis and primarily reflects hypersplenism due to portal hypertension but also diminished production of thrombopoietin, a platelet growth and development factor synthetized by the liver. A platelet count below 160 Â 10/L provides the highest diagnostic accuracy for cirrhosis amongst routine blood tests (sensitivity 74%, specificity 88%, positive likelihood ratio 6. Physical examination may reveal somewhat diminished liver span by percussion and a firm liver edge on palpation. Splenomegaly is suggested by dullness to percussion in the left upper abdominal quadrant or a palpable spleen tip. Cutaneous signs of cirrhosis include palmar erythema, spider nevi, facial telangiectasia, decreased chest and/or axillary hair, inversion of the normal male pubic hair pattern, Terry nails ("ground glass" appearance of nails with absent lunula), and Muehrcke nails (paired, white, transverse bands separated by normal color). Nail clubbing may also be present in individuals with cirrhosis, particularly in those with hepatopulmonary syndrome. Dupuytren contracture is relatively common in alcoholic cirrhosis but its pathogenesis is not well understood. Palmar erythema due to altered sex hormone metabolism is more evident on the thenar and hypothenar eminences and typically spares the central portion of the palm. Hypogonadism in both sexes and gynecomastia and testicular atrophy in males can be detected, reflecting altered sex hormone metabolism (increased production of androstenedione, enhanced aromatization to estrone, and increased conversion to estradiol). The catabolic effects of advanced cirrhosis often result in marked sarcopenia, which adversely affects quality of life and survival and is also associated with poorer outcomes after liver transplantation. This gradient is calculated by subtracting the ks m ed ic Major complications of cirrhosis in. Effective antiviral therapy can abort progression of chronic viral hepatitis to cirrhosis and decompensation. Although cirrhosis per se is not an indication for liver transplantation, it is important to identify individuals with cirrhosis who should be considered for liver transplantation. Development of an index complication of cirrhosis such as gastroesophageal variceal hemorrhage, ascites, or hepatic encephalopathy is an indication to refer a patient for liver transplantation and initiate pretransplant evaluation. Gastroesophageal Variceal Hemorrhage Portal hypertension leads to formation of multiple portosystemic collaterals, including gastroesophageal varices. Gastroesophageal varices are present in approximately 50% of patients with cirrhosis and are more common in patients with hepatic decompensation (Child-Turcotte-Pugh class C). Variceal hemorrhage is the most dramatic complication of cirrhosis and occurs at a rate of 5% to 15% per year. Risk factors for variceal hemorrhage include larger variceal size, more advanced hepatic decompensation, and presence of vascular "red wale" signs during endoscopic evaluation. Esophageal varices are classified according to their size as small (5 mm) or large (>5 mm). Management strategies for patients with esophageal varices that have not previously bled (primary prophylaxis) are summarized in Table 4. Gastric varices are classified according to relationship with esophageal varices and location (Table 5). Acute variceal hemorrhage occurs at a yearly rate of 5% to 15% and is associated with high mortality (at least 20% at 6 weeks). Adequate resuscitation is crucial in acute variceal hemorrhage with some additional precautions. Patients with variceal hemorrhage are at high risk for aspiration, and endotracheal intubation for airway protection should be performed prior to endoscopy. Overly aggressive expansion of blood volume should be avoided as it may result in increased portal venous pressure. Unfortunately, accurate noninvasive measurement of portal pressure is not available, limiting its use in routine clinical practice as it requires passage of a transjugular catheter. Increased intrahepatic resistance to portal venous flow aggravated by increased splanchnic blood flow in cirrhosis leads to portal hypertension. In addition to cirrhosis, which is the most common cause of portal hypertension in Western countries (hepatic schistosomiasis is the leading cause in areas where this infection is common), other disorders may result in pre- or posthepatic portal hypertension. Cardiomyopathy, constrictive pericarditis, Budd-Chiari syndrome, and inferior vena cava webs may result in posthepatic portal hypertension. Ascites and gastroesophageal variceal hemorrhage are the two most common complications of portal hypertension in cirrhosis. Less common but clinically significant complications include portal hypertensive gastropathy, hepatic hydrothorax, hepatopulmonary syndrome, portopulmonary hypertension, and hepatorenal syndrome. Administration of vasoactive drugs such as octreotide (Sandostatin)1 or terlipressin (Lucassin)5 result in increased rates of initial endoscopic control of bleeding but have no effect on overall patient survival. Other relevant mechanisms include splanchnic vasodilatation and its consequences such as humorally mediated sodium retention and diminished free water excretion by the kidneys, hypoproteinemia and reduced oncotic pressure, and disruption of normal lymphatic drainage in the liver due to extensive fibrosis. Ascites can be demonstrated by physical examination when its volume is greater than 1500 mL, although ultrasonography can detect as little as 100 mL. Clinical signs include flank dullness on percussion, shifting dullness, and, if the amount of ascites present is large, demonstration of a fluid wave. Cirrhotic ascites is unlikely to resolve without specific therapeutic intervention. Management of ascites is centered on sodium restriction rather than free water restriction; total dietary intake of sodium should be less than 2000 mg (88 mmol) per day and compliance with this intervention can be documented by monitoring urinary sodium concentrations. A sodium-to-potassium concentration ratio of greater than 1 on a random urine sample correlates well with a 24-hour sodium excretion greater than 78 mmol/day and implies compliance with sodium restriction. Nevertheless, dietary restriction of sodium is efficacious in only 10% of patients and enhanced natriuresis is typically needed to provide adequate control of ascites. Combining diuretics