Wolpert C, Jung W, Scholl C, Spehl S, Cyran J, Lüderitz B
Department of Medicine-Cardiology, University of Bonn, Germany.
J Cardiovasc Electrophysiol. 1998 Aug;9(8):859-63. doi: 10.1111/j.1540-8167.1998.tb00126.x.
This case report describes delivery of atrial therapies during a sinus tachycardia in a new dual chamber implantable cardioverter defibrillator inappropriately caused by far-field oversensing of ventricular beats in the atrial channel. Upon classification of the PR interval pattern, the rate criterion for an atrial tachycardia was fulfilled, and the device initiated high-frequency burst pacing as the first stage of programmed tiered atrial therapies. Atrial fibrillation subsequently was induced by high-frequency burst pacing, and eventually a programmed 10-J shock was delivered for successful termination of atrial fibrillation. The phenomenon of far-field oversensing of ventricular beats could be repeatedly observed during exercise testing and abolished by decreasing the atrial sensitivity.
