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Risk factors for ischemic stroke: a prospective study in Rochester, Minnesota.

P H Davis1, J M Dambrosia, B S Schoenberg

  • 1Neuroepidemiology Branch, National Institute of Neurological and Communicative Disorders and Stroke, Bethesda, MD.

Annals of Neurology
|September 1, 1987
PubMed
Summary
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This study identified key risk factors for ischemic stroke in individuals over 50. Definite hypertension and transient ischemic attacks significantly increased stroke risk, highlighting the importance of managing these conditions.

Area of Science:

  • Neurology
  • Epidemiology
  • Cardiovascular Medicine

Background:

  • Stroke is a leading cause of disability and death.
  • Identifying modifiable risk factors is crucial for stroke prevention.

Purpose of the Study:

  • To identify and quantify risk factors for first ischemic stroke in a cohort of older adults.
  • To analyze the impact of time-dependent risk factors on stroke occurrence.

Main Methods:

  • A 13-year follow-up study of 1,804 residents of Rochester, Minnesota, aged 50+ and stroke-free at baseline.
  • Utilized a proportional hazards model with time-dependent risk factors to analyze stroke incidence.
  • Assessed 8 risk factors: age, sex, hypertension, transient ischemic attacks, hypertensive heart disease, coronary heart disease, congestive heart failure, and diabetes mellitus.

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Main Results:

  • Significant risk factors for ischemic stroke included age (per 10 years, RR=1.6), male sex (RR=2.0), definite hypertension (RR=4.0), and transient ischemic attacks (RR=3.9).
  • Other contributing factors were hypertensive heart disease (RR=2.2), coronary heart disease (RR=2.2), congestive heart failure (RR=1.7), and diabetes mellitus (RR=1.7).
  • Atrial fibrillation was not found to be a significant risk factor in this time-dependent multivariate analysis.

Conclusions:

  • Definite hypertension and prior transient ischemic attacks are potent risk factors for ischemic stroke in individuals over 50.
  • Effective management of hypertension and prompt evaluation of TIA symptoms are critical for stroke prevention strategies.