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Summary

Description	The reason why the pacer was pacing at 75/min in the DDD mode was because there is a supraventricular tachycardia (note atrial activity, marked with the turquise arrows, moving through the ventricular complexes) at about 150/min and the DDD pacer was producing 2:1 A/V block. In tracing above with the pacemaker set to a VVI mode, the pacemaker no longer senses the atrium and paces at the set rate of 70/min.
Category	Case reports by Michael Rosengarten
Source	EKG World Encyclopedia http://cme.med.mcgill.ca/php/index.php , courtesy of Michael Rosengarten BEng, MD.McGill
Date	2012
Author	Michael Rosengarten BEng, MD.McGill
Permission	Creative Commons Attribution Noncommercial Share-Alike License

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	07:33, 21 February 2012		3,004 × 656 (666 KB)	DarrelC (talk \| contribs)

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Camera manufacturer	HP
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Date and time of data generation	23:31, 2 May 2009
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File change date and time	06:13, 21 February 2012
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Date and time of digitizing	23:31, 2 May 2009
Date metadata was last modified	14:13, 21 February 2012
Unique ID of original document	4856E29C11D40F15A9CCD45DD9942DDA
Copyright status	Copyright status not set