Pacemaker Inhibition by Myopotentials Detected by Holter Monitoring

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Abstract
Ambulatory eiectrocardiography revealed myopoiential inhibition of a demand ventricular pacemaker in each of two patients. Although it was first regarded as artifact, fine baseline osciliations observed during apparent pacemaker malfunction actualiy signalled skeletal muscie‐induced pacemaker inhibition. Though not widely recognized, myopotential inhibition may be a common occurrence in unipolar lead systems. As greater numbers of patients undergo ambulatory monitoring, awareness of this phenomenon should become more widespread