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

  • Hewitt, Frederic W. (Frederic William), Sir, 1857-1916.
Date:
1901
Catalogue details

Licence: Public Domain Mark

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

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    he had successfully anaesthetised a dog with a mixture of 80 per cent, of nitrous oxide and 20 per cent, of oxygen, under an additional barometric pressure of 20 cm. There was no excitement, and no material disturbance of the normal functions of respiration and circulation. The anaesthesia was everything that could be desired. On the 13th of July following he announced^ that, by his method, he had kept a dog anaesthetised, and free from asphyxial symp- toms, for half an hour ; that a manometer, placed in an artery, had not shown any per- ceptible variations in tension ; that the blood pressure had been raised by irritating exposed nerves ; that irritation of the peripheral end of the vagus had stopped the heart; and that irritation of its central end had stopped the respiration. On Nov. nth of the same year Bert made^ a preliminary report of his results to the Academie des Sciences. On Feb. 15th, 1879, he announced^ to the Society de Biologie that two days previously his method of producing anaesthesia had been for the first time tried upon the human subject. A large air-tight metal chamber in which, by means of pumps, the barometric pressure could be raised, had been employed, and a mixture