System for detecting pacer mediated tachycardia

Details System for detecting pacer mediated tachycardia System for detecting pacer mediated tachycardia

1984-12-05

1986-02-11

Kamm, William E.

Surgery

Truss

Pad

128419PT, A61N 136

Patent

active

045693501

ABSTRACT:
A system is provided for detecting pacer mediated tachycardia. Atrial electrical signals (P waves) are sensed and ventricular electrical signals (R waves) are sensed. When a P wave is sensed, after a predetermined AV delay, a stimulating pulse is provided to the ventricle if no R wave is sensed during the AV delay. A threshold rate is selected for the sensed PP interval. If the ventrical has been stimulated and the threshold rate is exceeded for a selected number of PP intervals, the AV delay is increased by a predetermined time (delta). A determination is made whether the next sensed PP interval has increased by delta. If the next sensed PP interval has increased by delta, then pacer mediated tachycardia has occurred.
In another embodiment, if the threshold rate is exceeded for a selected number of PP intervals, and the ventricle has been stimulated, then the sensed PP interval is measured and the AV delay is increased to a desired minimum PP interval minus the actual measured PP interval. If the rate continues to be greater than the threshold on the next heartbeat, then pacer mediated tachycardia is not present, and the initial AV delay is reestablished.

REFERENCES:
patent: 4412541 (1983-11-01), Schaldach et al.
patent: 4429697 (1984-02-01), Nappliolz et al.
patent: 4432362 (1984-02-01), Leckrone et al.
patent: 4452248 (1984-06-01), Keller, Jr.
patent: 4505276 (1985-03-01), Markowitz et al.

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