The administration of nitrous oxide and oxygen for dental operations / by Frederic W. Hewitt.

  • Hewitt, Frederic W., (Frederick William), Sir, 1857-1916.
Date:
[1897]
Catalogue details

Licence: Public Domain Mark

Credit: The administration of nitrous oxide and oxygen for dental operations / by Frederic W. Hewitt. Source: Wellcome Collection.

Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.

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    ing that he found that if the pressure were only 100 cm., or 105 cm., the patient reco- vered more quickly than with a pressure of 115 or 120 cm. After-nausea was more fre- quent in the prolonged administrations than in the others. I have elsewhere12 described an interest- ing experiment which M. Martin made upon a dog. He kept the animal breathing a mixture of 85 per cent, of nitrous oxide and 15 per cent, of oxygen under a pressure of from 110 to 120 cm., for three consecutive days, without any untoward effects during or after the insensibility. Nothing could more forcibly demonstrate the harmlessness of the mixture than such an ex- periment. On April 30th, 1883, Bert read his final paper on the subject.13 Having reviewed his previous work, he stated that he had been endeavouring to produce prolonged nitrous oxide anaesthesia without the employment of increased atmospheric pressure, and that he had been successful in the case of the lower animals. He regarded the alternate adminis- tration of nitrous oxide and air as objectionable. He first tried administering nitrous oxide and oxygen alternately ; but the rapid elimination of the former gas in the presence of the latter led to a too sudden recovery. He next adminis- tered, alternately, pure nitrous oxide and a