Sher A M, Braude B M, Cleaton-Jones P E, Moyes D G, Mallett J
Anaesthesia. 1984 Mar;39(3):236-9. doi: 10.1111/j.1365-2044.1984.tb07233.x.
Nitrous oxide concentrations (V/V) at the delivery Rotameters block, nasal mask, pharynx and venous blood, were compared. There was a dilution of approximately 50% of the delivered nitrous oxide at the nasal mask which was further reduced in the pharynx. Venous blood concentrations 10 minutes after inhalation of nitrous oxide were low but as would be calculated from pharyngeal concentrations. After 5 minutes of oxygenation venous blood nitrous oxide concentrations were still relatively high. A total of 92% of subjects experienced a satisfactory effect with 30% nitrous oxide or less in the pharynx.
比较了在输送旋转流量计处、鼻罩、咽部和静脉血中的一氧化二氮浓度（体积/体积）。在鼻罩处输送的一氧化二氮大约有50%被稀释，在咽部进一步降低。吸入一氧化二氮10分钟后的静脉血浓度较低，但正如根据咽部浓度计算的那样。在进行5分钟的氧合后，静脉血中的一氧化二氮浓度仍然相对较高。共有92%的受试者在咽部一氧化二氮浓度为30%或更低时体验到了满意的效果。
