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triggered activity

(trĭgərd)
n.
  1. One or a series of spontaneously generated heartbeats originating from an action potential that produces an after-depolarization that reaches activation threshold.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.