In addition to traditional pacemakers, biventricular pacemakers are a treatment option for people with heart failure whose hearts’ electrical systems have been damaged. Unlike a regular pacemaker, a biventricular pacemaker stimulates both of the lower chambers of your heart (the right and left ventricles) to make the heart beat more efficiently. A biventricular pacemaker paces both ventricles so that all or most of the ventricular muscle pumps together. This allows your heart to pump blood more effectively. Because this treatment resets the ventricles’ pumping mechanism, it’s also referred to as cardiac resynchronization therapy (CRT).