Patent ID: 7120490

Claim:
A method comprising: computing a present indicated ventricular pacing interval, using infinite-impulse response (IIR) filtering, the filtering using as inputs: (1) a most recent V—V interval duration between ventricular events; and (2) a previously-computed value of the indicated ventricular pacing interval that corresponds to a V—V interval that immediately precedes the most recent V—V interval, the IIR filtering providing, as an output, the present indicated ventricular pacing interval; pacing a ventricle using the present indicated ventricular pacing interval; detecting an atrial tachyarrhythmia; determining whether potentially proarrhythmic conditions exist in the ventricle; and after the pacing the ventricle, the detecting the atrial tachyarrhythmia, and the determining whether potentially proarrhythmic conditions exist, then delivering cardioversion/defibrillation therapy to the atrium if it is determined that no potentially proarrhythmic conditions exist in the ventricle, otherwise withholding the delivery of cardioversion/defibrillation therapy to the atrium until it is determined that no potentially proarrhythmic conditions exist in the ventricle.