Intubation sequence in weightlessness

Each subject alternatively performed five consecutive, non-randomized intubation attempts by using ice-pick conventional direct laryngoscopy or video laryngoscopy before switching position and device. One intubation attempt was performed per parabola. Each parabola started with the intubating operator holding the device in his/her right hand. After entering weightlessness, the intubating operator inserted the device in the manikin’s mouth and attempted to expose the glottis. The assistant operator handed over the endotracheal tube to the intubating operator, who then tried to insert it in the trachea. Each attempt ended either after tube insertion or at the end of the free-floating period. The time between parabolas (around 90 s) was used to check the position of the tube and to reset the experimental setup by the assistant operator. The intubation operator verbalized his confidence score, then inflated the cuff and auscultated the chest during manual bag ventilation.