How to maximize QRS narrowing

Cardiac resynchronization therapy (CRT) resulting in maximal QRS narrowing may be associated with improved outcomes. Various atrioventricular (AV) delay settings, including the new SyncAV™ algorithm (St. Jude Medical/Abbott, St. Paul, MN, USA), aimed at maximal QRS narrowing were tested in an 81-year old CRT recipient. Maximal QRS narrowing from 160 to 100 ms was achieved with a manually programmed value of SyncAV™ −30 ms. At 2 months, the patient proved to be a CRT super-responder. SyncAV™ algorithm is a new way for effective QRS narrowing with potentially improved outcomes.