More than 1.5 million critically ill adults undergo tracheal intubation each year in the United States. Hypoxemia is a common and serious complication during tracheal intubation in critically ill adults, occurring up to 10-20% of intubations in the emergency department (ED) or intensive care unit (ICU). Hypoxemia increases the risk of cardiac arrest and death. The effect of preoxygenation with noninvasive ventilation, as compared with preoxygenation with an oxygen mask, on the incidence of hypoxemia during tracheal intubation is uncertain. In this breakdown of a Journal Club article, Dr de Castro will cover a recent paper comparing NIPPV to oxygen mask only during preoxygenation for intubation.