Cardiac Resynchronization Therapy in the Absence of LV Mechanical Dyssynchrony: Primum Non Nocere.

C urrent guidelines for selection of patients for cardiac resynchronization therapy (CRT) provide a Class I, Level of Evidence: A indication for patients with a wide QRS (>150 ms) and left bundle branch block (LBBB), and a Class III indication for patients with QRS duration <120 ms (1). However, there remain 3 problems. First, the right course is less clear… CONTINUE READING