Patent ID: 6029086
Filing Date: 2000-02-22
Classification: A61N

Abstract:
An implantable cardiac rhythm management device capable of automatically sensing intrinsic events of a patient's heart and having an adjustable sensing threshold, said device including:(a) a pulse generator;(b) a controller for controlling activation of the pulse generator;(c) conduction means for conducting an electrocardiogram signal which includes electrical impulses corresponding to cardiac depolarization and noise;(d) detecting means coupled to the conduction means for detecting intrinsic events from the signal;(e) measuring means for at least estimating an amplitude of the noise during a period following detected intrinsic events and memory means for storing the estimated amplitude of noise over a plurality of detected intrinsic events; and(f) adjusting means for adjusting the sensing threshold dependant upon the amplitude of noise estimated from the detected plurality of intrinsic events.