Shankar K B, Moseley H, Vemula V, Kumar Y
Can J Anaesth. 1987 Jul;34(4):373-6. doi: 10.1007/BF03010136.
The physiological dead space and its components were determined during general anaesthesia for Caesarean section in seventeen patients and compared with similar values for seventeen patients undergoing abdominal hysterectomy under general anaesthesia. The physiological dead space was smaller in the pregnant patients, due to a smaller alveolar dead space. The anatomical dead space was similar in both groups. A lowered physiological dead space suggests that there will be a decrease in the pulmonary ventilation perfusion ratio (V/Q) during Caesarean section; this could result from better perfusion of the ventilated alveoli than in the non-pregnant group, due to the increased cardiac output of pregnancy. An improvement in alveolar perfusion should also produce more efficient carbon dioxide elimination in pregnant patients, when compared to non-pregnant subjects.
在17例剖宫产全麻患者中测定了生理死腔及其组成部分，并与17例全麻下行腹部子宫切除术患者的类似值进行了比较。由于肺泡死腔较小，孕妇的生理死腔较小。两组的解剖死腔相似。生理死腔降低表明剖宫产期间肺通气灌注比（V/Q）将降低；这可能是由于妊娠期间心输出量增加，通气肺泡的灌注比非妊娠组更好。与非妊娠受试者相比，肺泡灌注的改善也应使孕妇的二氧化碳消除更有效。
