Juntendo University Mar 14 2025 Atrial functional mitral regurgitation (AFMR) is a common type of MR linked to high rates of heart failure, highlighting the need to understand its prognostic factors. Tricuspid regurgitation (TR) is a known prognostic factor in heart diseases like heart failure and degenerative MR. It is also frequently observed in AFMR patients, making it crucial to understand its impact on AFMR outcomes. To address this gap, a research team led by Dr. Tomohiro Kaneko and Dr.