Importance

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Abstract

A method and apparatus for suppressing the ventricular component from an atrial sensing lead used with a dual chamber cardiac pacer, thus obviating the need for an atrial sense refractory period to prevent oversensing of the ventricular interference. The invention utilizes an adaptive filter embodying the Widrow-Hoff least mean square (LMS) algorithm which is connected to receive signals from an endocardial lead having a bipolar ventricular electrode and a unipolar atrial electrode. The bipolar electrodes disposed in the ventricle are connected as the 'input' X.sub.k signal to the LMS adaptive filter while the unipolar atrial electrode output is connected as the 'desired' or reference signal d.sub.k. In accordance with the LMS algorithm, the 'error' signal is fed back and used to adjust the tap weights of the adaptive linear filter until the output thereof closely approximates the 'desired' signal and then the 'error' signal becomes a good approximation of the atrial signal alone, without the ventricular depolarization signal.

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First Claim