Fig. 1From: Case presentation: implantation of cardiac resynchronization therapy pacemaker via the coronary sinus in a patient with triple valve replacementA quadripolar pacing lead (Quartet LV lead model 1458Q, StJude Medical) was introduced into anterior interventricular vein (AIV), while a bipolar pacing lead (QuickFlex μ model 1258 T, St Jude Medical) into middle cardiac vein (MCV). a. Anteroposterior position. b. Right anterior oblique positionBack to article page