Nitrous oxid in anesthesia has become most popular during the last few years. Gas and ether machines have undergone marked improvements. Their use in surgery and dentistry is well-nigh universal. Analgesia has supplanted anesthesia in a considerable field of surgical work. Analgesia is obtained during the first stage of anesthesia. It is the stage of Dammerschlaf, the threshold of sleep, in which stimuli to the skin cause no mental impression, and consciousness is disordered.
Since July, 1913, I have used gas for long-continued analgesia in my obstetric work. The method should not be confounded with the old and well-known use of gas during the past generation, given to deeper stages of anesthesia about the time of actual birth. The results obtained by this new method have been astonishing. There is freedom from pain. There are no bad effects for mother or child. The gas in analgesic doses appears to stimulate
LYNCH FW. NITROUS OXID GAS ANALGESIA IN OBSTETRICS. JAMA. 1915;LXIV(10):813. doi:10.1001/jama.1915.02570360029012
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