Background: In our clinical. experience, children who are crying before anesthesia are more likely to show agitated behavior on emergence. Methods: One hundred and ten boys aged 3-6 years old (ASA 1) who underwent circumcision were studied. The children were assigned to one of two groups, depending on their attitude during induction: the anxious group and the calm group. Anesthesia was induced by inhalation of halothane in oxygen, and was maintained at 1% throughout surgery. For intra- and post operative analgesia, caudal block with 0.5 ml/kg of 0.25% plain bupivacaine and topical infiltration with 1 to 2 mi of 1% lidocaine were provided for all patients. The incidence of delirium on emergence was compared between the groups. Results: We excluded 4 boys showing signs of incomplete pain relief. Twenty of 27 boys in the anxious group showed a significantly greater incidence of problematic behavior on emergence, compared to 5 of 79 in the calm group. Conclusion: The boys who were anxious before anesthesia showed a significantly greater incidence of problematic behavior on emergence from halothane anesthesia, compared with the boys who were calm before anesthesia.
