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ABSTRACT Introduction: This study was aimed to evaluate the sex-based differences in baseline characteristics and one-year outcomes of men and women undergoing mitral valve repair for infective endocarditis. Methods: This cross-sectional study was performed at Imam Ali Hospital affiliated with the Kermanshah University of Medical Science. From March 21, 2014, to October 21, 2021, all patients who underwent mitral valve repair for infective endocarditis were enrolled in this study. Data were obtained using a checklist developed based on the study’s objectives. Independent samples t-tests, paired samples t-tests, and chi-squared test (or Fisher’s exact test) were used to assess the differences between subgroups. Results: Of 75 patients, 26 were women (34.7%) and 49 were men (65.3%). Women were more likely to have diabetes mellitus (20.4% vs. 57.7%, P=0.0001), hypertension (49% vs. 80.8%, P=0.007), and hypercholesterolemia (55.1% vs. 80.8%, P=0.027). Conversely, men were more likely to have a history of smoking (38.8% vs. 7.7%, P=0.004). After one year, women had significantly higher mortality (0% vs. 7.7%, P=0.049), major adverse cardiac and cerebrovascular events (51.0 vs. 76.9, P=0.029), mitral valve reoperation (8.1% vs. 34.6%, P=0.003), and treatment failure (30.6% vs. 61.5%, P=0.009) rates than men. Conclusion: Mortality, major adverse cardiac and cerebrovascular events, mitral valve reoperation, and treatment failure rates were higher in women than in men. The worse outcomes in women may be explained by their more adverse clinical risk profile. Introduction sexbased sex oneyear year Methods crosssectional cross sectional Science 21 2014 2021 studys s objectives ttests, ttests t tests, tests t-tests chisquared chi squared or Fishers Fisher subgroups Results 7 2 34.7% 347 34 (34.7% 4 65.3%. 653 65.3% . 65 3 (65.3%) 20.4% 204 20 (20.4 vs 577 57 57.7% P=0.0001, P00001 P P=0.0001 , 0 0001 P=0.0001) 49% (49 808 80 8 80.8% P=0.007, P0007 P=0.007 007 P=0.007) 55.1% 551 55 1 (55.1 P=0.027. P0027 P=0.027 027 P=0.027) Conversely 38.8% 388 38 (38.8 77 7.7% P=0.004. P0004 P=0.004 004 P=0.004) 0% (0 P=0.049, P0049 P=0.049 049 P=0.049) 51.0 510 51 (51. 769 76 9 76.9 P=0.029, P0029 P=0.029 029 P=0.029) 8.1% 81 (8.1 346 6 34.6% P=0.003, P0003 P=0.003 003 P=0.003) 30.6% 306 30 (30.6 615 61 5 61.5% P=0.009 P0009 009 Conclusion Mortality profile 201 202 34.7 (34.7 65.3 (65.3% 20.4 (20. 57.7 P0000 P=0.000 000 (4 80.8 P000 P=0.00 00 55.1 (55. P002 P=0.02 02 38.8 (38. 7.7 ( P004 P=0.04 04 51. (51 76. 8.1 (8. 34.6 30.6 (30. 61.5 34. (34. 65. (65.3 20. (20 57. 80. P00 P=0.0 55. (55 38. (38 7. (5 8. (8 30. (30 61. (34 (65. (2 P0 P=0. (3 (65 P=0 (6 P=