Anesthesia induction
MUSCLE RELAXATION
Before induction of general anesthesia, all children were given 0.01 mg/kg atropine by sedation to reduce airway secretions, and at the beginning of induction of anesthesia, midazolam (0.1 mg/kg), cis-atracurium (0.1 mg/kg), propofol (2 mg/kg), and sufentanil (0.4 μg/kg) were given sequentially under pure oxygen by mask inhalation (later assisted or controlled breathing). 3 to 5 min to be perfected by muscle relaxation and then tracheal intubation was performed under visual laryngoscope. (catheter diameter (with sleeve) = age/4 + 4; catheter insertion depth through the mouth = age/2 + 12 cm) [