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Cardiac resynchronization therapy (CRT) is effective in reducing clinical events in patients with heart failure and prolonged QRS interval. Studies using surrogate measures and subgroup analysis of large trials suggest that only patients with severely prolonged QRS benefit from CRT. Our objective was to determine whether the effect of CRT on adverse clinical events (eg, death, hospitalizations) is different in patients with moderately (ie, 120 to 149 milliseconds) [corrected] vs severely (ie, ≥150 milliseconds) prolonged QRS duration.

Impact of QRS Duration on Clinical Event Reduction With Cardiac Resynchronization Therapy