Study population
The study prospectively enrolled consecutive adult patients who underwent LBBAP for bradycardia or heart failure indications at the Ghent University Hospital since November 2019. In bradycardia patients, LBBAP was attempted as first choice pacing strategy or in case of failed HBP attempt. In heart failure patients, LBBAP was attempted in case of failed coronary sinus lead placement. The study was approved by the local ethics committee of Ghent University Hospital and all patients gave written informed consent.