This study will include patients who have major surgery and are at risk for or have been diagnosed with sleep apnea. The patients will be monitored the night after surgery for repeating episodes of reduced breathing and oxygen levels. The study will determine if episodes of decreased breathing are reflected in the oxygen monitor.

There is no further detailed description available.

Inclusion Criteria:

• Patients older than 18 years undergoing thoracic, vascular, head and neck, gynecological, urological, general, orthopedic, and plastic surgery.
• Patient must require analgesia and/or sedation postoperatively by any route (intravenous, intramuscular, oral, epidural or intrathecal) for the duration of the study
• Postoperative patients with at least one anticipated over night stay on the general ward with a minimum length of 14 hrs.
• Patients in the ASA category 1-4
• Patients at high risk for obstructive sleep apnea (OSA) as identified by the STOP-Bang Questionnaire or patients previously diagnosed with OSA and not using a CPAP device. (No screening with STOP needed for these patients.)
• Spontaneous breathing

Exclusion Criteria:

• Age less than 18 years
• Patients receiving or anticipated to receive postoperative positive airway pressure support
• Previous allergic/contact reactions to adhesives
• Patients unable to give informed consent
• Pregnancy

Patients older than 18 years undergoing thoracic, vascular, head and neck, gynecological, urological, general, orthopedic, and plastic surgery.

30 days