Investigators assess and compare postoperative sore throat and hoarseness in the group maintaining moderate relaxation and deep relaxation during operation.

In this sturdy, the deep block is applied when the surgeon requests for deep muscle relaxation to improve surgical field condition in the surgery such as laparotomy known that the deep block is helpful and in the other surgeries, the moderate block is maintained. The investigators assess the postoperative sore throat and hoarseness and compare the effect of muscle relaxation depth in the deep block group and moderate block group in terms of the incidence and severity of postoperative sore throat and hoarseness.

Inclusion Criteria:

• Requirement for mechanical ventilation under general anesthesia

Exclusion Criteria:

• Hoarseness and sore throat existed before surgery
• Upper respiratory infection
• Known or predicted difficult airway
• Liver, renal disease
• Requirement of postoperative ventilator care
• the operation within 2hrs
• Laparoscopic surgery
• Other positions except supine during surgery