Middle ear pressure changes during anaesthesia with or without nitrous oxide are similar among airway devices

Hohlrieder, Mathias, Keller, Christian, Brimacombe, Joseph, Eschertzhuber, Stephan, Luckner, Günter, Abraham, Irene, and von Goedecke, Achim (2006) Middle ear pressure changes during anaesthesia with or without nitrous oxide are similar among airway devices. Anesthesia and Analgesia, 102 (1). pp. 319-321.

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Abstract

We tested the hypothesis that middle ear pressure (MEP) is influenced by the choice of airway device during anesthesia with or without nitrous oxide (N2O) in the gas mixture. Eighty consecutive anesthetized, paralyzed ventilated patients (ASA physical status I–II, 18–65 yr) were randomly allocated for airway management with the orally inserted tracheal tube, classic laryngeal mask airway, ProSeal laryngeal mask airway, or laryngeal tube suction with or without N2O 66% in the gas mixture. MEP was measured from both ears in random order by a blinded observer before induction of anesthesia and every 10 min for 70 min. In the N2O groups, N2O was changed to air after 40 min. There were no differences in MEP among the airway devices in the N2O or air groups. MEP was unchanged in the air groups but increased in the N2O groups with N2O (P < 0.0001) and decreased with air (P < 0.02). Baseline values for MEP were similar, but MEP was always higher for the N2O groups (P < 0.001). We conclude that the choice of airway device does not influence MEP among orally inserted tracheal tube, classic laryngeal mask airway, ProSeal laryngeal mask airway, and laryngeal tube suction during anesthesia with or without N2O in the gas mixture.

Item ID: 4046
Item Type: Article (Research - C1)
ISSN: 1526-7598
Keywords: middle ear pressure; airway; tracheal tube; nitrous oxide
Date Deposited: 12 Nov 2009 01:50
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1103 Clinical Sciences > 110315 Otorhinolaryngology @ 50%
11 MEDICAL AND HEALTH SCIENCES > 1103 Clinical Sciences > 110301 Anaesthesiology @ 50%
SEO Codes: 92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920118 Surgical Methods and Procedures @ 51%
92 HEALTH > 9299 Other Health > 929999 Health not elsewhere classified @ 49%
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