Arrhythmias: Changing indications for biventricular pacing in bradycardia.

The BLOCK HF trial demonstrated that, during continual cardiac pacing, adverse left ventricular remodelling and deterioration of systolic function occurred more frequently with right ventricular than with biventricular pacing. These findings will increase the role of biventricular pacing for the preservation of left ventricular function in patients with atrioventricular block.