Today total cavopulmonary connection (TCPC) is the treatment of choice for long term palliation of patients with hypoplastic left heart syndrome (HLHS). We report a new, relatively simple and effective method to occlude a modified baffle (TCPC) fenestration via the left hepatic vein in two patients with HLHS with the use of electrolytically detachable platinum microcoils after a failed tourniquet closure.