Clinical Study of Dexmedetomidine Administered Intranasally to Relieve Perioperative Anxiety and Depression in Patients With Colorectal Tumors

Intranasal administration of dexmedetomidine (plain) was given at the bedside of the ward as per the pre-tested recommended dose. The patient's vital signs were maintained. On the day of surgery, 30 min before induction of anesthesia, intranasal dexmedetomidine (original solution) was administered in the operating room at the pre-tested recommended dose.