ve To investigate the time course of potentiation of rocuronium produced by 1MAC of desflurane or isoflurane. Methods Twenty-four ASA I-II patients aged 18-60 years undergoing elective abdominal operation under general anesthesia were studied. Patients with neuromuscular, liver or kidney disease and those receiving any drug which may affect neuromuscular transmission were excluded. Premedication consisted of intramuscular phenobarbital 0.1 and atropine 0.5mg 30min before operation. Anesthesia was induced with midazolam 0.1-0.2 mg?kg-1, fentanyl 6?g.kg-1 and etomidate 0.3mg?kg-1 .Tracheal intubation was facilitated with rocuronium 0.6mg?kg-1 iv. The degree of neuromuscular block was monitored by measuring muscle response to TOF using accelerography (Biometer) . For maintenance of anesthesia the patients were randomly assigned to receive either propofol + fentanyl (control group) or 1 MAC of desflurane + propofol + fentanyl (desflurane group) or 1 MAC of isoflurane + propofol + fentanyl(isoflurane group). Rocuronium was continuously infused during operation to maintain T1 at 5 % of the control and the infusion rate was recorded every 15 min. Results There were no significant differences among the three groups with respect to sex, age, body weight and duration of anesthesia. In Des and Iso groups the infusion rate of rocuronium was reduced in an exponential manner and maximal potentiation occurred at 90 min of isoflurane or desflurane inhalation. The maximal reduction in infusion rate was 42.7 % in Des group and 37.6% in Iso group. There was no significant difference between the two groups.Conclusions Desflurane and isoflurane can potentiate the muscle relaxation produced by rocuronium in a similar degree and the potentiation is time dependent.

Objective To investigate the change in neuromuscular blocking effect of rocuronium induced by liver dysfunction. Methods Forty patients undergoing elective liver and biliary tract operation under general anesthesia were divided into 2 groups : (A) control group included 20 patients with normal liver function and (B) liver dysfunction group included 20 patients with obstructive jaundice. The premedication consisted of phenobarbital 0.lg and atropine 0.5 mg. Anesthesia was induced with midazolam 0.1 mg?kg-1,fentanyl 6?g?kg-1 and etomidate 0.3 mg?kg-1.The neuromuscular function was monitored by TOF stimulation of the ulnar nerve using accelerograph (Biometer).Rocuronium 0.6 mg?kg-1 was administered iv via the vein in the upper arm.The patients were intubated when T1 was 95% depressed and mechanically ventilated.PETCO2 was maintained at 35-40 mm Hg.The onset time (from the end of injection to T1=0),clinical duration of action (from the end of injection to 25% recovery of T1) and recovery index (T1 from 25% to 95% ) were recorded.MAP, HR and SpO2 were recorded before and at 5 and 10 min after rocuronium injection.Results The demographic data including sex, age and weight were comparable between the two groups. The onset time was (63?19) s in group A and (70?21) s in group B.The difference was not statistically significant. The clinical duration of action was (41?16) min in group A and (67?29) min in group B (P0.05).Conclusion Liver dysfunction induced by obstructive jaundice prolongs the clinical duration of action,but does not significantly affect the onset time of and recovery from rocuronium.

Objective To study the effects of glycyrrhizin on cerebral mitochondrial ATPase and membrane fluidity and malondialdehyde (MDA) and water content and brain function after cardiac arrest and resuscitation.Methods Eighteen dogs weighing 10-14 kg were randomly divided into 3 groups ( n = 6 each) : group A control; group B cardiac arrest and resuscitation and group C glycyrrhizin + cardiac arrest and resuscitation. The animals were anesthetized with fentanyl, intubated and mechanically ventilated and PaCO2 was maintained within normal range. The chest was opened. In group B and C cardiac arrest was produced by clamping of ascending aorta and coronary perfusion with hyperkalemic cardioplegic solution and maintained for 18 min and resuscitated by direct cardiac massage, adrenaline and defibrillation. The animals were observed for 8 h after spontaneous cardiac rhythm resumed. In group C glycyrrhizin injectio 40 ml?kg-1 was infused over 8 h as soon as spontaneous cardiac rhythm resumed. Brain function was evaluated according to Pittsburgh Brain stem score (PBSS). The animals were then killed and their brains removed for determination of (1) mitochondrial membrane fluidity and Na+-K+-ATPase and Mg2+ -ATPase activity and (2) brain MDA and water content.Results The mitochondrial membrane viscosity and cerebral MDA and water content were significantly higher and ATPase activity was significantly lower in group B (cardiac arrest) than in group A (control) . Brain function was also impaired by global cerebral ischemia-reperfusion (I/R) in group B. In group C glycyrrhizin infusion significantly attenuated the deleterious effects of cerebral I/R by reducing mitochondrial membrane viscosity and cerebral MDA and water content and increasing ATPase activity. Glycyrrhizin infusion also improved brain function.Conclusion Glycyrrhizin can ameliorate the deleterious effects of global cerebral I/R induced by cardiac arrest.

