Dual-chamber pacemaker with automatic selection of atrial refrac

Details Dual-chamber pacemaker with automatic selection of atrial refrac Dual-chamber pacemaker with automatic selection of atrial refrac

1990-08-14

1992-06-23

Kamm, William E.

Surgery

Truss

Pad

A61N 1368

Patent

active

051234122

ABSTRACT:
An improved atrial synchronous dual-chamber pacemaker provided with a variable refractory period during which the pacemaker is not responsive to sensed atrial contractions. The atrial refractory period is selected based upon whether the ventricular pacing pulse preceding the refractory occurred as a result of time out of the interval corresponding to the basic ventricular pacing rate, or due to time out of the A-V delay interval initiated in response to sensing of a natural atrial contraction. The pacemaker may most easily be practiced by modifying a DDD type pacemaker, and employing the V-A interval, normally separating an atrial pacing pulse from an immediately preceding ventricular contraction, as an extended atrial refractory period, employed only after generation of a ventricular pacing pulse not triggered by a preceding atrial contraction.

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Rate Responsive Dual Chamber Pacing.

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