Items in AFP with MESH term: Platelet Aggregation Inhibitors
Are Anticoagulants Better than Antiplatelet Agents for Treatment of Acute Ischemic Stroke? - Cochrane for Clinicians
Antiplatelet Therapy and Anticoagulation in Patients with Hypertension - Cochrane for Clinicians
Drug-Eluting Coronary Artery Stents - Article
ABSTRACT: Many advances have been made in the percutaneous treatment of coronary artery disease during the past 30 years. Although balloon angioplasty alone is still performed, the use of coronary artery stents is much more common. Approximately 40 percent of patients treated with balloon angioplasty developed restenosis, and this was reduced to roughly 30 percent with the use of bare-metal stents. However, restenosis within the stent can occur and is difficult to treat. Drug-eluting stents were developed to lower the rate of restenosis, which now occurs in less than 10 percent of patients treated with these stents. There have been concerns about abrupt thrombosis within drug-eluting stents occurring late after their implantation, leading to acute myocardial infarction and death. Recent studies have alleviated, but not completely dispelled, these concerns. Strict adherence to dual antiplatelet therapy with aspirin and a thienopyridine is required after stent placement, and the premature discontinuation of therapy is the most important risk factor for acute stent thrombosis. Adequate communication between cardiologists and primary care physicians is essential not only to avoid the premature discontinuation of therapy, but also to identify, before stent placement, those patients in whom prolonged antiplatelet therapy may be ill-advised. Elective surgery following stent placement should be delayed until the recommended course of dual antiplatelet therapy has been completed.
ABSTRACT: Coronary artery disease is the leading cause of mortality in the United States. In patients who have had a myocardial infarction or revascularization procedure, secondary prevention of coronary artery disease by comprehensive risk factor modification reduces mortality, decreases subsequent cardiac events, and improves quality of life. Options for secondary prevention include medical therapy and surgical revascularization in the form of coronary artery bypass grafting or percutaneous coronary intervention. Medical therapy focuses on comprehensive risk factor modification. Therapeutic lifestyle changes (including weight management, physical activity, tobacco cessation, and dietary modification) improve cardiac risk factors and are universally recommended by evidence-based guidelines. Treatment of hypertension and dyslipidemia reduces morbidity and mortality. Recommendations for persons with diabetes mellitus generally encourage glucose control, but current evidence has not shown reductions in mortality with intensive glucose management. Aspirin, angiotensin-converting enzyme inhibitors, and beta blockers reduce recurrent cardiac events in patients after myocardial infarction. Surgical revascularization by coronary artery bypass grafting is recommended for those with significant left main coronary artery stenosis, significant stenosis of the proximal left anterior descending artery, multivessel coronary disease, or disabling angina. Percutaneous coronary intervention may be considered in select patients with objective evidence of ischemia demonstrated by noninvasive testing.
Perioperative Antiplatelet Therapy - Article
ABSTRACT: Aspirin is recommended as a lifelong therapy that should never be interrupted for patients with cardiovascular disease. Clopidogrel therapy is mandatory for six weeks after placement of bare-metal stents, three to six months after myocardial infarction, and at least 12 months after placement of drug-eluting stents. Because of the hypercoagulable state induced by surgery, early withdrawal of antiplatelet therapy for secondary prevention of cardiovascular disease increases the risk of postoperative myocardial infarction and death five- to 10-fold in stented patients who are on continuous dual antiplatelet therapy. The shorter the time between revascularization and surgery, the higher the risk of adverse cardiac events. Elective surgery should be postponed beyond these periods, whereas vital, semiurgent, or urgent operations should be performed under continued dual antiplatelet therapy. The risk of surgical hemorrhage is increased approximately 20 percent by aspirin or clopidogrel alone, and 50 percent by dual antiplatelet therapy. The present clinical data suggest that the risk of a cardiovascular event when stopping antiplatelet agents preoperatively is higher than the risk of surgical bleeding when continuing these drugs, except during surgery in a closed space (e.g., intracranial, posterior eye chamber) or surgeries associated with massive bleeding and difficult hemostasis.
ABSTRACT: Clinical trials conducted during the past five years have yielded important results that have allowed us to refine our approach to stroke prevention. Treatment of isolated systolic hypertension prevents stroke and is generally well tolerated. New antiplatelet agents (clopidogrel and the combination of aspirin plus high-dose dipyridamole) have been shown to be effective in reducing vascular events in survivors of ischemic stroke, although aspirin remains the mainstay of antiplatelet therapy for stroke prevention. Several clinical trials support the benefit of lipid-lowering agents ("statins") in reducing stroke. Warfarin reduces stroke for high-risk patients with atrial fibrillation. Carotid endarterectomy is highly beneficial in reducing stroke for symptomatic patients with severe carotid stenosis (greater than 70 percent), but the benefit is less for symptomatic patients with a moderate degree of stenosis (50 to 69 percent) and for patients with asymptomatic carotid disease of any severity.
ABSTRACT: Peripheral arterial occlusive disease occurs in about 18 percent of persons over 70 years of age. Usually, patients who have this disease present with intermittent claudication with pain in the calf, thigh or buttock that is elicited by exertion and relieved with a few minutes of rest. The disease may also present in a subacute or acute fashion. Symptoms of ischemic rest pain, ulceration or gangrene may be present at the most advanced stage of the disease. In most cases, the underlying etiology is atherosclerotic disease of the arteries. In caring for these patients, the primary care physician should focus on evaluation, risk factor modification and exercise. The physician should consider referral to a vascular subspecialist when symptoms progress or are severe. While the prognosis for the affected limb is quite good, patients with peripheral arterial occlusive disease are at increased risk of myocardial infarction and stroke. Therefore, treatment measures should address overall vascular health.
Perioperative Cardiac Risk Reduction - Article
ABSTRACT: Cardiovascular complications are the most common cause of perioperative morbidity and mortality. Noninvasive stress testing is rarely helpful in assessing risk, and for most patients there is no evidence that coronary revascularization provides more protection against perioperative cardiovascular events than optimal medical management. Patients likely to benefit from perioperative beta blockade include those with stable coronary artery disease and multiple cardiac risk factors. Perioperative beta blockers should be initiated weeks before surgery and titrated to heart rate and blood pressure targets. The balance of benefits and harms of perioperative beta-blocker therapy is much less favorable in patients with limited cardiac risk factors and when initiated in the acute preoperative period. Perioperative statin therapy is recommended for all patients undergoing vascular surgery. When prescribed for the secondary prevention of cardiovascular disease, aspirin should be continued in the perioperative period.
Effective Therapies for Intermittent Claudication - FPIN's Clinical Inquiries
ABSTRACT: Proton pump inhibitors effectively treat gastroesophageal reflux disease, erosive esophagitis, duodenal ulcers, and pathologic hypersecretory conditions. Proton pump inhibitors cause few adverse effects with short-term use; however, long-term use has been scrutinized for appropriateness, drug-drug interactions, and the potential for adverse effects (e.g., hip fractures, cardiac events, iron deficiency, Clostridium difficile infection, pneumonia). Adults 65 years and older are more vulnerable to these adverse effects because of the higher prevalence of chronic diseases in this population. Proton pump inhibitors administered for stress ulcer prophylaxis should be discontinued after the patient is discharged from the intensive care unit unless other indications exist.