Device implantation
A biventricular pacemaker with implantable defibrillator with the MPP feature was implanted in all patients together with a quadripolar LV lead (Quartet®, Abbott, Sylmar, CA). Immediately after implant and before discharge, if at least 2 MPP vectors options were available the MPP algorithm was turned ON. Investigators programmed devices and MPP based on their discretion. However, MPP configuration was recommended following one of the 2 different approaches:
Anatomical approach: choose the most anatomically separated vectors based on the position of each electrode, documented through fluoroscopic images.
Electrical approach: choose the most electrically separated vectors based on the data provided by the Conduction Delay Test (based on RV paced to LV sensed).