Antagonism of Neostigmine in Continuous Infusion of Mivacurium

Inclusion Criteria: * 18 - 65 years old; * American Society of Anesthesiologists (ASA) physical stastus classification system: I-II; * Body mass index (BMI) 18.5 - 30 kg/m2 * Patients with normal cholinesterase levels before the operation Exclusion Criteria: * Refusal to participate in the study; * ASA classification of grade III or above; * Severe organ dysfunction, difficult airway or neurological muscle disorders; * Taking drugs that affect neuromuscular monitoring or neuromuscular conduction function; * Allergic to the test drug or having other contraindications; * Pregnant and lactating women