Biventricular pacing is an excellent option for certain patients with advanced HF. Also known as “cardiac resynchronization therapy,” biventricular pacing has been shown to improve HF symptoms ...

AV interval optimization using the Ritter method. (A) Intrinsic rhythm with EA fusion. (B) Biventricular pacing with short AV interval (50 ms). QA = 120 ms (dotted line). Note the truncated A wave.

First, all patients were tested for double counting intraoperatively during sinus rhythm in the ODO pacing mode ... the time of implantation to assure biventricular capture and prevent double ...