In the present study, we observe perioperative findings of electroencephalogram in sedated and non-sedated elderly patients undergoing total knee arthroplasty under spinal anesthesia. Electroencephalogram is performed before, during, and 1 day after surgery.~After the induction of anesthesia, sedation is performed according to the patient's request. If a patient want to be sedated during surgery, one of the three sedatives (dexmedetomidine, propofol, and midazolam) is administered.
In the present study, we observe perioperative findings of electroencephalogram in sedated and non-sedated elderly patients undergoing total knee arthroplasty under spinal anesthesia.