(Stroke. 1999;30:1991-1994.)
© 1999 American Heart Association, Inc.
AHA Scientific Statement |
| Introduction |
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There is substantial evidence from observational epidemiological
studies and clinical trials that recurrent ischemic stroke can
be prevented (Table 1
). Control of risk
factors is important for prevention of a first stroke and is practical
after ischemic stroke and TIA have occurred. Identification of
the specific ischemic stroke mechanism, eg, TIA or minor stroke
ipsilateral to a moderate or severe internal carotid stenosis,
guides decision making with regard to recurrent stroke prevention
therapy (Table 2
). A patient with
symptomatic cerebrovascular disease is likely to have other
cardiovascular diseases or is predisposed to develop
them. Preventive measures should complement reduction in risk of
atherothrombotic events in the coronary arteries and other
arterial territories. Certain nonmodifiable characteristics
identify persons at high risk of stroke and stroke recurrence.
These include advancing age, male sex, and black and Hispanic
race-ethnic backgrounds. Some risk factors, however, such as elevated
blood pressure, cigarette smoking, obesity, impaired glucose tolerance,
and physical inactivity, are modifiable. Other conditions, ie, prior
cardiovascular diseases such as coronary heart
disease with angina or prior myocardial infarction, valvular
heart disease, congestive heart failure, atrial fibrillation, increased
left ventricular mass, and certain other
echocardiographic abnormalities, identify persons at
increased risk who may be treated with antithrombotic therapy. More
recently, other modifiable risk factors for stroke have been
identified. These are elevated total and low-density lipoprotein (LDL)
cholesterol in patients with prior coronary heart
disease and elevated plasma homocysteine levels.
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| Prevention |
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In patients with TIA or mild stroke and symptoms referable to severe (70% to 99%) carotid artery stenosis (or to moderate [50% to 69%] stenosis in a patient with significant risk factors), the treatment of choice is carotid endarterectomy by a surgeon with a low complication rate (morbidity and mortality <6%).3 4 For patients with TIA or mild stroke who do not have atrial fibrillation or moderate-to-severe carotid stenosis, treatment with a daily dose of 50 to 325 mg of aspirin is of demonstrated benefit. Although previous studies used doses of aspirin up to 1300 mg/d, the lower dose range is currently recommended.5 Other antiplatelet agents, including clopidogrel, extended-release dipyridamole plus aspirin, and ticlopidine, may be used. Recent retrospective postmarketing surveillance6 suggests that the use of ticlopidine with aspirin after coronary angioplasty and stenting was complicated by thrombotic thrombocytopenic purpura approximately once in every 4184 patients and was fatal in >20% of cases. In light of these findings, the use of ticlopidine must be reassessed.
| Likelihood and Consequences of Stroke Recurrence |
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More than 50% of stroke survivors have significant residual physical disability and functional impairment.12 Stroke recurrence not only may add to physical impairment and disability but may also increase mortality and length of hospital stay.7 In addition, stroke recurrence may lead to vascular dementia or may be an important trigger for dementia in the elderly.13 14 15 Because some first and recurrent strokes are preventable, vascular-associated causes of cognitive impairment might be prevented by appropriate risk-prevention measures.
| Prevention of Other Cardiovascular Outcomes in Cerebrovascular Patients |
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The reduction of LDL cholesterol with 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase inhibitors ("statins") prevents coronary events in patients with coronary artery disease (CAD), especially when LDL cholesterol is elevated. Consequently, stroke patients with known CAD and elevated LDL cholesterol are often prescribed a statin. The value of reducing high blood LDL cholesterol for stroke prevention has been less clear. However, recent trials in patients with CAD16 17 18 have shown treatment with statins prevents stroke as well. Because many stroke patients have clinical CAD, statin use is indicated. Statin use in stroke patients without prior CAD may also reduce the risk of stroke recurrence, as well as myocardial infarction and other vascular disease, but this has not been demonstrated. Additional studies of statins in stroke patients without clinical CAD are in progress.
| Educational Aspects |
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2 years
after the results of 3 randomized trials became available indicating
that endarterectomy was efficacious in selected
symptomatic patients with high-grade carotid artery
stenosis, the operation was reported as being always or often
recommended by only about half of internists and noninternist primary
care physicians in the United States for patients with newly
symptomatic disease.20 Less than 33% of the
latter physicians indicated that they were considering or expecting to
alter their practices.21 Although there are several
possible explanations for this finding, targeted dissemination of
clinical trial results might help address this apparent "knowledge
gap" and be an important vehicle for change.
In contrast, the majority of physicians in the United States are
knowledgeable regarding the use of anticoagulants in the prevention of
cardiogenic embolism in patients with atrial
fibrillation.22 Yet several recent
studies22 23 show that anticoagulants are prescribed to
only
50% of individuals in the United States with atrial
fibrillation who are candidates for such therapy. In this case, there
is a discrepancy between knowledge and practice that is unlikely to be
addressed by reiterating the results of clinical trials. As illustrated
by these examples, the optimal methods of translating evidence into
effective clinical practice may differ depending on a variety of
factors. Systematic study of these factors and the careful assessment
of the impact of possible solutions on both the process of care and
patient outcomes will be increasingly required in the future. Overall,
healthcare organizations need to develop systems that ensure that
patients at high risk for stroke are identified, screened, and treated
appropriately.
| Footnotes |
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| References |
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