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Preoxygenation before laryngoscopy in children: how long is enough?
The ideal preoxygenation period prior to laryngoscopy in children is unclear. This study was performed to determine an appropriate duration of preoxygenation for infants and children prior to laryngoscopy using endtidal oxygen (FE'O2) criteria. Healthy paediatric patients for elective day surgery procedures were studied. An inflatable mask connected to an oxygen-primed paediatric anaesthesia semiclosed circuit was placed on the face while patients breathed spontaneously during 6.min-1 oxygen flow. An FE'O2 of 0.9 was considered the endpoint, and if not achieved in two min the protocol was ended. Fifty-eight children were studied. Six patients never achieved an FE'O2 of 0.9 and were not considered in the analysis. The times (in seconds with mean +/- SD and range) to achieve a minimum endtidal (FE'O2) of 0.9 for under six months were 36 +/- 11.4(20-50), 7-12 months were 35.5 +/- 13.3(20-60), 13-36 months were 42.6 +/- 18.7(20-90), 37-60 months were 50.8 +/- 18.5(30-90), > 60 months were 68.4 +/- 24.1(30-100). Logistic regression curves were determined for each age group describing the probability of achieving an FE'O2 of 0.9 against time of preoxygenation. All children with satisfactory mask fit were able to preoxygenate to an FE'O2 of 0.9 within 100 s.
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