Panthee, NirmalArata MurakamiMasahiko AndoTetsuhiro TakaokaMinoru Ono2026-10-082026-10-082014https://doi.org/10.31729/jnma.2762https://hdl.handle.net/20.500.14572/8042Abstract The immediate postoperative period of Fontan operation is frequently complicated by hemodynamic instability, sometimes requiring fenestration of the conduit. Thrombosis of total cavo-pulmonary connection conduit warrants early intervention to prevent systemic and pulmonary embolism. We report a case of Fontan failure requiring fenestration; which was further complicated by thrombosis of total cavo-pulmonary connection conduit and managed with anticoagulants. Keywords: Congenital heart disease; Fontan procedure; Thrombosis.en-USCongenital heart diseaseFontan procedureThrombosisArticle