What's the First Sign in a Rapid Response?

There is going to be a lag between your intervention and the change in the pulse ox reading. So do not panic if after you turn up the FiO2 or you apply non-invasive ventilation, give the patient a chance to cooperate. It takes some time from the blood to go from the heart to the fingertip where presumably the pulse oximeter is actually attached. Paul: How do you recognize someone who's not protecting their airway?