doi: 10.1161/01.STR.0000014773.57733.3E
(Stroke. 2002;33:1321.)
© 2002 American Heart Association, Inc.
Original Contributions |
Subarachnoid Hemorrhage
A Preventable Disease With a Heritable Component
From the Departments of Neurology (B.M.K., L.S., D.W., J.C., J.B.), Environmental Health (J.K., R.S.), and Emergency Medicine (A.P., E.J.), University of Cincinnati College of Medicine; Institute for Health Policy and Health Services Research, University of Cincinnati (C.J.M.); Molecular Diagnostics Laboratory (R.F.), Cincinnati, Ohio; and Department of Neurology (J.G.), University of Pittsburgh, Pittsburgh, Pa
Correspondence to Brett Kissela, MD, University of Cincinnati, Department of Neurology, 231 Albert Sabin Way, ML 0525, Cincinnati, OH 45267-0525. E-mail kisselbm{at}uc.edu
Background and Purpose— Subarachnoid hemorrhage (SAH) caused by ruptured intracranial aneurysm affects approximately 16 000 Americans annually, and almost 40% of affected patients die within 30 days despite the best current therapy. Prevention of SAH is therefore of paramount importance. We present a preliminary analysis of risk factors for SAH from our population-based, case-control study.
Methods— Cases were prospectively collected and matched 2:1 by age, race, and gender to controls using random digit dialing. Personal risk factor history, family history, neuroimaging data, and genetic samples were obtained. Univariate and bivariate analyses were performed and population-attributable risks estimated. Multivariable analysis was performed using conditional logistic regression.
Results— Between June 1997 and February 2000, 107 cases and 197 controls were enrolled. In bivariate analyses, a large proportion of population-attributable risk for SAH could be explained by modifiable risk factors: smoking, hypertension, and heavy alcohol use. In multivariable analysis, current cigarette smoking, history of hypertension, frequent alcohol use, lower body mass index, and a family history of a relative with SAH or intracranial aneurysm were found to be significant, independent risk factors for SAH.
Conclusion— Our data confirm previous reports that SAH clusters within some families independent of environmental risk factors, suggesting that SAH has a significant genetic component. Yet, even among families at increased risk of SAH, smoking cessation, treatment of hypertension, and reduced alcohol intake may substantially decrease SAH risk. The independent associations with heavy alcohol use and low body mass index with SAH may be confounded by smoking and require further study.
Key Words: risk factors • stroke • subarachnoid hemorrhage
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