that work at different sites of the nephron is more effective than using a single agent. Aldosterone is upregulated in cirrhosis owing to diminished effective arterial blood volume and consequential increased renin and angiotensin activity, resulting in enhanced renal sodium and free water retention. Spironolactone (Aldactone) competitively inhibits aldosterone-dependent sodium-potassium exchange in the distal convoluted renal tubule and the collecting ducts. The recommended initial dose of spironolactone for patients with ascites due to portal hypertension is 100 mg orally daily. Administration of a loop-acting diuretic such as furosemide (Lasix)1 is recommended in addition to spironolactone as it potentiates natriuresis. Further increases in doses of diuretics should be made maintaining this 100/40 ratio to a maximum dose of 400 mg orally daily of spironolactone and 160 mg orally daily of furosemide, as it prevents hypo- or hyperkalemia. Renal function and electrolytes must be monitored regularly, particularly after dose modifications. Tender gynecomastia is an unpleasant side effect of spironolactone, and some patients may need to discontinue it, in which case amiloride (Midamor)1(10­40 mg orally daily) can be used. Aerobic and anaerobic blood culture bottles should be inoculated at the bedside to avoid contamination and to increase diagnostic yield. For patients allergic to beta-lactams, alternatives include fluoroquinolones such as levofloxacin (Levaquin),1 although this agent exhibits less penetration into the ascitic fluid compared with a third-generation cephalosporin. Renal dysfunction is commonly encountered in patients with cirrhosis, particularly in those with hepatic decompensation. In addition, nonalcoholic steatohepatitis is characterized by a high prevalence of type 2 diabetes mellitus and systemic hypertension; thus patients are at increased risk for diabetic and hypertensive nephropathies. The physiologic effects of intravenous infusion of albumin include increased oncotic pressure with consequential expansion of the effective arterial blood volume, as well as its ability to bind a wide range of endogenous and exogenous ligands including bacterial lipopolysaccharides, reactive oxygen species, nitric oxide and other nitrogen reactive species, and prostaglandins, thus modulating the inflammatory response. Specifically, this therapy should be reserved for high-risk individuals such as those with serum creatinine greater than 1 mg/ dL, blood urea nitrogen greater than 30 mL/dL, or total serum bilirubin greater than 4 mg/dL. Recommended antibiotic prophylaxis for patients hospitalized with gastroesophageal variceal hemorrhage include ceftriaxone1 1 g intravenously daily; once the patient is able to tolerate oral antibiotics, this may be changed to trimethoprim/sulfamethoxazole1 one double-strength tablet orally daily, ciprofloxacin (Cipro)1 500 mg orally daily, or norfloxacin1 400 mg orally twice daily for a total of 7 days of antibiotic therapy. Plasma volume expansion with administration of intravenous albumin1 at a dose of 1 g/kg of body weight (up to a maximum of 100 g/day) to increase renal perfusion is recommended. Renal ultrasonography is also recommended as it provides good assessment for chronic parenchymal changes that may suggest the presence of a chronic underlying renal disease and accurately rules out obstructive nephropathy. There is continuing controversy about its exact pathogenesis, but gut-derived toxins, including ammonia, are clearly implicated. The psychometric hepatic encephalopathy score is regarded as the gold standard, but additional assessments include the number connection test, computerized tests such as the inhibitory control test, the cognitive drug research battery, and electroencephalogram. These tests, however, are not applicable in routine clinical practice and usually require consultation with a specialist. Blood ammonia levels lack sensitivity and specificity and correlate poorly with the severity of encephalopathy. Although the exact mechanism responsible for its therapeutic efficacy is still unclear, this agent is degraded by colonic microbiota to short-chain organic acids, resulting in acidification of the intestinal lumen and increased conversion of absorbable ammonia to nonabsorbable ammonium. The cathartic effects of nonabsorbable disaccharides may result in profuse diarrhea, dehydration, and hypernatremia. For these patients, endovascular techniques aimed at decreasing the size of the shunt should be considered. Liver transplantation offers definitive therapy for patients with end-stage liver disease, resulting in restoration of hepatic synthetic function and resolution of complications associated with portal 1 7 ht tp:// eb oo ks m ed ic in. However, residual cognitive impairments may persist following liver transplantation, adversely impacting healthrelated quality of life. Regions of the world with intermediate to high incidence of this malignancy (more than 3 cases per 100,000 persons per year) include Asia, sub-Saharan Africa, and Western Europe. Additional features include presence of a capsule and interval growth of the lesion when previous imaging studies are used for comparison. Physical examination may demonstrate jugular venous distention and lower extremity edema, the latter typically being out of proportion to the severity of ascites. Cardiopulmonary auscultation usually reveals normal clear breath sounds throughout both lung fields, an accentuated pulmonic component of the second heart sound, and a systolic murmur located along the left sternal border that is accentuated with inspiration (tricuspid regurgitation). Chest radiographs may demonstrate right ventricular enlargement and a prominent pulmonary artery. Locoregional therapies include radiofrequency ablation, percutaneous ethanol injection, transarterial chemoembolization, radioembolization, and microwave ablation. Furthermore, active surveillance is recommended to evaluate for tumor recurrence or progression, development of new lesions, and metastatic disease while awaiting liver transplantation. Clinical manifestations include dyspnea of insidious onset and two characteristic clinical findings: platypnea and orthodeoxia (worsening dyspnea and hypoxemia in upright posture, respectively).

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References

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