Dual chamber pacemaker system with V-A time measurement apparatu

Details Dual chamber pacemaker system with V-A time measurement apparatu Dual chamber pacemaker system with V-A time measurement apparatu

1984-01-10

1985-05-07

Kamm, William E.

Surgery

Truss

Pad

A61N 136

Patent

active

045151610

ABSTRACT:
A dual chamber pacemaker having means for operating in different pacing modes, including dual chamber modes, contains the capability of switching into a fixed rate ventricular pacing mode and of sensing early atrial signals without affecting the ventricular pacing timing. The timing of a plurality of such sensed early atrial signals is analyzed to determine if they represent retrograde P waves and, if so, the indicated V-A conduction time. The pacemaker atrial refractory time is adjusted so that, during dual chamber operation, the atrial refractory time extends past the time of anticipated retrograde P waves, thereby optimizing the setting of the atrial refractory period for avoidance of pacemaker mediated tachycardia. Other pacing conditions may also be adjusted in response to the determined patient V-A time.

REFERENCES:
patent: 4021736 (1977-05-01), Walters et al.
patent: 4239985 (1980-11-01), Hartlaub et al.
patent: 4312355 (1982-01-01), Fonke
patent: 4452248 (1984-06-01), Keller, Jr.

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