Among critically ill adults undergoing tracheal intubation, patients receiving bag-mask ventilation had higher oxygen saturations and a lower incidence of severe hypoxemia than those receiving no ventilation. Among the 401 patients enrolled, the median lowest oxygen saturation was 96% in the bag-mask ventilation group and 93% in the no-ventilation group. In a multicenter, randomized trial conducted in 7 ICUs in the United States, we randomly assigned adults undergoing tracheal intubation to receive either ventilation with a bag-mask device or no ventilation between induction and laryngoscopy.

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