Oxygen Monitoring of Patients After Surgery on the Hospital General Care Floor

Inclusion Criteria: * Age of 18 years or older * Discharge from the post-anesthesia care unit (PACU) to the GCF after any of the following major surgeries: bariatric surgery, major orthopedic surgery (e.g., total hip replacement), major general surgery (e.g., bowel resections, open cholecystectomy), and major gynecological surgery (e.g., radical hysterectomy) Exclusion Criteria: * Pre-existing central neurological disease, including but not limited to recent traumatic brain injury, stroke, and neurodegenerative disease * Ongoing use of mechanical ventilation or continuous positive airway pressure in the GCF