Figure 4From: The use of the Airtraq® optical laryngoscope for routine tracheal intubation in high-risk cardio-surgical patientsOxygen saturation [SpO 2 ] during tracheal intubation: After initial pre-oxygenation and bag valve ventilation (T2), SpO 2 remained stable at T3 and T4. Data are means +/- standard deviation.Back to article page