Comparison of Pharyngeal Oxygen Delivery by Different Oxygen Masks

Subjects will breathe room air for 90 seconds. FiO2 will be measured for 30 seconds. Testing of masks will be performed with oxygen set at high flow through simple mask, non-rebreather mask, OxyMaskTM, and anesthesia mask with headstrap and Jackson-Rees circuit. After placement of each mask and starting oxygen, subjects will breathe normally for 90 seconds. FiO2 will be measured for 30 seconds. After each trial, subjects will take one vital capacity breath. Between testing each mask, subjects will breathe room air for 5 minutes to confirm stability of hemodynamic status. Respiratory rate and FiO2 data will be recorded during each breath to determine oxygen percentages. At the end of the 30 second sampling period, a final measurement will be taken during a forced vital capacity breath.