ELECTRONIC SYSTEM TO DISTINGUISH BETWEEN SINUS AND NONSINUS ATRIAL DEPOLARIZATIONS

摘要

An electronic system for maintaining atrio-ventricular synchrony that distinguishes between sinus and nonsinus atrial depolarizations and that stimulates ventricular contraction only when the immediately preceding atrial contraction was a pacemaker stimulated or spontaneous sinus depolarization. Incorporated into the electronic system is a method of determining the sequence of atrial activation to distinguish sinus from nonsinus atrial activations. The atrial activation sequence is determined by comparing the time at which electrical activity is detected at one point in the atrium to the time at which electrical activity is detected at a point in the atrium closer to the ventricle.