869 SUCCESSFUL TREATMENT OF COMBINED ANNULAR RUPTURE DURING TRANSCATHETER AORTIC VALVE IMPLANTATION: A CASE REPORT

Abstract

Abstract Transcatheter aortic valve implantation (TAVI) has revolutionized the treatment of patients with severe, symptomatic aortic stenosis. Despite being less invasive than conventional open-chest surgery, TAVI remains associated with rare but serious complications such as vascular injury, stroke, coronary obstruction, cardiac perforation and annular rupture. We report a case of a combined annular rupture successful treated by emergent surgery. Case presentation: A low-risk (EuroSCORE:1.14%) 73-year-old male presenting with high-gradient, normal-flow severe aortic stenosis (AS) was referred to our centre. He had preserved left ventricular ejection fraction and heavily calcified aortic valve. The Heart Team recommended isolated surgical aortic valve replacement, but the patient refused this option. We decided to perform transfemoral-TAVI with a 26 mm Edwards valve which was deployed after predilatation with a 23 mm balloon. Immediately after valve deployment, the angiography revealed contrast leakage at the level of the Valsalva sinuses. The patient developed hypotension due to cardiac tamponade which was immediately managed with pericardial drainage. A bailout cardiac surgery was required to remove the TAVI prosthesis and the native aortic leaflets. A left ventricular outflow tract (LVOT) rupture was observed in addition to supra- annular and intra-annular injury. Repair of the left ventricle with a pericardial patch and implantation of a surgical bioprosthesis (Dafodil Meril 21 mm) were performed. No complications occurred post-operatively Annular rupture occurs in about 1% of all TAVI procedures and may involve the region of the aortic root and LVOT. According to the anatomical location of the injury, it can be classified into 4 types: intra-annular, sub-annular, supra-annular, and combined rupture. Annular rupture has been mainly observed after the use of balloon-expandable valves and only exceptionally after TAVI with self- expandable prosthesis. Nevertheless, the following anatomic characteristics are associated with an increased incidence of this catastrophic event: small aortic valve annulus (<20 mm), a narrow aortic root, heavy calcifications of aortic valve leaflets, annulus, LVOT and sinuses of Valsalva, bicuspid valve, short distance from a coronary artery to the annulus and LV hypertrophy. The voluminous amount of calcification located in the landing zone in addition to the force applied during the balloon expansion may be the main mechanism of this catastrophic complication. Clinical presentation is dramatic and emergent surgery can be the sole solution. Alternative bailout treatments, such as placing a second transcatheter valve to close the rupture have been occasionally reported. A precise preprocedural analysis of the device landing zone is mandatory. This includes determination of the size, morphology of all anatomical structures and a careful identification of possible factors for annular rupture. Moreover, in these cases, the availability of cardiac surgery onsite is pivotal to save patient's life. As more and younger patient will undergo TAVI in next years, our report highlightsthe need to optimize preprocedural planning and prosthesis selection. Improvements in devices, procedural techniques, and imaging tools may simplify TAVI and reduce possible complications.