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Prolonged hypoperfusion and early stroke after transient ischemic attack.

J Bogousslavsky1, A Delaloye-Bischof, F Regli

  • 1Department of Neurology, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland.

Stroke
|January 1, 1990
PubMed
Summary
This summary is machine-generated.

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Transient ischemic attacks (TIAs) can precede strokes. Some TIAs show reduced brain blood flow (hypoperfusion) on imaging, indicating a higher risk for early stroke.

Area of Science:

  • Neurology
  • Neuroradiology
  • Cerebrovascular Disease

Background:

  • Transient ischemic attacks (TIAs) are warning signs for stroke, but the underlying pathophysiology leading to early stroke after TIA remains unclear.
  • Understanding the factors that predispose patients to early stroke following a TIA is crucial for timely intervention.

Observation:

  • A study of 12 patients with TIA and less than 75% internal carotid artery stenosis revealed varied findings on single-photon emission computed tomography (SPECT) using technetium-99m HM-PAO.
  • Eight patients showed normal perfusion, while four exhibited a 30-50% reduction in perfusion ipsilateral to the TIA.

Findings:

  • Three of the four patients with reduced perfusion developed an ipsilateral infarct within 3-7 days.
  • None of the eight patients with normal SPECT findings experienced a stroke in the subsequent weeks.

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  • No significant differences in therapy, risk factors, or carotid artery disease severity explained these outcomes.

    • Implications:

    • Persisting focal hypoperfusion after a TIA, even with normal clinical and CT findings, may be a marker for increased early stroke risk.
    • This suggests a subgroup of TIAs associated with ongoing cerebral hypoperfusion requires further investigation and potentially different management strategies.
    • SPECT imaging may help identify TIA patients at higher risk for early stroke.