Overview Ketamine in Robot-assisted Thyroidectomy Status: Unknown status Trial end date: 2014-12-01 Target enrollment: Participant gender: Summary In this prospective double-blinded study, The investigators compared acute postoperative pain and rescue analgesic demand during postoperative period after robot thyroidectomy between ketamine and placebo groups. Phase: N/A Details Lead Sponsor: Seoul National University HospitalTreatments: Ketamine