Optiflow THRIVE for Delivery of Oxygen to Patients During Total Intravenous Anesthesia While Undergoing Radiology Procedures

Inclusion Criteria: * Signed consent for the study * Patients with an SpO2 greater than or equal to 95% while breathing room air * Patients requiring total intravenous anesthesia (TIVA) but not tracheal intubation during the proposed procedure - PLUS, any of the 2 following criteria: Body mass index (BMI) greater than or equal to 32 kg/m\^2, or neck circumference greater than or equal to 43 cm in a male and 41 cm in a female, or has been diagnosed with moderate to severe obstructive sleep apnea (OSA) with/without using a continuous positive airway pressure (CPAP) device * Full course head and neck radiotherapy less than or equal to 6 months (the peak onset time of acute facial and airway edema) Exclusion Criteria: * Significant pulmonary disease requiring supplemental oxygen in daily life (severe pulmonary fibrosis, severe chronic obstructive pulmonary disease, etc.) * Significant cardiac disease (including history of myocardial infarction \[MI\] with concurrent evidence of ischemic myocardial damage at the event, cardiomyopathy with impaired left ventricular ejection fraction to less than 50% or uncompensated congestive heart failure) * TIVA is contraindicate or having a proposed procedure without TIVA * Endotracheal intubation is required * American Society of Anesthesiologists (ASA) physical status classification 5 * Patients who are non-English speaking * Emergency procedures