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A.Acute sinusitis The most commonly identified organisms in children with acute sinusitis are Streptococcus pneumoniae in 30% to 40%, Haemophilus influenzae in 20% to 25%, and Moraxella catarrhalis in 20%. In adults, S. pneumoniae and H. influenzae are the two leading causes of acute sinusitis, whereas Moraxella is unusual. Anaerobic organisms are primarily identified in cases of acute sinusitis originating from dental root infections, but are otherwise uncommon. Hospital-acquired sinusitis is most often seen as a complication of nasogastric tube placement, and is typically caused by gram-negative enteric organisms, such as Pseudomonas and Klebsiella species. B.Chronic sinusitis 1. Bacteria cultured from children with persistent symptoms are usually the same as those seen in acute disease. In children with more severe and protracted symptoms, anaerobic species (such as Bacteroides) and staphylococci are cultured more frequently. In adults with refractory symptoms, Staphylococcus epide...

All patients with mechanical valves require warfarin therapy. The risk of embolism is greater with a valve in the mitral position (mechanical or biological) than in the aortic position. With either type of prosthesis or valve location, the risk of emboli is higher in the first few days and months after valve insertion. Low-dose aspirin is recommended for all patients with prosthetic valves (see Table 1. For patients with mechanical valves, the addition of low-dose aspirin (80 to 100 mg/d) to warfarin therapy (INR 2.0 to 3.5) not only further decreases the risk thromboembolism but also decreases mortality due to other cardiovascular diseases. A slight increase in risk of bleeding with this combination should be kept in mind. Recommendations for Antithrombotic Therapy in Patients With Prosthetic Heart Valves Class I 1.First 3 months after valve replacement: Warfarin- INR 2.5 to 3.5 2.3 or more months after valve replacement: A. Mechanical valve AVR and no risk factor*: Bileaflet valve or...

SYMPTOMS AND SIGNS Type 1 diabetes Increased urination is a consequence of osmotic diuresis secondary to sustained hyperglycemia. This results in a loss of glucose as well as free water and electrolytes in the urine. Thirst is a consequence of the hyperosmolar state, as is blurred vision, which often develops as the lenses are exposed to hyperosmolar fluids. Weight loss despite normal or increased appetite is a common feature of type 1 when it develops subacutely. The weight loss is initially due to depletion of water, glycogen, and triglycerides; thereafter, reduced muscle mass occurs as amino acids are diverted to form glucose and ketone bodies. Lowered plasma volume produces symptoms of postural hypotension. Total body potassium loss and the general catabolism of muscle protein contribute to the weakness. Paresthesias may be present at the time of diagnosis, particularly when the onset is subacute. They reflect a temporary dysfunction of peripheral sensory nerves, which clears as in...

PATHOLOGY Detailed histological studies of pancreatic tissue are available from a limited number of cases of human acute pancreatitis. A histological spectrum of acute pancreatitis is recognized ranging from mild, interstitial disease to coagulation necrosis. 3 Interstitial pancreatitis may lead to local and systemic complications but is rarely fatal; necrotizing pancreatitis may be fatal in up to 30% of cases. Interstitial In interstitial pancreatitis the gland is edematous, but its gross architecture is preserved. Parenchymal inflammatory cells are present together with interstitial edema. Disruption of the normal acinar cell architecture is common and may contribute to the reduced enzyme secretion characteristic of acute pancreatitis. Zymogen granules are displaced from their fusion site in the apical domain of the cell and become dispersed throughout the cell, and the apical membrane appears contracted and microvilli disappear. 4 Zymogen granules fuse with each other instead of the...

Treatment Because myocardial damage progresses rapidly during the early hours, efforts during this critical period must be directed toward reducing myocardial oxygen demand and improving coronary blood supply to diminish the extent of myocardial damage. To be maximally effective, these interventions must be initiated as soon as possible: The reduction in benefit is very time-dependent, and patients who are treated within an hour fare significantly better than those treated later. Thus, prompt reperfusion therapy via primary angioplasty or thrombolytic therapy should be initiated in the absence of contraindications as early as possible in patients with ST elevation acute infarctions. It is now becoming clear that urgent treatment also reduces the morbidity associated with non-Q wave infarctions as well, especially if followed by definitive intervention on the infarct related artery. A. EMERGENCY CARE AND PROTOCOLS More than 85% of patients who present with ST elevation within 4 h of the...

Clinical Findings The clinical presentations of patients with AMI vary. Although most patients have had chest discomfort prior to the onset of infarction, 20% or more have infarction as a first manifestation of ischemic heart disease; in 20–30% of patients, infarction may go unrecognized. Nonetheless, symptoms are generally present. A. SYMPTOMS AND SIGNS The most common and best symptom on which to base a consideration of MI is chest discomfort, usually described as “pressure,” “dull,” “squeezing,” “aching,” or “oppressive,” although it may be described differently because of individual variability, differences in articulation or verbal abilities, or concomitant disease processes. The discomfort is usually in the center of the chest and may radiate to the left arm or the neck. In general, patients with ischemic chest pain tend to be still, but patients with infarction can be restless as well. The nature of the pain may lead patients to place a hand over the sternum (Levine’s sign)...

It is generally accepted that a prolonged imbalance between myocardial oxygen supply and demand leads to the death of myocardial tissue. Coronary atherosclerosis is an essential part of the process in most patients. Ischemic heart disease seems to progress through a process of plaque rupture that transiently increases the amount of luminal impingement by the stenotic lesion. Infarction may occur when the plaque ruptures and leads to thrombosis, erosion of the plaque causes thrombosis, or when cardiac work exceeds the ability of the narrowed coronary artery to supply nutritive perfusion. Recent work suggests that inflammation may play a pivotal role in the genesis of plaque rupture. Greater numbers of acute infarctions occur during the early morning hours (from 6:00 AM to 12:00 noon) than any other time of the day, suggesting that perhaps the increased catecholamine secretion associated with awakening or circadian changes in coagulation common in the early morning (eg, increases in type...