Objective To investigate the changes in cerebral cAMP and PKA levels during development of acute opioid tolerance induced by remifentanil and to determine whether post-receptor cAMP/PKA signaling pathway is involved in the process. Methods Fifty-six male Kunming mice weighing 25-35 g were randomly divided into 5 groups: group Ⅰ control (C) (n=8); group Ⅱ received morphine infused intraperitoneally (IP) at 0.6 μg'kg-1·min-1 for 120min(M) (n=8); group Ⅲ,Ⅳ,Ⅴ received remifentnil infused IP at 0.4, 0.8 and 1.6 μg·kg-1·min-1 for 120 min(R1=8, R2n=8; R3 n=24).Control group received IP infusion of normal saline. Tail-flick test was performed td measure the response of animals to a thermal nociceptive stimulus before IP infusion, at 30, 60, 90 and 120 min after beginning of IP infusion and at 15, 30, 45 and 60 min after termination of IP infusion. Eight animals were decapitated at 60 min after termination of IP infusion in all 5 groups and the other 16 animals in group R3 were decapitated at 30 and 45 min after termination of IP infusion (n=8 each) for determination of intracellular contents of cAMP and activities of PKA in cerebral cortex and inferior colliculus-striatum by ELISA or radioactive isotope [32p,] ATP-catalyzing assay. Results The tail-flick latency was significantly prolonged during IP infusion as compared with the baseline before infusion in group M, R1 , R2 and R3 but became significantly shorter at 30 and 45 min after infusion than the baseline values in group R1, R2 and R3indicating hyperalgesia after remifentauil infusion. The cerebral contents of cAMP and PKA activities at 60 min after termination of infusion were comparable or decreased in group M, R1, R2 and R3 as compared with group C. There was no significant difference in cerebral cAMP contents and PKA activities at 30, 60 and 45 min after IP remifentanil infusion in group R3. Conclusion Remifentanil can induce acute hyperalgesic effect on mice, and there is no up-regulation of post-receptor cAMP/PKA signaling pathway in the acute opioid tolerance, which is not similar to that chronic opioid tolerance.

Objective To study the sedation efficacy of propofol combined with midazolam and /or fentanyl in fibreoptic choledochoscope. Methods Ninty outpatients were randomly divided into three groups. Group PF (n=31)was given fentanyl 0. 05 m.g plus propofol 1 mg/kg intravenously, group PM (n=29) midazolam 2 mg plus propofol 1 mg/kg, and group PMF(n=30) fentanyl 0. 05 mg, midazolam 2 mg and propofol 1 mg/kg. Propofol 20 mg was used when needed. HR,MAP,SpO_2,sedation scores and amnesia were recorded. Results All patients were awakened in 20 minutes after procedures. The recovery time was shorter in group PF than that in the other two groups. There were 21(67. 70%) patients in group PF, who were aware of surgery. Fifteen(48. 4%) patients were satisfied in group PF. Conclusion Propofol combined with midazolam and /or fentanyl in fibreoptic choledochoscope has better sedation without any obvious side effects.

Objective: To study the effects of the different doses of midazolam in fibreoptic gastroscopy on sedation, respiratory and circulatory function. Method: One hundred and four outpatients undergoing fibreoptic gastroscopy were randomly divided into four groups. The control group(N)was not given drugs, the other groups were intravenously given midazolam 0.07mg/kg(MS),0.05mg/kg(M),diazepam 10mg(D)respectively. The sedative scores, symptom, amnesia,HR,MAP and blood gases were observed. Result: The sedative scores of MS,M and D groups were much better than that of control group. There were significant differences in sedative scores,amnesia and sedative period between MS group and D group or M group. MAP decreased one minute after administering the drugs in MS,D and M groups significantly. The results of blood gases analysis of all groups were in normal ranges. Conclusion: Midazolam 0.07mg/kg can produce safe and effective sedation for fibreoptic gastroscopy.

Laparoscopic anatomical hepatectomy of segment 7 is recognized as one of the most difficult hepatectomies. Because of its location and anatomic characteristics, the resection of hepatic segment 7 has the difficulties of poor surgical view, instrumental accessibility, hepatic pedicle anatomy, confirmation of dividing line and secure hemostasis. When performing laparoscopic anatomical hepatectomy of segment 7, the authors routinely put patient at left semi-decubitus position, set all trocars at the right upper quadrant of the abdomen, and select proper approach for hepatic pedicle anatomy according to the results of individualized preoperative three-dimensional reconstruction. The authors use to transect the liver parenchyma at the plane between hepatic segment 6 and segment 7, with the direction perpendicular to the right hepatic vein, and then finish parenchymal dissection using right hepatic vein as the intrahepatic landmark. According to the authors experiences, choosing appropriate tactics can effectively reduce the difficulty of laparoscopic anatomical hepatectomy of segment 7, improve the safety and controllability of operation, and ensure the oncological radical effects.

Objective To study the difference of Han male children and adolescent bone age of wrist-hand in Beijing and Guangzhou.Methods Bone age (BA) of left hand-wrist was assessed using X-ray by two radiologists based on CHN atlas method in 993 healthy children and adolescents (age range:1.0-19.0 years).The radiologists were blinded to the chronological age (CA) of those children.The interobserver variations were analyzed for evaluating the reliability of CHN Atlas method.The difference between CA and BA were separately assessed,and were analyzed by t test.Results Close correlation was found between BA and CA (r =0.969,0.957,P ＜ 0.01) in both two regions.The bone age was advanced at 1.0-3.9,and 7.0-15.9 years in Beijing boys,and at 1.0-2.9,6.0-7.9 years in Guangzhou bpys.There was significant difference at 1.0-1.9,9.0-14.9 years between Beijing and Guangzhou.Conclusions The bone age of Han male children adolescent in Beijing and Guangzhou area has the characteristic of acceleration.There is significance difference at some years between Beijing and Guangzhou,and the results can provide potential value for the further study of BA and clinical medicine.

