Williams A B, Jones P L, Mapleson W W
Department of Anaesthetics, University of Wales College of Medicine, Cardiff.
Anaesthesia. 1988 Feb;43(2):131-5. doi: 10.1111/j.1365-2044.1988.tb05483.x.
Seventy-one patients scheduled to undergo upper or lower abdominal surgical procedures were allocated at random to one of seven treatment groups: in the recovery room they were to receive oxygen via a 40% Ventimask with 10 litres/minute oxygen flow, or via either a Hudson mask or a nasal cannula with 3, 6 or 9 litres/minute oxygen flow. The 40% Ventimask gave the most consistent, satisfactory postoperative values of PaO2 but the much cheaper nasal cannula at 6 or 9 litres/minute was generally adequate in conscious patients. The performance of the intermediately priced Hudson mask was similar to that of the nasal cannula at these flows. The unconscious state was associated with a 45% lower PaO2 than the rousable or awake states. Differences between the treatments with regard to postoperative PaCO2 were small and non-significant. The nasal cannula with 6 litres/minute humidified oxygen flow is recommended for routine treatment, and the Ventimask for unconscious patients.
71名计划接受上腹部或下腹部外科手术的患者被随机分配到七个治疗组之一：在恢复室，他们将通过氧流量为10升/分钟的40%文丘里面罩吸氧，或通过哈德森面罩或鼻导管以3、6或9升/分钟的氧流量吸氧。40%文丘里面罩能提供最稳定、令人满意的术后动脉血氧分压（PaO2）值，但价格便宜得多的6或9升/分钟的鼻导管对清醒患者通常就足够了。中等价格的哈德森面罩在这些氧流量下的表现与鼻导管相似。无意识状态下的PaO2比可唤醒或清醒状态下低45%。各治疗组术后二氧化碳分压（PaCO2）的差异较小且无统计学意义。建议常规治疗使用6升/分钟湿化氧流量的鼻导管，无意识患者使用文丘里面罩。
