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k factors and postoperative outcomes. These data enable surgeons and policy-makers to reduce cost variation, improve quality through standardization, and ultimately provide greater value to patients. Since isolated congenital mitral regurgitation (ICMR) is rare, the role of artificial rings in annuloplasty for ICMR is still debated. This study is to compare long-term results of annuloplasty with and without ring for ICMR. We performed a retrospective review for all patients up to 18 years old undergoing repair for ICMR from 1993 to 2019