mitral valve

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Just two years later (1898) doctors were proposing to operate on the mitral valve in order to restore cardiac function.
仅仅两年后，医生们开始通过对二尖瓣做手术来使恢复病人心跳。
People with panic disorder are more likely to have mitral valve prolapse, hypertension, peptic ulcer, diabetes, angina or thyroid disease.
有惊恐障碍的人更容易有二尖瓣脱垂，高血压，消化系统溃疡，糖尿病，心绞痛或甲状腺疾病。
Objective: To explore nursing for the patients with mitral valve replacement by chordal preservation.
前言：目的：探讨保留瓣下结构二尖瓣置换术的护理配合。

The Abbott valve repair device, which essentially clips the mitral valve shut, was tested in a study that company-funded researchers said showed it was roughly equivalent to surgery.
FORBES: New Heart Valves Prove We're Living In The Future
The panel met to evaluate use of the novel device in patients with significant symptomatic mitral regurgitation (MR) who have been determined by a cardiac surgeon to be too high risk for open mitral valve surgery and in whom existing co-morbidities would not preclude the expected benefit from correction of the MR.
FORBES: FDA Panel Gives Tepid Endorsement To Abbott's MitraClip
Last April doctors told 70-year-old Roseanne Brennan that her mitral heart valve needed to be replaced.
FORBES: Magazine Article

the valve (= a structure that opens and closes) in the heart that stops blood from returning into the left atrium (= upper space) from the left ventricle (= lower space)

the valve between the left atrium and the left ventricle of the heart, consisting of two membranous flaps, that prevents regurgitation of blood into the atrium (Also called bicuspid valve)