postextrasystolic pause

[ pōst′ĕk-strə-sĭ-stŏlĭk ]

n.

The somewhat prolonged cycle in the heartbeat immediately following an extrasystole.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.