Dolan P F, Rosen M
Lancet. 1975 Nov 22;2(7943):1030-1. doi: 10.1016/s0140-6736(75)90305-0.
A mouthpiece offered as an alternative to a facemask increased the acceptance of inhalational analgesia during labour from 76% to 96% of 50 patients. 92% of those patients offered a choice of a mask or mouthpiece would use the same device in another labour compared with only 64% of those offered only a facemask.
作为面罩替代品的咬嘴，使50名产妇中接受分娩期吸入镇痛的比例从76%提高到了96%。在那些可选择面罩或咬嘴的产妇中，92%表示若再次分娩仍会使用同一设备，而在那些仅提供面罩的产妇中这一比例仅为64%。
