
A study aimed to evaluate whether atrioventricular (AV) optimized His bundle pacing is preferable to no-pacing in patients with heart failure, left ventricular ejection fraction (LVEF) ≤40%, PR interval ≥200 ms, and either QRS ≤140 ms or right bundle branch block. The study found that His bundle pacing did not increase peak oxygen uptake or LVEF, but it significantly improved quality of life and was symptomatically preferred by the clear majority of patients. The findings suggest that His bundle pacing can be an effective treatment option for patients with heart failure and prolonged PR intervals.
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