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Biventricular implantation procedures require contrast venography of the coronary sinus. The aim of our study was to evaluate the efficacy and safety of contrast venography obtained by direct manual contrast injection into the guiding catheter, compared with venography obtained after occlusion of the coronary sinus by a Swan-Ganz catheter.

A randomized evaluation of different approaches to coronary sinus venography during biventricular pacemaker implants