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How transient are transient ischemic attacks?

D E Levy1

  • 1Department of Neurology, Cornell University Medical College, New York, NY 10021.

Neurology
|May 1, 1988
PubMed
Summary
This summary is machine-generated.

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Transient ischemic attacks (TIAs) and reversible ischemic neurologic deficits (RINDs) often resolve quickly. However, deficits lasting over 60 minutes rarely resolve spontaneously, suggesting potential therapeutic effects from interventions.

Area of Science:

  • Neurology
  • Clinical Medicine
  • Epidemiology

Background:

  • Transient ischemic attacks (TIAs) and reversible ischemic neurologic deficits (RINDs) are critical indicators of potential stroke.
  • Understanding the duration of ischemic neurological deficits is crucial for diagnosis and prognosis.

Purpose of the Study:

  • To determine the duration of ischemic neurological deficits in hospitalized patients diagnosed with TIA, RIND, or ischemic stroke.
  • To evaluate the spontaneous resolution rates of ischemic deficits over time.

Main Methods:

  • Retrospective analysis of 1,343 hospitalized patients from the Cornell Neurology Database.
  • Categorization of patients based on final diagnoses: TIA, RIND, or ischemic stroke.
  • Examination of the time course of neurological deficit resolution.

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Main Results:

  • 28.4% of patients experienced episodes resolving within 24 hours (TIA definition).
  • 50.0% of TIA episodes resolved in under 30 minutes.
  • Only 13.8% of deficits lasting ≥60 minutes resolved within 24 hours.
  • Spontaneous resolution rates after 60 minutes were consistently below 2% per hour.

Conclusions:

  • The classic definition of TIA (resolution within 24 hours) encompasses a wide range of deficit durations.
  • For patients with deficits persisting beyond 60 minutes, spontaneous resolution is unlikely.
  • Observed rapid resolutions after new treatments may indicate therapeutic efficacy, even in non-randomized settings.