Cardiac Resynchronization Therapy in Patients With Heart Failure and a QRS Complex <120 ms: the LESSER-EARTH Trial

Study Questions:

What is the effect of cardiac resynchronization therapy (CRT) on exercise capacity and left ventricular (LV) reverse remodeling outcomes in patients with an LV ejection fraction (LVEF) ≤35%, symptoms of heart failure, and a QRS duration <120 ms?