1. Cardiac-resynchronization therapy reduced mortality at 7 years follow-up in patients with reduced ejection fraction, mild heart failure, and left bundle-branch block.
2. Cardiac-resynchronization therapy did not improve outcomes in patients without left bundle branch block.
Evidence Rating Level: 1 (Excellent)
Study Rundown: Cardiac-resynchronization therapy (CRT) has been established as an...
1. Heart failure patients with left bundle branch block (LBBB) and QRS durations of 150 ms or greater had better outcomes after cardiac resynchronization defibrillator placement. Patients with both LBBB and QRS > 150ms had 3-year mortality of 20.9%, while patients with neither had 3-year mortality of 32.3%.