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Frequency and pathogenesis of hemodynamic stroke

C F Bladin1, B R Chambers

  • 1Stroke Research Unit, University of Toronto, Canada.

Stroke
|November 1, 1994
PubMed
Summary

Hemodynamic stroke, characterized by hypotension, affects nearly 10% of ischemic stroke patients, often causing watershed infarction. Identifying cardiac and carotid disease is crucial for managing this condition.

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Area of Science:

  • Neurology
  • Cardiovascular Medicine
  • Radiology

Background:

  • Hemodynamic stroke is a recognized but poorly understood cause of ischemic stroke.
  • Understanding its frequency and mechanisms is essential for patient management.

Purpose of the Study:

  • To define the frequency and pathogenic mechanisms of hemodynamic stroke.
  • To identify clinical and CT scan features for early diagnosis.

Main Methods:

  • Prospective study of 300 acute ischemic stroke patients.
  • Exclusion of patients with probable or possible thromboembolic sources.
  • Assessment for hemodynamic mechanisms, including hypotension and carotid artery disease.

Main Results:

  • 9.6% of patients (29/300) had hypotension at stroke onset, with 93% showing watershed infarction on CT.
  • Predominant causes of hypotension included myocardial infarction, arrhythmias, and orthostatic changes.
  • Significant carotid artery disease (stenosis or occlusion) was present in 66% of patients with hypotension.

Conclusions:

  • Clinical and CT features of hemodynamic stroke aid in early identification.
  • Management should focus on cardiac and carotid disease and correcting iatrogenic hypotension.
  • Timely intervention may reduce the risk of recurrent ischemic events.

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