 A retrograde cardioplegic cannula was placed with a pursestring suture of 4-0 Prolene suture in the right atrial wall into the coronary sinus and tied to a Rumel tourniquet. 
A retrograde cardioplegic cannula was placed with a pursestring suture of 4 - 0 Prolene suture in the right atrial wall into the coronary sinus and tied to a Rumel tourniquet .