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The extra spikes that you see are from a myoplasty stimulator. This is a stimulator stimulating a muscle wrapped around the heart. It is stimulating the muscle every second beat. A train is used as this is a skelital muscle and not heart muscle.
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||07:47, 21 February 2012||3,292 × 1,887 (5.9 MB)||DarrelC|