Demand Pacemaker Malfunction Due to Abnormal Sensing

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Abstract
Two cases with external demand pacemakers are presented because of abnormal prolongation in the pacing interval. In both cases, pacemaker inhibition was caused by signals which were not recorded by the conventional surface electrocardiograms. In one case, inhibition was related to a partial lead fracture which generated a voltage transient in the region of the T wave. In the other case, inhibition was caused by current emitted from a faulty pacemaker unit. In both cases precise localization of the problem was possible by simple bedside recordings and measurements.

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