Objective To evaluate the efficacy of caudal block with dexmedetomidine mixed with lidocaine for management of perioperative analgesia in children. Methods Thirty pediatric patients, aged 2-6 yr, weighing 8-23 kg, scheduled for elective unilateral high ligation of hernial sac, were equally and randomly assigned into either lidocaine group ( group L ) or dexmedetomidine mixed with lidocaine group ( group DL) using a random number table. Each patient received a single caudal dose of 1% lidocaine 1 ml∕kg in group L. Each patient received a single caudal dose of 1% lidocaine 1 ml∕kg mixed with dexmedetomidine 1 μg∕kg in group DL. Postoperative analgesia was assessed using FLACC scale. When FLACC score ≥4, ibuprofen suspension 10 mg∕kg was given orally. The consumption of ibuprofen was recorded within 8 h after operation. The onset time of caudal block and duration of analgesia were recorded, and adverse effects were observed. Results Compared with group L, the onset time of caudal block was significantly shortened, the duration of analgesia was prolonged, and the requirement for ibuprofen was decreased in group L. There was no significant difference in adverse effects between the two groups. Conclusion Addition of dexmedetomidine 1 μg∕kg to caudal lidocaine can significantly optimize the efficacy of caudal block with lidocaine alone for the management of perioperative analgesia in children.

Objective To study the value of 1.5T MRI in long-term follow-up of rat C6 glioma model and the efficacy of EGFR antisence RNA therapy in vivo.Methods Forty-three male Wistar rats, weighing 150 to 200 g, were used for this study. They were divided into four groups: group Ⅰ (7 normal rats); group Ⅱ (16 rats inoculated C6 cells in the right caudate nucleus); group Ⅲ (12 rats with the C6 gliomas treated with EGFR antisence RNA by in site injection); and group Ⅳ (8 rats inoculated C6 cells transfected with EGFR antisence RNA in the right caudate nucleus). Group Ⅰ was examined by plain and enhanced MR scanning. Group Ⅱ-Ⅳ were followed up by plain and enhanced MR scanning and were sacrificed in variable time points for pathological examination.Results Cerebral hemispheres of normal rat were shown clearly on the MR image. The tumor could be seen about 1 week after inoculation. According to the findings on the follow-up MR scan, we could observe growth of the tumor or its regression after treatment. The tumor growth was significantly inhibited in group Ⅲ and group Ⅳ as compared to those in group Ⅱ.Conclusion The growth of the rat C6 glioma model and its change after treatment could be shown clearly in 1.5T MR imaging; EGFR antisence RNA significantly inhibited the growth of glioma in vivo.