Patent attributes
An atrial defibrillator has a stimulation pulse generator to generate pacing pulses, a sensing stage for sensing intrinsic ventricular events, (an R-wave having an amplitude). It also includes a defibrillation shock generator to generate an atrial defibrillation shock, an atrial fibrillation detector adapted to detect an atrial fibrillation, and a control unit connected to the stimulation pulse generator. The sensing stage, the atrial fibrillation detector, the defibrillation shock generator, and control unit are adapted to trigger an atrial defibrillation shock after detection of an atrial fibrillation and synchronous with a sensed or a paced ventricular event. The control unit is adapted to compare a sensed R-wave amplitude with a reference R-wave amplitude and synchronize an atrial defibrillation shock with a paced ventricular event or a sensed ventricular event if the sensed ventricular event is an R-wave having an amplitude of at least 60% of the magnitude of the reference amplitude.
