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Related Experiment Videos

Circadian variation in ischemic stroke subtypes.

S Chaturvedi1, H P Adams, R F Woolson

  • 1Department of Neurology, Wayne State University, Detroit, Mich 48201, USA. Schaturv@med.wayne.edu

Stroke
|September 2, 1999
PubMed
Summary
This summary is machine-generated.

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While ischemic stroke often occurs in the morning, this study found no strong link between stroke subtype and symptom onset time. Further research is needed to understand circadian variations in stroke.

Area of Science:

  • Neurology
  • Circadian Biology
  • Stroke Medicine

Background:

  • Previous research indicates a peak in ischemic stroke occurrence during mid- to late-morning hours.
  • Limited data exists on circadian variations across different stroke subtypes.

Purpose of the Study:

  • To investigate circadian patterns of symptom onset among various stroke subtypes.
  • To analyze symptom onset timing in acute stroke patients within the Trial of Org 10172 in Acute Stroke Treatment (TOAST) study.

Main Methods:

  • Analysis of 1272 patients from the TOAST study.
  • Documented time of stroke symptom onset for all participants.
  • Standardized stroke subtype classification by a single rater.

Main Results:

Related Experiment Videos

  • Atherothrombotic, cardioembolic, and other/unknown mechanism strokes predominantly occurred between 6:01 AM and 12:00 noon.
  • Lacunar strokes were most frequently present on awakening.
  • Over half of all infarcts occurred upon waking or in the mid- to late-morning.

Conclusions:

  • A trend suggests ischemic stroke clustering in morning hours.
  • No statistically significant correlation was found between stroke subtype and symptom onset time (P=0.07).
  • Circadian patterns lack sufficient specificity to reliably predict stroke subtype.