Objective To investigate the effects of low tidal volume ventilation on pulmonary and cardiac function before and after mitral valve replacement.

目的以心输出量和肺换气功能为指标研究低潮气量通气对瓣膜置换病人心肺功能的影响。

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In patients with normal resting pulmonary ventilation, there was no significant difference of exercise cardiopulmonary function between the central and peripheral lung cancer groups.

在静息肺通气功能正常的情况下，周围型和中心型组间各指标均无显著性差异。

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Before stenting and 1 week, 6 ~ 9 months after stenting, the lumen of stenosis segment, Borg index and pulmonary function were measured to evaluate the improvement of ventilation function.

于支架植入前、植入后1周及6 ~ 9个月期间，分别对患者的气道狭窄段腔径、气促指数及肺功能进行测定，以评价金属支架植入疗法对改善患者肺通气功能的效果。

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