Ratio of physiological dead space to tidal volume 生理无效腔占潮气量比值
The Effects of Sodium Nitroprusside-Controlled Hypotension on the Arterial-to-end-tidal Carbon Dioxide Gradient and Physiological Dead Space/ tidal Volume Ratio 硝普钠控制性降压对呼气末动脉二氧化碳分压差生理无效腔影响