Objective:To observe whether percutaneous transluminal ballonmitral valvuloplasty (PTBMV) can improve the pulmonary function of patients with single mitral stenosis (MS).

• 目的：观察单纯二尖瓣狭窄(MS)患者接受经皮腔内球囊二尖瓣成形术(PTBMV)治疗前后的肺功能指标的变化。