Peripheral Nerve Stimulation to Reduce Hypoxic Events

Inclusion Criteria * Males and females \> 18 yrs old * Flemon's Score \> 15 * Able to provide written informed consent * Having gynecological, colorectal, orthopedic surgery, and urologic surgeries * Baseline oxygen saturation on room air \> 96% Exclusion Criteria: * Peripheral neuropathy involving the upper extremities * Procedures requiring direct admission to the ICU or any site other than the post-anesthesia care unit from the OR * Diagnosed obstructive sleep apnea (OSA) and / or use of continuous positive airway pressure (CPAP) or biphasic positive airway pressure (BiPAP) in the PACU. * Presence of any implantable electric devices, including internal defibrillators, pacemakers, or left ventricular assist device (LVAD) * Post-procedure temperature \< 35.5 Celsius or evidence of vasoconstriction * Presence of metal hardware in either arm or in either shoulder * Patients lacking access to the bare skin on an arm after surgery. * History of atrial fibrillation * History of bundle branch block * Females from menarche to menopause that do not have a current negative pregnancy test or surgical history preventing pregnancy.