A fortuitous syncope. The pitfalls of integrated bipolar defibrillator leads.
Myopotential oversensing in implantable defibrillators causing inhibition of pacing and inappropriate therapies is well described. Current literature is dominated by reports of diaphragmatic muscle as the source of such far-field oversensing. Those reporting pectoral muscle sources were invariably due to unipolar sensing circuits, incorrect DF-1 connections or inappropriate programming. We report an interesting case of pectoral muscle myopotential oversensing causing inhibition of bradycardia pacing leading to presyncope and syncope.
Salukhe
Tushar V
TV
Department of Cardiac Electrophysiology, St Mary's Hospital and Imperial College, London, UK. salukhe@aol.com
Wright
Ian
I
Wright
Matthew
M
Kanagaratnam
Prapa
P
O'Neill
Mark D
MD