Proposed cardiac pacemaker system combining unipolar stimulation with bipolar sensing.
Explore the source record for details and available documents.
Electric Stimulation↗
Biomedical subjects
V De Caprio
Publications and source records attributed to V De Caprio.
Cardiac pacing and pacemaker. III. Sensing the cardiac electrogram.
Explore the source record for details and available documents.
Cardiac Catheterization↗
Electrode causation of pacemaker inhibition.
Electromechanical nonphysiologic signals caused by the movement of intracardiac metal portions of an endocardial grasping electrode were shown to be "falsely" recycling an implanted pacemaker. The signals were similar in amplitude and slew rate to the ventricular electrogram and were terminated by ending the movement of the two metallic surfaces.
Arrhythmias, Cardiac↗
Endocardial electrograms and pacemaker sensing.
Endocardial electrograms in 77 acute cases (at time of pacemaker implant) and 56 chronic cases (at time of pulse generator replacement, with electrodes in service for at least 6 months) were recorded. The peak-to-peak voltage and rate of rise, or slew rate, were compared acutely and chronically. Both parameters must simultaneously exceed given thresholds to trigger the sensing circuits of implantable pacemakers. The average chronic slew rate was half the average acute value. The maximum slew rate and voltage swing occur during the intrinsic deflection as a virtually straight line segment of the electrogram. The findings are consistent with the predictions of a mathematical model for genesis of the electrogram, and also with a model for explaining acute-to-chronic changes in stimulation current thresholds.
Electrocardiography↗