Background: Considering the lack of studies to investigate the effect of atropine administration on delirium incidence in a post-anesthesia care unit (PACU) in children, this study was conducted with the aim of investigating the effect of atropine administration on delirium incidence and other complications in children undergoing surgery. Methods: The present double-blind, randomized clinical trial was conducted on 70 children aged 1 - 6 years that were candidates for lower abdominal surgery. The patients were assigned to two groups, each consisting of 35 patients. Before induction of anesthesia, 0.02 mg/kg of atropine and 0.02 mg/kg of normal saline were administered intravenously in the first (atropine) and second (control) groups, respectively. Patients' mean arterial blood pressure (MAP), heart rate (HR), and incidence of complications after surgery were recorded. Results: The results of the present study revealed that the two groups had no significant difference in terms of the mean MAP in any of the studied times (P-value> 0.05). However, the mean HR during surgery was significantly higher in the atropine group compared with the control group (P-value < 0.05). In addition, although the incidence and severity of delirium in the atropine group were insignificantly higher than that of the control group, respiratory complications such as decreased saturation and laryngospasm were lower in the atropine group compared with the control group (P-value > 0.05). The volume of suctioned secretions in the atropine group, with a mean of 6.26 +/- 2.47 cc was significantly lower than its volume in the control group, with a mean of 14.57 +/- 4.27 cc (P-value < 0.001). Conclusions: According to the findings of the present study, although the administration of atropine slightly increased delirium incidence, it could reduce the incidence of respiratory complications and secretions after surgery. However, more studies are required to make a more definitive conclusion in this respect.
