Bailout surgical explantation of a transcatheter valve-in-valve for subacute thrombosis: When there is no time for anticoagulation: Case report and literature review.

Trancatheter heart valve (THV) thrombosis is effectively treated with anticoagulation but alternative therapies are required when a faster gradient reduction is needed. Open heart surgery has been rarely performed due to the high perioperative mortality and only five cases have been described so far. Here we describe a case of emergent surgical explantation for THV thrombosis after a valve-in-valve. A 67years old man underwent transcatheter aortic valve implantation for a failed surgical bioprosthesis Epic 21mm (St. Jude Medical; St. Paul, Minnesota, US). A CoreValve 23mm (Medtronic, Minneapolis, Minnesota, US) was implanted through femoral access under conscious sedation without complications. Mean transvalvular gradient was effectively reduced (33mmHg vs 16mmHg) with no more than mild residual aortic regurgitation. After 8days the patient was discharged on dual antiplatelet therapy but was readmitted to the intensive care unit for pulmonary oedema 13days later. Echocardiography showed a raised transvalvular mean gradient (mean gradient change from discharge=15mmHg) without aortic regurgitation. Heart Team decided for emergent open heart surgery for the hemodynamic instability. On direct inspection THV was well positioned inside the surgical bioprosthesis but two cusps were covered by thrombus which markedly restricted their mobility. The THV and the former surgical valve were explanted and a new larger stented bioprosthesis was implanted. Thrombosis of the THV was confirmed on microscopic examination which showed no signs of inflammation or degeneration. The patient was discharged after 1month and the 3month follow up showed stable transvalvular gradients.