The Effect of Real-time Binaural Sound on Sedation Using Dexmedetomidine

Inclusion Criteria: * Adult patients undergoing sedation with dexmedetomidine during spinal anesthesia for surgery with an estimated time of 90 minutes or longer Exclusion Criteria: * ASA physical status classification 3-4 * Patients with hearing loss or using hearing aids * Patients who received narcotic analgesics or sedative drugs within 1 week * Patients with alcohol dependence or drug dependence * Patients with drug hypersensitivity to dexmedetomidine * Patients with arrhythmia, cardiovascular disease, decreased cardiac function and decreased cardiac output * Patients who are judged to be difficult to use sedative drugs due to severe respiratory disease * Patients with liver failure * Patients with kidney failure or on dialysis * Patients judged to be unsuitable for the clinical trial by the researchers * Patients whose actual operation time is less than 30 minutes