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Nitrous oxide and middle ear pressure
Author(s) -
CASEY W. F.,
DRAKELEE A. B.
Publication year - 1982
Publication title -
anaesthesia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.839
H-Index - 117
eISSN - 1365-2044
pISSN - 0003-2409
DOI - 10.1111/j.1365-2044.1982.tb01849.x
Subject(s) - medicine , nitrous oxide , middle ear , eustachian tube , anesthesia , ventilation (architecture) , positive pressure , breathing , surgery , mechanical engineering , engineering
Summary The effects of different methods of induction of anaesthesia on middle ear pressure were investigated in healthy children. An increase in middle ear pressure associated with positive pressure ventilation with a bag and mask was demonstrated. When nitrous oxide was used, middle ear pressure increased by 39 mmH 2 O/minute in spontaneously breathing patients and 63 mmH 2 O/minute in those who were ventilated. Maximum pressures, with venting through the Eustachian tube, could be reached within 5 minutes in the latter group.