Effects of Propofol on Respiratory Adverse Events During Extubation in Children Undergoing Tonsil Adenoidectomy

Inclusion Criteria: * age: 3\~8 years old, * general anesthesia for tracheal intubation in ASA Grade I to III patients undergoing tonsil adenoidectomy, * the operation time is 10\~60 minutes, * sign informed consent. Exclusion Criteria: * patients with congenital heart disease, tumor, severe lung disease, liver and kidney function disease, nervous system disease, coagulation dysfunction, etc, * children who do not consent to the test.