539 GOING BEYOND CRT NON-RESPONSE: ECHO-GUIDED LEFT BUNDLE-BRANCH PACING

Abstract We present the case of a 56-year-old man affected by heart failure (HF) with reduced ejection fraction (HFrEF) and permanent atrial fibrillation, who previously underwent CRT-D implant left ventricular stimulation delivered an epicardial pacing lead due to unfavourable CS anatomy. upgraded this system bundle branch pacing. The LBB was connected plug in device order deliver multisite programmed DDDR mode delay between two LV sites chosen (modifying atrioventricular delay) after multimodality assessment (both electrocardiographic echocardiographic) obtain best resynchronization systolic performance.