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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.

Despite efforts to arrive at a diagnosis, the cause of infarction in a discouragingly large number of cases remains undetermined. Some cases may be unexplained because no appropriate laboratory studies are performed, while others are due to the improper timing of the appropriate laboratory studies. The most frequent circumstances are when normal or ambiguous findings are reached despite appropriate laboratory studies performed at the appropriate time. Results from the Stroke Data Bank indicated that large artery atherosclerotic occlusive disease was a less frequent cause of stroke; small vessel or lacunar and cardioembolic infarction were relatively frequent; and that the cause for the majority of the cases of infarction could not be classified into these traditional diagnostic categories. This forced the creation of a separate diagnostic category for cases whose mechanisms of infarction remained unproven, one known as ‘infarct of undetermined cause’ or ‘cryptogenic infarction.’
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Cases categorized as cryptogenic infarction have no bruit or TIA ipsilateral to the hemisphere affected by stroke, no obvious history suggestive of cardiac embolism and usually do not present with a lacunar syndrome. The CT or MRI scan performed within seven days may be normal, show an infarct limited to a surface branch territory or may show a large zone of infarction affecting regions larger than that accounted for by a single penetrant arterial territory. Viagra soft tabs canada. Non-invasive vascular imaging fails to demonstrate an underlying large vessel occlusion or stenosis. No cardiac source of embolism is uncovered by echocardiography, electrocardiography or Holter monitor. If an angiogram is performed, the study may be normal, show a distal branch occlusion or occlusion of a major cerebral artery stem, or the top of the basilar. Because these latter occlusions can be from embolus or thrombosis of an atherosclerotic vessel, their demonstration does not settle the mechanism. Image results for echocardiography

Many of these cases present with a hemispheral syndrome, a surface infarction by CT or MRI and a corresponding branch occlusion documented by angiography or normal angiogram. This constellation of findings has been considered suggestive of embolism. There is ample evidence for many occult sources of emboli, the difficulty proving their existence, and their role in the first or succeeding ischemic strokes. Emerging technologies have led to the suggestions that some cryptogenic infarcts may be explained by hematologic disorders causing hypercoagulable states from Protein C, free Protein S, Lupus anticoagulant or anti-cardiolipin antibody abnormalities. Others have implicated paradoxical emboli through a patent foramen ovale and aortic arch atherosclerosis.

Small vessel, Lacunar Infarction
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These strokes have distinctive clinical syndromes with a small zone of ischemia confined to the territory of a single vessel. They are understood to reflect arterial disease of the vessels penetrating the brain to supply the internal capsule, basal ganglia, thalamus, corona radiata and paramedian regions of the brainstem. There are disagreements about the pathogenesis of lacunar infarcts with some favoring the use of the term “lacune” to describe size and location without indicating a specific pathology. Only a handful have been pathologically studied by serial section and documented a tiny focus of microatheroma or lipohyalinosis stenosing one of the deep penetrating arteries. The arterial damage is usually the result of long-standing hypertension or diabetes mellitus. Less common causes include stenosis of the middle cerebral artery stem or micr0embolization to penetrant arterial territories. The vast majority of radiologically-defined, small’, deep infarcts do not have significant large artery atherosclerosis, lack even a potential cardiac source of embolism and occur in vascular territories less likely to be occluded by emboli.
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Many lacunar strokes are diagnosed by clinical characteristics alone. Clinical syndromes include pure motor hemiparesis, pure sensory, clumsy hand dysarthria, ataxic hemiparesis and sensorimotor stroke. When brain imaging is positive, a strategically placed small, deep infarct is usually found. Because the vascular lesion lies in small vessels, it is no surprise that cerebral angiography is normal. Incidental large vessel disease may be found in some series, but whether etiologically related to the site of infarction is often unclear.