Mode adaptive pacer

Details Mode adaptive pacer Mode adaptive pacer

A - Human Necessities

61

N

326/1.2

A61N 1/36 (2006.01) A61N 1/362 (2006.01)

Patent

CA 1183575

ABSTRACT A multiple-mode pacer which automatically switches from an atrial synchronous mode to a ventricular inhibited mode when the intrinsic atrial rate drops below a preset hysteresis rate. This mode switching prevents atrial brady- cardia from resulting in the delivery of closely spaced ventricular stimulating pulses. The pacer includes circuitry for generating stimulating pulses to be applied to the heart and circuitry for producing a sensed signal upon detection of cardiac depolarizations. Control circuitry responds to the sensed signal for initiating operation of the cardiac stimulating circuitry at periodic intervals. A counter measures the rate of depolarizations in conjunction with the control means. Automatic switching circuitry alters the control circuitry in response to the counter.

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