noun
mitral regurgitation; mitral insufficiency
Medical term for a heart valve disorder where the mitral valve does not close properly, allowing blood to leak backward.
僧帽弁閉鎖不全は、心臓の弁が完全に閉じない状態です。
Mitral regurgitation is a condition in which the heart valve does not close completely.
Compound of 僧帽弁 (mitral valve) + 閉鎖不全 (insufficiency, incomplete closure). The term is a direct medical compound.