The connection between strokes and the internal clock

by Medindia Content Team on  August 18, 2006 at 5:25 AM Mental Health News
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The connection between strokes and the internal clock
Researchers have indicated that Ischemic strokes have a tendency of occurring in the morning as against hemorrhagic strokes, which show a patternof occurrence during the early evening.

This fact was revealed when they studied 12,957 patients who had suffered a cerebral infarction, an intracerebral hemorrhage, or a subarachnoid hemorrhage. The presence of two peaks were prominent, the 6 a.m. to 8 a.m peak, and the 6 p.m. to 8 p.m. peak. There was an obvious plunge during sleep.

When researchers probed further, cerebral infarction showed a bimodal pattern with a higher peak in the morning, a slight fall at noon, a lower peak in the early evening, and a total fall at night. The researchers attributed this difference to the impact of cerebral infarctions in which stroke onset happened during sleep; 20% of the cases showed an occurrence during sleep- during the time of waking up from sleep, with only 10% of hemorrhagic strokes occurring in the midst of sleep.


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