Triple atrial sensing during cardiac resynchronization

LEFT VENTRICULAR SENSING Some implantable devices for cardiac resynchronization therapy (CRT) with cardioverter‐defibrillator capability, as the one in this report, can sense LV activity. [...]far‐field atrial sensing by an LV lead strongly suggests lead displacement toward the AV groove. The left ventricular lead (LV) is displaced toward the coronary sinus but its location is not clearly discernible SHOCK DELIVERY Inappropriate shocks in Twiddler syndrome often originate during sinus rhythm when a displaced right ventricular lead detects both the atrial electrogram and the far‐field ventricular electrogram.