目前认为术后经胸超声测得的瓣膜有效开口面积指数是唯一可准确描述该现象的指标。

Currently the indexed effective orifice area measured by postoperative transthoracic echocardiography is considered the only appropriate parameter which can accurately describe the mismatch.

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各类瓣膜的有效开口面积差异较大，其不匹配发生率亦不相同。

Valves of various types can have very different indexed effective orifice areas, so the incidence of mismatch also varies.

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