Difficult Coronary Sinus Cannulation during Cardiac Resynchronization Therapy due to its Diverticulum

Abstract: Coronary sinus (CS) diverticulum is one the different types of malformations of the right atrium and CS. It can be the primary focus of supraventricular arrhythmias and complicate CS lead implantation during cardiac resynchronization therapy (CRT) device implantation. Herein, we report on a case of CS diverticulum that caused difficulty in CS lead insertion during CRT implantation.