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Clinical trials analyzing the relationship of lipid lowering strategies and stroke have yet to confirm a reduction in risk for patients with TIA or stroke. For TIA and stroke-free subjects, a recent meta-analysis of 16 trials of lipid lowering using the new statin agents has found significant reductions in stroke risk. A 29% reduced risk of stroke and a 22% reduction in overall mortality was found. Secondary prevention trials showed a 32% stroke risk reduction and primary trials a 20% reduction. In the Scandinavian Simvastatin Survival Study there was a significant reduction in fatal and nonfatal stroke among persons treated with hypercholesterolemia, as well as a clear reduction in total mortality and cardiac events. Viagra jelly online is used in male patients with sexual disorders like ED. Lipid lowering strategies may be most beneficial in preventing those strokes attributed to atherosclerosis. Some clinical trials have demonstrated some exciting results regarding carotid plaque regression with lipid-lowering agents. The Asymptomatic Carotid Artery Plaque Study used serial carotid ultrasound measurements and demonstrated that control of modest elevations of LDL will retard the progression of asymptomatic carotid atherosclerotic plaque. Thus, observational and clinical trial data provide mounting support for the role of lipoproteins as precursors of carotid atherosclerosis and ischemic stroke, and the potential benefits of cholesterol lowering in stroke reduction. Patients with cholesterol above 200 and cardiovascular risk factors, should have a complete lipid panel and may require cholesterol lowering regimens.

Carotid Endarterectomy for Asymptomatic Carotid Stenosis

The efficacy of carotid endartectomy in asymptomatic carotid stenosis has been evaluated in three separate clinical trials: CASANOVA (Carotid Artery Stenosis with Asymptomatic Narrowing: Operation Versus Aspirin), Veterans Administration Asymptomatic Carotid Endartectomy Study, and ACASS (Asymptomatic Carotid Artery Surgery Study). While CASANOVA found no confirmatory data to support carotid endartectomy for treatment of asymptomatic carotid disease, this trial excluded all cases with high grade stenosis greater than 90%. The Veterans Administration trial confirmed a decrease in neurological events, specifically transient ischemic attack (outcomes reduced from 20% to 8%), associated with the carotid endartectomy treatment group versus the medical treatment group, but no significant reduction for ipsilateral stroke.
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Patients eligible for ACASS were under age 80 with asymptomatic carotid stenosis greater than 60% and could not have any unstable cardiac disease. Centers were screened for the accuracy of carotid Duplex Doppler in detecting carotid stenosis greater than 60% and the expertise of the operating surgeons with established surgical morbidity and mortality of less than 3%. Overall, the 30-day ipsilateral stroke or death rate among the surgically treated patients was only 2.3%. The trial found a 5-year ipsilateral stroke risk of 10.5% among the medical group and 4.8% in the surgical group. There was a 55% risk reduction of ipsilateral stroke associated with carotid endarectomy. The benefit for men was greater than for women (risk reduction 69% vs. 16%). Further subgroup analyses are pending. Among those patients with asymptomatic carotid stenosis greater than 60% who have an acceptably low risk of operative complications, endarterectomy confers a significant reduction in stroke risk as long as the surgeon can maintain the operative risk below 3%.

Measures which are effective in reducing the incidence of cardiac disease could lead to a reduction in stroke incidence. Anti-platelet agents have proven efficacy in the reduction of nonfatal myocardial infarction in primary prevention studies. Beta-blockers have been shown to reduce the risk of myocardial infarction. Warfarin appears beneficial in the prevention of cardiogenic embolism among patients with acute anterior wall myocardial infarction, left atrial or ventricular thrombus, and prosthetic valvular replacements.
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Seven recent clinical trials have demonstrated the superior therapeutic effect of warfarin compared to placebo in the prevention of thromboembolic events among patients with nonvalvular atrial fibrillation. The relative risk reduction of stroke ranged from 42% to 86%. Warfarin use was relatively safe with major bleeding rates ranging from 0.8% to 2.1%. These trials also showed that there was a modest risk reduction of stroke among those treated with aspirin. SPAF m demonstrated that warfarin with an INR of 2-3 was far superior to ASA and mini-dose warfarin with an INR < 1.5 in the prevention of stroke among high-risk patients with nonvalvular atrial fibrillation.
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The recommendation from the Third American College of Chest Physicians Consensus Conference on Antithrombotic Therapy was that “long-term oral warfarin therapy (INR 2.0-3.0) be User] in patients with atrial fibrillation who are eligible for anticoagulation, except in patients less than 60 years of age who have no associated cardiovascular disease.” It has been estimated that for every 1000 patients with nonvalvular atrial fibrillation treated with warfarin for 1 year, 35 thromboembolic events can be prevented at a cost of 1 major bleed.