Objective To construct contains human interleukin-10 gene recombinant lentiviral-vector(LV-IL-10)and to form a basis to further explore the therapy of chronic pain.Methods hIL-10 gene fragment was isolated and amplified from pCYIL-10 plasmid by PCR,and was cloned into pWPXL-GFP.The inserted hIL-10 fragment was verified by Pme I digestion and DNA sequencing.The recombinant plasmid pWPXL-IL-10-GFP,envelope plasmid pMD2.G and packaging plasmid psPAX2 were cotransfected into 293T cells,to pack out lentivirus particle that has the ability of duplicated-deficiency,then virus titer determination was undertaken.Results The 530bp IL-10 gene fragment was amplified from pCYIL-10 plasmid by PCR,and was recombinated into pWPXL-GFP plasmid.DNA sequencing confirmed that the cloned gene segment was 100% homologous to the published hIL-10 sequence in genebank.High titer(2?1010)and highly purified lentiviral particles was obtained.Conclusions The lentivirus vector LV-hIL-10 was constructed successfully,which form a basis of research of chronic pain therapy.

Objective To investigate the relation between the expression of Bcl-2 protein and protection against ischemic neuronal damage by preconditioning with sublethal ischemia .Methods The cerebral ischemia was induced by occlusion of bilateral common carotid arteries .Sixty-three gerbils were divided randomly into four groups:sham operative control group (group A,n=5),ischemic preconditioning control group (group B ;n=6) with a single 2-min cerebral ischemia; ischemia preconditioning group (group PC,n=26) and ischemic control group (group IR,n=26) with 5-min ischemia being induced following 3 days of reperfusion with or without 2-min ischemic preconditioning,then with reperfusion lasting 4 hours (group PC1,n=5;group IR1,n=5),24 hours (group PC2,n=7;group IR2,n=7),72 hours (group PC3,n=7;group IR3,n=7)or 7 days (group PC4,n=7;group IR4 ,n=7) respectively.Paraffin sections of hippocampus were used for Bcl-2 protein immunohistochemical staining.Results In group B,Bcl-2 protein immunoreactivity (the intensity of staining) significantly increased as compared with that in group A(P

Objective To study the effects of selective mild cerebral hypothermia on endogenous anti-injury mechanism in brain tissue after cardiac arrest and resuscitation. Methods Fifteen healthy mongrel dogs of both sexes were anesthetized and intubated. Cardiac arrest was induced by potassium cardioplegia and cross-clamping of aorta, vena cava superior and inferior and azygos vein and maintained for 18min. The animals were randomly divided into 3 groups: group A, in which no cardiac arrest was induced, served as control ( n = 4) ; in group B animals received routine cerebral resuscitation ( n = 5) ; in group C animals received selective mild cerebral hypothermia (34℃?0.5℃) and routine cerebral resuscitation ( n = 6) . After successful resuscitation, the animals were observed for 8 hours. At the end of the experiment the parietal cerebral cortex was removed for determination of MDA, GSH, LA, FFA content and activities of SOD(T-SOD, Mn-SOD, Cu-ZnSOD) and GSH-Px. Results FFA and LA content of brain tissue in group B was significantly higher than those in group A (P

Objective To investigate the effects of intrathecal morphine on cell-mediated immunity. Methods Forty male SD rats weighing 250-300 g were randomly divided into 5 groups ( n = 8 in each group) : sham-operated group (F); saline group (NS) and 3 morphine groups (M1, M2, M3). The animals were anesthetized with intraperitoneal chloral hydrate 300-350 mg?kg-1 . Microspinal catheter was inserted into the subarachnoid space at the lumbar region according to modified Yaksh technique. Correct implantation of the spinal catheter was confirmed by aspiration of CSF. In the morphine groups, after 5 days morphine was continuously infused through the spinal catheter at 2.5 (Ml), 5.0 (M2) and 10 ?g?h-1(M3) for 7 days. In NS group normal saline was continuously infused instead of morphine. On the 7th day 5% formalin 50 fd was injected into the plantar surface of left hindpaw. The number of flinches, lickings and total time of licking were recorded for 60 min. Pain intensity scoring (PIS) (0-3, 0 = no pain, 3 = severe pain) was used to assess the antinociceptive effect of intrathecal morphine. The animals were killed after evaluation of pain intensity. Body weight and spleen weight were measured. Spleen index (spleen weight/body weight) was calculated. T-lymphocyte function was evaluated based on Concanavalin-A (Con A) induced splenocyte proliferation. Modified lactic acid dehydrogenase (LDH) release assay was used to assess NK cell activity. Results The PIS scores were significantly lower in group M1 , M2 and M3 than in F and NS group. The spleen index, splenocyte proliferation induced by Con A and NK cell activity were significantly suppressed in the 3 morphine groups Conclusion Intrathecal morphine has significant antinociceptive effect and suppresses T-lymphocyte proliferation and NK cell activity in a dose-dependent manner

