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This is a threshold test of a VVI pacemaker. Note the effect of the PVCs, the first of which competes with the pacer stimulus and suggests capture when there may be none. Also note that the second to last 0.6 volt pulse captures the ventricle but the last, with the same pulse width, does not.
EKG World Encyclopedia http://cme.med.mcgill.ca/php/index.php , courtesy of Michael Rosengarten BEng, MD.McGill
Michael Rosengarten BEng, MD.McGill
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|current||22:48, 18 February 2012||3,004 × 1,148 (473 KB)||DarrelC|