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This study retrospectively evaluated the long-term patient outcomes and durability of the Mosaic aortic porcine bioprosthesis in the Japan Mosaic valve long-term multicenter study.Methods and Results:We reviewed the records of 1,202 patients who underwent aortic valve replacement with the Mosaic bioprosthesis at 10 centers in Japan (1999-2014). Patient data were collected using Research Electronic Data Capture. Patient survival was determined by Kaplan-Meier methodology. Freedom from structural valve deterioration (SVD) and valve-related reoperation and death were determined by actuarial methods. The median (interquartile range [IQR]) age of the cohort was 76 (70-80) years. The median (IQR) follow-up period was 3.52 (1.71-5.35) years. The longest follow-up was 15.8 years. The 30-day mortality rate was 2.3%. The 12-year actuarial survival rate was 59.9±7.5%, and the freedom from valve-related death was 81.1±7.9%. The freedom from reoperation was 86.4±2.6% at 12 years. The freedom from SVD at 12 years was 93.5±2.9% for patients aged ≥65 years and 98.2±1.8% for those aged &lt;65 years. The median (IQR) systolic pressure gradient was 17 (12-23) and 19 (12-25) mmHg at 1 and 10 years, respectively. The median (IQR) effective orifice area was 1.2 (1.1-1.5) and 1.1 (1-1.5) cm 2 at 1 and 10 years, respectively.

Long-Term Outcomes of the Mosaic Aortic Porcine Bioprosthesis in Japan ― Results From the Japan Mosaic Valve Long-Term Multicenter Study ―