Objective To evaluate the therapeutic effect of Yin-Huang pills combined with Banlangen granule therapy on upper respiratory infection.Methods 120 cases of acute upper respiratory infection were randomly separated into an experiment group and a control group.The experiment group was treated by Yin-Huang pills combined with Banlangen granule;while the control group was treated by Yin-Huang pills.Results There was significant difference of cure rate between the experiment group(75%)and the control group(51.6%),with P＜0.01.There was no significant difference of total effective rate between the experiment group(96.6%)and the control group(88.3%),with P＞0.05.Conclusion Yin-Huang pills combined with Banlangen granule therapy was more effective in controlling acute upper respiratory infection,and this therapy caused few adverse effects.

Objective To evaluate the correlation between the dynamic enhanced CT signs of hepatocellual carcinoma(HCC),MVD and VEGF expressions in hepatocellular carcinoma.Methods The MVD and VEGF expression were examined by means of SP immunohistochemical technique in 45 cases of HCC proved by pathology.All patients were examined by plain and contrast-enhanced CT.Results(1)The relation of pathologic grade,MVD and VEGF:the MVD in HCC of grade Ⅰ,Ⅱ,Ⅲ,Ⅳ were 22.9 ± 12.6,36.7 ±16.2,51.1±17.3,67.8±21.4,VEGF positive rates in HCC of grade Ⅰ,Ⅱ,Ⅲ and Ⅳ were 28.6%(2/7),53.3%(8/15),90.9%(10/11)and 100.0%(12/12).The pathologic grading of HCC was positively correlated with MVD and VEGF expression,in grade Ⅰ and grade Ⅲ～Ⅳ,Ⅱ and grade Ⅳ(P＜0.05).There were no statistical correlation between Ⅰ and Ⅱ,Ⅱ and Ⅲ or between Ⅲ and Ⅳ(P＞0.05).(2)There were three blood supply types in HCC at contrast-enhanced CT,the MVD ad VEGF positive rates were 70.6±22.9 and 85.l%(23/27)in tumors with arterial blood,65.7±21.6 and 63.6%(7/11)in those with double blood supply,and 25.1±13.5 and 28.6%(2/7)in those with poor blood supply.There was statistical difference(P＞0.05)in VEGF expression between the tumors with arterial blood,arterial combining with double blood supply and poorly blood supply.In HCC with arterial and double blood supply,MVD expression level was higher than that with poor blood supplies(P＜0.01).Conclusion MVD and VEGF expression can reflect the tumor's cell differentiation of HCC in a certain degree.

Objective To study the neuroprotective effect of sevoflurane on controlled hypotension in patients with coronary heart disease undergoing craniocerebral surgery. Methods Twenty-six patients with coronary heart disease undergoing craniocerebral surgery were randomly divided into two groups,receiving either inhaled 2%-5%sevoflurane plus intravenous sodium nitroprusside (treatment group,n=13) or intravenous sodium nitroprusside 3-8 μg·kg-1 alone (contorl group,n=13) for blood pressure control. The hemodynamic changes were recorded during the operation. Patient satisfaction with surgeons and the duration hospital stay after surgery were recorded. The levels of cardiac troponin I (TNI),creatine kinase-MB (CK-MBM),neuron specific enolase ( NSE) and S100 calcium binding proteinβ( S-100βprotein) in serum were detected at one day pre-operation,the end of the operation,and one day post-operation. Results The duration of hospital stay after surgery was significantly shortened in treatment group [(20. 3±3. 8) versus (23. 9±4. 6) d,P<0. 05) compared with control group. The average heart rate significantly decreased, patient satisfaction significantly increased, and serum levels of NSE and S-100β protein one day post-operation significantly decreased as compared to control group (all P<0. 05). Compared with the day before operation,serum levels of NSE and S-100βprotein in the two groups increased significantly at the end of surgery (P<0. 05),and the levels of TNI,CK-MBM,NSE and S-100βsignificantly elevated one day post-operation (P<0. 05). Compared with the end of operation,serum levels of NSE and S-100βin contorl group incarcerated remarkably (P<0. 05) Conclusion Sevoflurane plays an important neuroprotective role,as evidenced by improving patients' satisfaction,reducing hospital stay after surgery,and maintaining the balance of myocardial oxygen delivery and consumption in craniocerebral surgery patients with coronary heart disease during controlled hypotension. However,it can not prevent postoperative myocardial injury in these patients.

Objective To investigate the mechanism of the protective effects of olanzapine against apoptosis of PC12 cells induced by ?-amyloid peptide 25-35 (A?_ 25-35 ). Methods Based on the model of apoptosis of PC12 cells induced by A?_ 25-35 , cell viability was determined by MTT assay. The expressions of Bax, Caspase-3 of PC12 cells induced by A?_ 25-35 and olanzapine were assessed by Western blot. Results 10 -14 -10 -5 mol/L A?_ 25-35 lowered the cell viability of PC12 cells, 50?mol/L and 100?mol/L olanzapine pretreatment enhanced the cell viability of PC12 cells, and there was significant difference compared with olanzapine non-pretreated groups (P