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The effect of nitrous oxide diffusion on laryngeal mask airway cuff inflation in children

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We studied the effect of nitrous oxide (N2O) diffusion on size 2 LMA cuff inflation in 52 children, 38±21 months of age. LMA cuffs were inflated with air (Group A) or 65% N2O, oxygen and halothane (Group B). Cuffs were inflated in a stepwise manner, achieving a cuff leak pressure of 17±4 cm H2O for all patients. Cuff volume and intracuff pressure increased in Group A (8.5±1.0 ml to 10.8±1.4 ml and 101±36 mmHg to 152±42 mmHg, respectively) and decreased in Group B (8.9±1.0 ml to 6.6±1.5 ml and 90±30 mmHg to 53±37 mmHg, respectively). Cuff leak pressure did not change significantly in either group. We conclude that cuff inflation with a mixture of N2O/oxygen prevents N2O diffusion into the cuff, avoiding cuff overinflation without compromising LMA function.

Keywords: LMA cuff overinflation; laryngeal mask airway (LMA); nitrous oxide diffusion

Document Type: Research Article


Affiliations: 1: Department of Anesthesiology, Baylor College of Medicine and Texas Children's Hospital, Houston, Texas, USA, 2: Department of Anesthesiology, Inonu University Medical School, Malatya, Turkey

Publication date: January 1, 1998


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