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

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.

journal_name

Anesth Analg

journal_title

Anesthesia and analgesia

authors

Hohlrieder M,Keller C,Brimacombe J,Eschertzhuber S,Luckner G,Abraham I,von Goedecke A

doi

10.1213/01.ANE.0000180768.81020.C4

subject

Has Abstract

pub_date

2006-01-01 00:00:00

pages

319-21

issue

1

eissn

0003-2999

issn

1526-7598

pii

102/1/319

journal_volume

102

pub_type

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