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1 Cardiothoracic Service, Division of Surgery and the Cardiology Service, Division of Medicine, Montefiore Hospital and Medical Center, Bronx, N.Y.
Hysteresis rate ventricular inhibited pacing permits a longer period to elapse from a spontaneous cardiac contraction to the first pacemaker impulse, than between succeeding impulses during continuous pacing. It allows a cardiac rate, conducted or idioventricular, slower than the paced rate to inhibit the pacemaker. In the first of two patients, an increase in idioventricular rate paradoxically slowed the total cardiac rate from 71-62 during activity. In the other, false recycling from a P wave permitted an asystolic period of 1.4 seconds.
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