There are very few studies which have documented that treatment of hypertension will decrease the risk of stroke occurrence after TIA or stroke recurrence after minor stroke. Numerous prospective studies and clinical trials, however, have consistently shown a decreased risk of stroke with control of mild, moderate, and severe hypertension in all age groups of stroke-free subjects. A meta-analysis of 9 prospective studies including 420,000 individuals followed for 10 years found that stroke risk increased by 46% for every 7.5mm Hg increase in diastolic blood pressure. This analysis disclosed a graded relationship with no low threshold. A subsequent meta-analysis of 14 treatment trials including 37,000 unconfounded randomized individuals followed for a mean of 5 years confirmed the expected reduced stroke risk. The analysis showed a mean diastolic reduction of 5-6mm Hg with a corresponding 35-40% reduction in stroke incidence. This reduced risk was identified regardless of the level of the index diastolic pressure. The authors here concluded that antihypertensive therapy should be prescribed for all moderate hypertensives with high stroke risk. Even a slight improvement in the control of hypertension could translate into a substantial reduction in stroke frequency.
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In addition to the above meta-analysis, individual trials have also made significant contributions to our knowledge of the relationship between hypertension control and stroke risk. The STOP-Hypertension program (Swedish Trial in Old Patients with Hypertension) followed 1,627 randomized hypertensive patients aged 70 to 84 years for an average 25 months. This study indicated the benefit of managing hypertension in the elderly, finding a significant decline in stroke morbidity and mortality, as well as in total mortality. The SHEP (Systolic Hypertension in the Elderly Program) trial randomized 4,736 individuals over age 60 with isolated systolic hypertension (SBP > 160ram Hg with DBP < 90mm Hg) and followed for 4.5 years. The resulting 36% reduction in total stroke incidence confirmed the significance of managing isolated systolic hypertension, a condition affecting two-thirds of elderly hypertensives. In absolute terms, these two trials indicated that treating only 10-20 patients for five years will prevent one major cardiovascular event. From this data, we can infer that the proper control of hypertension after a TIA or stroke will confer a reduced stroke risk.
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Asymptomatic carotid artery disease, which includes nonstenosing plaque or carotid stenosis, is frequent and increases with age, occurring in 53.6% of subjects 65 to 94 years of age. Among individuals with asymptomatic carotid disease, the annual stroke risk was 1.3% in those with stenosis of 75% or less and 3.3% in those with stenosis of more than 75%, with an ipsilateral stroke risk of 2.5%. The combined TIA and stroke risk was 10.5% per year in those with more than 75% carotid stenosis. The occurrence of symptoms may be dependent on the severity and progression of the stenosis, the adequacy of collateral circulation, the character of the atherosclerotic plaque, and the propensity to form thrombus at the site of the stenosis.
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Transient ischemic attacks are a strong predictor of subsequent stroke with annual stroke risks of 1% to 15%. The first year after a TIA is associated with the greatest stroke risk. In hospital-referred patients, the average annual risk of stroke, myocardial infarction or death was 7.5% after TIA. Amaurosis fugax or transient monocular blindness (TMB) had a better outcome than cerebral ischemic attacks and stroke usually occurred in the same vascular territory as-the initial TIA.

Risk Factor Modification
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Risk factor modification may be attempted either through the “high risk approach” which identifies and seeks to modify the degree of risk in individuals with increased risk of disease; or through a “mass” approach which targets modification of risk factors detectable through the screening of large populations. Gorelick has estimated the potential savings, in lives and dollars, associated with either a “mass” or “high risk” prevention program. Based on the estimated prevalence of risk factors and their attributable risks for stroke in the United States, it is estimated that 246,500 strokes could be prevented from the control of hypertension alone and associated with a savings of $12.33 billion. A prevention program aimed at cigarette smoking could prevent over 61,000 strokes with an associated savings of over $3 billion. Even if these programs were only 25% successful in reducing hypertension and smoking, over $3.8 billion may be saved in stroke related care. Treatment of atrial fibrillation and modification of heavy alcohol use could eliminate 47,000 and 23,500 strokes, respectively.

