Constant A-A interval control for DVI and DDD cardiac pacemakers

Details Constant A-A interval control for DVI and DDD cardiac pacemakers Constant A-A interval control for DVI and DDD cardiac pacemakers

1983-06-15

1985-06-18

Kamm, William E.

Surgery

Truss

Pad

A61N 136

Patent

active

045235937

ABSTRACT:
A physiologic cardiac pacer operable in the DVI or A-V sequential pacing mode or the DDD or fully automatic pacing mode senses for the omission of an R-wave from an implantable cardiac pacer during the A-V interval. If the pacer does not sense a R-wave during the A-V interval the V-A interval is timed out immediately following the A-V interval and an atrial pacing pulse is issued at the end of the V-A interval. In the event, however, that an R-wave is sensed during the A-V interval, a flag is set and then the entire A-V interval is to be timed out, at which time the state of the flag is determined. If an R-wave was previously issued, a ventricular pacing pulse is not issued to the pacer at the end of the A-V interval, whereas if the flag is not set it is transmitted to the pacer.

REFERENCES:
patent: 4378020 (1983-03-01), Nappholz et al.
patent: 4412541 (1983-11-01), Schalbach et al.
patent: 4421116 (1983-12-01), Markowitz

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