If intubation is unsuccessful at the first attempt, took longer than 120 seconds, or if desaturation noted on the pulse oximeter (defined as SpO2 < 92%) [13], the intubation attempt will be stopped and the lungs will be ventilated with an oxygen-volatile anesthetic mixture for 3 min. A second attempt will be allowed with the randomly allocated airway device. If intubation is unsuccessful after two attempts, the protocol allows intubating the patient with the anesthesiologist's instrument of choice. [14]