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Transseptal Implantation of a Left Ventricular Pacing Lead for an Ectopic Location of the Coronary Sinus Ostium in the Left Atrium

Congenital abnormalities of the coronary sinus (CS) are rare but can be responsible for unsuccessful implantation of a cardiac resynchronization therapy device. We report the case of an ectopic drainage of the CS in the left atrium. A left ventricular lead was implanted by the transseptal route. (PACE 2013; 36:e51–e52)