Atherosclerosis and microangiopathy of the coronary, peripheral and cerebral arteries are frequently a complication of diabetes. The relative risk of ischemic stroke ranges from 1.5 to 3.0 and probably depends on the type and severity of the diabetes. Recent cohort studies have demonstrated an independent effect of diabetes even after controlling for other stroke risk factors.
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Abnormalities of serum lipids, triglyceride, cholesterol, low-density lipoprotein (LDL), and high-density lipoprotein (HDL) are regarded as risk factors, more for coronary artery disease than cerebrovascular disease. Degree and progression of carotid atherosclerosis have been found to be directly related to cholesterol and LDL, and inversely related to HDL. Most recently, high serum lipoprotein(a) was found to be a risk factor in a group of patients with early onset of cerebral infarction. The absence of a consistent significant relationship between cholesterol and stroke may be partially explained by the recognition that there are multiple stroke subtypes which are not all attributed to atherosclerosis.
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Cigarette smoking has been clearly established as a biologically plausible, independent determinant of stroke. In case-control studies the effect of cigarette smoking remained significant after adjustment for other factors, and a dose-response relationship was apparent. In cohort studies, cigarette smoking was an independent predictor of ischemic stroke. For different stroke types, the stroke risk attributed to cigarette smoking was greatest for subarachnoid hemorrhage, intermediate for cerebral infarction, and lowest for cerebral hemorrhage.

The role of alcohol as a stroke risk factor is controversial. Results ranged from a definite independent effect in both men and women, an effect only in men, and no effect after controlling for other confounding risk factors such as cigarette smoking. The various mechanisms through Which the risk of stroke may be increased include hypertension, hypercoagulable states, cardiac arrhythmias, and cerebral blood flow reductions. Order cheap spermamax at online canadian pharmacy. However, there is also evidence that light to moderate drinking can increase HDL-cholesterol and reduce the risk of coronary artery disease. A J-shaped relationship between alcohol and stroke has been observed with an elevated stroke risk for moderate to heavy alcohol consumption and a protective effect in light drinkers when compared to non-drinkers. In Northern Manhattan, heavy alcohol use was associated with an increased risk of stroke recurrence within 5 years of ischemic stroke even after controlling for hypertension and hyperglycemia.

Nonmodifiable stroke risk factors include age, gender, heredity, and ethnicity. There is an exponential increase in incidence of stroke with age, and the majority of strokes occur in persons over 65 years of age. Men have a greater stroke incidence than women, but women often live long enough to experience stroke and, therefore outnumber men in some stroke studies. A history of maternal stroke appears to be another gender-related risk factor. Stroke mortality among African-Americans is double that of white Americans. The incidence of stroke has been found to be greater in African-Americans, but further study is needed to assess the importance of referral and selection biases, confounding risk factors, and differential access to medical care. Little information is available regarding the rapidly growing Hispanic population.
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Major reductions in stroke morbidity and mortality are more likely to arise from identification and control of modifiable factors in the stroke-prone individual. Modifiable stroke risk factors include: hypertension, cardiac disease (particularly atrial fibrillation), diabetes, hypercholesterolemia, asymptomatic carotid stenosis, cigarette use, alcohol abuse, and transient ischemic attacks.

Hypertension, after age, is the most powerful stroke risk factor. It is prevalent in the US population in both men and women, and is of even greater significance in African-Americans. The risk of stroke rises proportionately with increasing blood pressure. Isolated systolic hypertension is increasingly prevalent with age and increases the risk of stroke by 2 to 4, even after controlling for age and diastolic blood pressure. Since the attributable stroke risk for hypertension (proportion of strokes explained by hypertension) ranges from 35% to 50% depending on age, even a slight improvement in the control of hypertension could translate into a substantial reduction in stroke frequency.
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Cardiac disease has been clearly associated with an increase in the risk of ischemic stroke. Since certain stroke risk factors, like hypertension, may also be determinants of cardiac disease, some cardiac conditions may be viewed as intervening events in the causal chain for stroke. Cardiac factors which have been documented to independently increase the risk of stroke include: atrial fibrillation, valvular heart disease, myocardial infarction, coronary artery disease, congestive heart failure, electrocardiographic evidence of left ventricular hypertrophy, and perhaps mitral valve prolapse. It should also be noted that chronic atrial fibrillation is a major predictor of stroke, accounting for 7% to 30% of all strokes in patients over age 60. When atrial fibrillation was associated with rheumatic valvular heart disease, Framingham Study investigators found an 18-fold rise in stroke incidence; nonvalvular atrial fibrillation conferred nearly a 5-fold greater risk. Improved cardiac imaging has led to the increased detection of potential stroke risk factors: mitral valve prolapse, mitral annular calcification, patent foramen ovale (PFO), aortic arch atherosclerotic disease, atrial septal aneurysms, and spontaneous echo contrast (a smokelike appearance in the left cardiac chambers visualized on transesophageal echocardiography). Cardiac care information.