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Time to desaturation during intubation. The control (without nasal cannula or blue line) and intervention group (w/ nasal cannula or red line) both underwent preoxygenation to peripheral oxygen saturation (SpO2) ranges of 92–100% and was timed in minutes when SpO2 level fell below various thresholds (range = 92–95%). Teller et al., 1988, Taha et al., 2006, and Baraka et al., 2007 had a maximum apneic cut-off limit of 10, 6, and 4 minutes.
