physiological end-point, incidence of adverse events, and changes in psychological status.

In the past, physiological goals, major morbidity and mortality were used as indicators of recovery after surgery. However, major morbidity and mortality rates were extremely low due to the development of surgery and anesthesia techniques, and measurements of these indicators do not adequately reflect postoperative recovery. On the other hand, the measurement of the patient's health status or quality of life has become an important metric in many clinical studies. The Quality of Recovery 40 Questionnaire (QoR-40) is a multidimensional tool that specifically assesses and develops anesthetic and postoperative health conditions. Severance Hospital is conducting an anesthesiologist-led prayer for the patient only for the desired patient before anesthesia. Although it may be expected that this preoperative airway may improve the quality of recovery after anesthesia / surgery by reducing patient anxiety, there is no objective study on this. The aim of this study was to investigate the effect of preoperative preoperative airway on the quality of postoperative recovery in patients who underwent thyroidectomy for thyroid cancer. I want to see. In addition, we will investigate whether preoperative airway affects sympathetic nervous system during surgery.

Inclusion Criteria:

• patients between 20 and 70 years old under ASA 3.
• obtaining written informed consent from the patients who were undergoing thyroidectomy.
• weights under 90 kg and BMI under 30

Exclusion Criteria:

• emergency operation
• re-operation
• combined surgery over 4 departments
• cardiac disease (unstable angina, congestive heart failure, valvular heart disease)
• Ventricular conduction abnormality
• prior pacemaker insertion
• uncontrolled hypertension (diastolic blood pressure > 110mmHg)
• bradycardia (HR < 40 Bpm)
• cerebral vascular disease (cerebral hemorrhage, cerebral ischemia)
• hepatic or renal failure
• patients who take antiarrythmic agent
• neurological or psychiatric illnesses
• foreigner and patient who can not read the letter