vulnerable phase

Medical Dictionary

vulnerable phase vul·ner·a·ble phase (vŭl'nər-ə-bəl)
n.
A phase in the cardiac cycle during which an ectopic impulse may lead to repetitive activity, such as flutter or fibrillation, of the affected chamber.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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