“…Our ED has addressed the issue of human factors in determining the time of intubation and the use of end‐tidal CO 2 , which suggests an advantage of 20 seconds versus clinical gestalt to determine the onset of apnea during ED RSI. Finally, I understand that adding an additional quantitative tool to help measure the onset of apnea may increase the complexity of tracheal intubation in the ED, but considering that seconds matter for our most critically ill patients undergoing RSI in the ED, I recommend that future ED airway studies intending to measure intubation times also include the use of end‐tidal CO 2 measurements to best measure the onset of apnea.…”