Oxygen (O2) desaturation is one of the risks of intubation, especially in critically ill children with comorbidities, increased O2 consumption and decreased O2 delivery. Desaturation places patients at greater risk for dysrhythmia, hemodynamic instability, hypoxic brain injury, and death. As shown in the oxyhemoglobin dissociation curve, once oxyhemoglobin (PaO2) saturations drop to ~ 90%, there is an increased risk for precipitous desaturation.