Effectiveness of Sugammadex in LMS Surgery

Inclusion Criteria: * American Society of Anesthesiologist\[ASA\] class 1-3 * scheduled Laser microlaryngeal surgery under general anesthesia * written informed consent Exclusion Criteria: * suspected difficult tracheal intubation * disorder affecting neuromuscular blockade * known or suspected significant renal dysfunction * known or suspected severe hepatic dysfunction * history of malignant hyperthermia * allergy of opioids, neuromuscular blocking drugs or other medications used during general anesthesia * contraindication to pyridostigmine and/or atropine * pregnancy * breast feeding * body mass index \> 27kg/m2