ELECTRICAL PROARRHYTHMIA - INDUCTION OF INAPPROPRIATE ATRIAL THERAPIES DUE TO FAR-FIELD R-WAVE OVERSENSING IN A NEW DUAL-CHAMBER DEFIBRILLATOR

R Wave Far-Field Sensing in Dual Chamber Defibrillators. This case rep ort describes delivery of atrial therapies during a sinus tachycardia in a new dual chamber implantable cardioverter defibrillator inappropr iately caused by-far-field oversensing of ventricular beats in the atr ial channel. Upon classification of the PR interval pattern, the rate criterion for an atrial tachycardia was fulfilled, and the device init iated high-frequency burst pacing as the first stage of programmed tie red atrial therapies, Atrial fibrillation subsequently was induced by high-frequency burst pacing, and eventually a programmed 10-J shock wa s delivered for successful termination of atrial fibrillation, The phe nomenon of far-field oversensing of ventricular beats could be repeate dly observed during exercise testing and abolished by decreasing the a trial sensitivity.