Objective To investigate the effects of continuous spinal anesthesia with different concentrations and doses of ropivacaine on the ultrastructure of the spinal cord and nerve roots. Methods Twenty-four male SD rats weighing 220-280 g were anesthetized with intraperitoneal 10% chloral hydrate 300-350 mg/kg. A polyurethane microcatheter was inserted into the lumbar subarachnoid space according to the technique described by Yaksh. An 8-cm catheter segment was left in the subarachnoid space. The animals were randomized to receive normal saline, 0.5%, 0.75% or 1.0% ropivacaine 40 ? 1 intrathecally 3 times at 1.5 h interval. Six hours after the first intrathecal administration the animals were decapitated and L1 ,2 segment of the spinal cord and nerve roots were immediately removed for electron microscopic examination. Results Electron microscopic examination revealed that in animals which received intrathecal (i.t.) normal saline, 0.5% or 0.75% ropivacaine the neurolemma of the nerve roots and the mitochondria and endoplasmic reticulum of the neurons in the spinal cord were intact, while in animals which received i.t. 1.0% ropivacaine the neurolemma was stratified and partly disrupted and there were swelling of endoplasmic reticulum and vacuole degeneration. Conclusion Six hours continuous spinal anesthesia with 1.0% ropivacaine may be injurious to the spinal cord and nerve roots.

Objective To observe the effects of polyglucose and sodium chloride injection on treating hypotension of patients in postanesthesia care unit (PACU).Methods Everyone of thirty-two patients with hypotension in PACU received 500ml polyglucose and sodium chloride injection by venous injection at the velocity of 12ml?kg -1 ?h -1 .The mean arterial pressure (MAP),heart rate (HR) were recorded before administration and 5, 15,30,60 min after administration, the urine volume was measured at 1 hour after administration ,and the blood gas analysis were measured before injection and an hour after injection.Results The MAP increased significantly at 5min after administration,and the effects could last 60 minutes, the urine volume increased and the Hb and K + reduced remarkable after injection.Conclusions The administration of polyglucose and sodium chloride injection can effectively increase blood volume and blood pressure,and reduce blood transfusion,so might reduce complications of blood transfusion. [

Objective To compare the accuracy of bispectral index (BIS) and cerebral state index (CSI) used to measure depth of sedation during target-controlled infusion (TCI) of propofol. Methods After obtaining written informed consent we studied 20 ASA Ⅰ-Ⅱ patients aged 25-40 years undergoing elective operation under general anesthesia. The patients were premedicated with intramuscular atropine 0.5 mg. The electrodes of BIS and CSI were placed according to the instruction manuals before induction of anesthesia. Anesthesia was induced with TCI of propofol. The target effect-site concentration was set initially at 0.5 ?g?ml-1 followed by increments of 0.5 ?g?ml-1 every 5 min until 5 min after the patients lost consciousness and did not respond to pain stimulation (OAA/S= 0) . BIS and CSI were continuously monitored and their values recorded every 2-6 seconds. OAA/S score (5 = alert, 1 = loss of consciousness) was recorded every 20 seconds. Spearman correlation coefficient between OAA/S score and BIS and CSI and their prediction probabilities (Pk) were calculated. BIS05, BIS50, BIS95 and CSI05, CSI50, CSI95 at loss of consciousness (LOC) (OAA/S = 1) were also calculated.Results CSI arid BIS correlated well with sedation depth. There was no significant difference in the prediction probability between CSI and BIS. BIS05 and CSI05 were 79.1 and 74.9; BIS50 and CSI50 67.5 and 65.9; BIS95 and CSI95 55.9 and 56.8 respectively at LOC. Conclusion During TCI of propofol both CSI and BIS can be used to measure sedation depth fairly accurately. CSI appears to be more accurate then BIS in predicting both loss of verbal contact and LOC.