Isolation of Left Pulmonary Veins by Ethanol Injection in the Vein of Marshall
The vein of Marshall is localized on the posterior part of the left atrium. It drains the blood from the left atrial endocardium to the coronary sinus. There are epicardial fibers which travel along the vein of Marshall. The endocardial radiofrequency ablation of these fibers, to achieve mitral isthmus isolation, has been challenging, because the fibers are surrounded and isolated by fatty tissue1. Ethanol infusion of the vein of Marshall has been proposed to solve this issue.