Pre-oxygenation With Real Time End-tidal Oxygen Measurements Versus Single Breath Measurements

Inclusion Criteria: * Adults 18 years of age and older who are able to consent on their own without a legal representative * Self-identified as being in good health * Grossly normal dentition as judged by study investigators * No self-reported symptoms of upper respiratory infection or other infectious process * No history of severe pulmonary disease or asthma that requires daily use of an inhaler * Females participants self-report to not be pregnant at time of study enrollment * Study subjects will be recruited from within the Department of Emergency Medicine at Grady Memorial Hospital and Emory University Hospital Midtown. Study participants will be drawn from a pool that will include nursing staff, paramedical staff, students, residents, and attending physicians. Exclusion Criteria: * Participant does not agree to study enrollment * Participant cannot tolerate the entire course of non-invasive ventilation required to complete the study * Participant does not agree to the video recording of the oxygen monitor to ensure proper data transcription