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© 2005 by the American Diabetes Association, Inc.
Pathophysiology/Complications |
Epidemiology of Ischemic Stroke in Patients With Diabetes
The Greater Cincinnati/Northern Kentucky Stroke Study
1 Department of Neurology, University of Cincinnati, Cincinnati, Ohio
2 Department of Environmental Health, University of Cincinnati, Cincinnati, Ohio
3 Jewish Hospital, Louisville, Kentucky
Address correspondence and reprint requests to Brett M. Kissela, MD, Department of Neurology, University of Cincinnati, 231 Albert Sabin Way, ML 0525, Cincinnati, OH 45267-0525. E-mail: Brett.Kissela{at}uc.edu
OBJECTIVE— Diabetes is a well known risk factor for stroke, but the impact of diabetes on stroke incidence rates is not known. This study uses a population-based study to describe the epidemiology of ischemic stroke in diabetic patients.
RESEARCH DESIGN AND METHODS— Hospitalized cases were ascertained by ICD-9 discharge codes, prospective screening of emergency department admission logs, and review of coroner’s cases. A sampling scheme was used to ascertain cases in the out-of-hospital setting. All potential cases underwent detailed chart abstraction by study nurses followed by physician review. Diabetes-specific incidence rates, case fatality rates, and population-attributable risks were estimated.
RESULTS— Ischemic stroke patients with diabetes are younger, more likely to be African American, and more likely to have hypertension, myocardial infarction, and high cholesterol than nondiabetic patients. Age-specific incidence rates and rate ratios show that diabetes increases ischemic stroke incidence at all ages, but this risk is most prominent before age 55 in African Americans and before age 65 in whites. One-year case fatality rates after ischemic stroke are not different between those patients with and without diabetes.
CONCLUSIONS— Given the "epidemic" of diabetes, with substantially increasing diabetes prevalence each year across all age- and race/ethnicity groups, the significance of diabetes as a risk factor for stroke is becoming more evident. Diabetes is clearly one of the most important risk factors for ischemic stroke, especially in those patients less than 65 years of age. We estimate that 37–42% of all ischemic strokes in both African Americans and whites are attributable to the effects of diabetes alone or in combination with hypertension.
Abbreviations: GCNKSS, Greater Cincinnati/Northern Kentucky Stroke Study • MI, myocardial infarction • PAR, population-attributable risk • TIA, transient ischemic attack
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