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This study evaluated conduction system pacing (CSP) in 74 patients with left bundle branch block (LBBB) and left ventricular ejection fraction (LVEF) ≤35%, comparing outcomes between those with LVEF <25% (n=32) and LVEF 25-35% (n=42). CSP improved LVEF, LV dimensions, NYHA class, and QRS duration in both groups. However, patients with LVEF <25% had lower final LVEF and higher heart failure rehospitalization rates.

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This study evaluated conduction system pacing (CSP) in 74 patients with left bundle branch block (LBBB) and left ventricular ejection fraction (LVEF) ≤35%, comparing outcomes between those with LVEF <25% (n=32) and LVEF 25-35% (n=42). CSP improved LVEF, LV dimensions, NYHA class, and QRS duration in both groups. However, patients with LVEF <25% had lower final LVEF and higher heart failure rehospitalization rates.
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