The effect of nitrous oxide diffusion on laryngeal mask airway cuff inflation in children |
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| Authors: | JOHN ALGREN MD,FAAP,,FERAY GURSOY MD,,T. JOHNSON PhD, & BARBARA SKJONSBY RN,BSN |
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| Affiliation: | Department of Anesthesiology, Baylor College of Medicine and Texas Children's Hospital, Houston, Texas, USA,;Department of Anesthesiology, Inonu University Medical School, Malatya, Turkey |
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| Abstract: | 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. |
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| Keywords: | laryngeal mask airway (LMA) LMA cuff overinflation nitrous oxide diffusion |
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