Assessment of PPG & PAT to Detect Upper Airway Obstruction in Patients With Obstructive Sleep Apnea

Inclusion Criteria: * Patients twenty-one years of age or older Exclusion Criteria: * Patient refusal to participate in study * Patients under 21 (twenty-one) years of age, * Referring physician's refusal to have his/her patient participate in the study. * Patients with cardiac dysrhythmia (arrhythmia), including atrial fibrillation, and frequent premature atrial and/or ventricular contractions. * Inability to obtain a Sotera cuff pressure and/or PPG signals