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vulnerable phase

(vŭlnər-ə-bəl)
n.
  1. 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.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.