Objectives: To compare the efficacy of patient-controlled epidural analgesia and patient-controlled intravenous analgesia in postoperative analgesia after spinal fusion. Methods: The CNKI, Wanfang, CBM, Pubmed, Embase, Ovid, Cochrane library databases were searched by computer. The randomized controlled trails with patient-controlled epidural analgesia or patient-controlled intravenous analgesia after spinal fusion published from May 1985 to July 2013 were selected. All of them were assessed by the standard of Cochrane systematic review. Data of postoperative VAS and the rate of side effects after using the analgesic drugs were extracted into an electrical sheet, which was synthesized by a Meta-analysis with RevMan 5.2 software. Re-sult: Eight randomized controlled trails involving 482 patients met the inclusion criteria. And the quality grade of 3 literatures was A, 5 literatures was B. The result of meta-analysis showed that: ①Visual analogue score(VAS). The postoperative first day′s VAS[WMD=-0.47, 95%CI(-0.74, -0.20)], second day′s VAS[WMD=-0.66, 95%CI(-1.14, -0.19)] showed that the patient-controlled epidural analgesia had a good analgesic effect compared with the patient-controlled intravenous analgesia, and both had statistic differences(P<0.05). No dif-ference in the postoperative third day′s VAS[WMD=-0.58, 95%CI(-1.38, 0.21)] was observed between the two methods, and no statistic difference(P>0.05); ②The side effects. The patient-controlled epidural analgesia had a higher incidence of skin itch[RR=1.53, 95%CI(1.08, 2.16)], paresthesia[RR=3.34, 95%CI(1.12, 9.98)] after surgery than the patient-controlled intravenous analgesia, and both had statistic differences(P<0.05). While two groups had no a significant deviation about nausea [RR=1.05, 95%CI (0.79, 1.40)], vomiting [RR=0.80, 95%CI (0.48, 1.31)], and no statistic difference(P>0.05). Conclusions: The patient-controlled epidural analgesia has better analgesic effects on the postoperative first and second day after spinal fusion, but obviously has a high-er incidence of skin itch and paresthesia than the patient-controlled intravenous analgesia.

Objective To compare the influence of different end-tidal concentrations of sevoflurane on transcranial electrical four-limb muscle motor evoked potential (MEP) monitoring. Methods Twenty ASA Ⅰ-Ⅱpatients aged 23-62 years undergoing craniotomy were enrolled. Triangular muscle, biceps brachii muscle, triceps brachii muscle, brachioradialis muscle, extensor digitorum communis muscle, abductor pollicis brevis abductor digiti minimi muscle, rectus femoris muscle, tibialis anterior muscle, gastrocnemius muscle and abductor hallucis were selected for MEPs recording. Sevoflurane was introduced at 0.5, 0.75, 1.0 and then 1.3 MAC (15 min each), and the effects on MEPs were studied. Results ①Maximum MEP amplitude was observed at abductor pollicis brevis muscle in upper limb and abductor hallucis muscle in lower limb at baseline and 0.5 MAC. Up to 1.0 MAC, there was no significant difference in MEP amplitude among extensor digitorum communis muscle, abductor pollicis brevis and abductor digiti minimi muscle. ②The success rate of MEP recording from abductor pollicis brevis muscle and abductor hallucis muscle was 100% during the administration of 0.5-1.0 MAC sevoflurane. ③The MEP amplitude was decreased and the latency was increased in a sevoflurane dose-dependent manner. Conclusions Abductor pollicis brevis muscle and abductor hallucis muscle were suitable for MEP monitoring during the administration of 0.5-1.0 MAC sevoflurane.

Objective To study the effect of magnetic field on serum activity of superoxide dismutase (SOD), content of malon-dialdehyde (MDA)and content of nitric oxide (NO)in patients undergoing operation for pituitary Tumor. Methods Sixteen ASA Ⅰor Ⅱ patients undergoing pituitary tumor surgery under general anesthesia were randomly divided into 2 groups (n=8 each): magnetic field group (M) and control group (C). Patients in magnetic field group were exposed in 150 mT magnetic field during the operation period.Blood samples were taken from radial artery for determination of serum SOD,MAD and NO before induction of anesthesia(T_0, baseline),after induction(T_1),70 min after induction(exposed in magnetic field for 60 min) (T_2)and 130 min after induction (exposed in magnetic field for 120 min) (T_3). Results There was no significant difference between the two groups in age, sex (M/F ratio),body weight,body height,duration of operation and duration of anaesthesia.The serum activity of SOD and content of NO were significantly higher at T_3 in group M than that in group C,and the serum content of MDA was lower at T_3 in group M than that in group C. Conclusions The magnetic field not only increases serum SOD activity and the content of NO in patient undergoing operation for pituitary tumor,but also reduces the content of MDA in them.

Objective To observe the effects of propofol or sevoflurane combined with remifentanil on cerebral blood flow (CBF) and cerebral autoregulation in patients undergoing gynecologic laparoscopic surgery. Methods Forty patients were randomly divided into two groups: the propofol group (group P, n=20) and the sevoflurane group (group S, n=20). Anaesthesia was induced with target-controlled infusion (TCI) of propofol and remifentanil in group P, with an inhaled induction of sevoflurane and TCI of remifentanil in group S, respectively. The depth of anesthesia was regulated according to bispectral index (BIS). The pressure of end-tidal carbon dioxide (P_(ET)CO_2) was kept at 35-40 mmHg by mechanical ventilation. The mean arterial pressure (MAP), heart rate (HR), pressure of arterial carbon dioxide (PaCO_2), P_(ET)CO_2, time-averaged peak flow velocity (TAP) and the transient hyperaemic response ratio (THRR) were recorded at 7 different time points: supine position (T_1) and supine lithotomy position before induction (T_2), the instant and 5 min after tracheal intubation (T_3,T_4), the instant and 15 min after abdominal CO_2 insufflation and trendelenburg-lithotomy position (T_5,T_6), and 10 min after the deflation abdomen (T_7), respectively. Results Compared with the baseline values at T_1, TAP was not significantly changed at T_2, T_5, or T_6 in group P, but was markedly decreased at T_3, T_4 and T_7. TAP in group S only decreased at T_4 and T_7, while it was much higher than that in group P at T_3. In group S, THRR was markedly lowered at T_3 compared with that at T_1; but in group P, it showed a significant increase at T_3. Conclusions Combined with remifentanil, propofol decreased CBF, but has no effect on the brain self-regulation. When inhaled in high concentrations, sevoflurane significantly reduces the brain self-regulation. Intraoperation pneumoperitoneum and postural factor significantly increase CBF, playing a stronger role than the narcotic drugs in clinical dosage (propofol, sevoflurane), without any influence on the brain self-regulation.

ve In order to improve the reliability of somatosensory evoked potentials (SSEP) monitoring during anesthesia, we compared the effects of three commonly used volatile anesthetics on SSEP to choose suitable volatile anesthetic and determine the appropriate end-expiratory concentrations which have least effects on SSEP monitoring. Methods Sixty ASA I - II patients undergoing elective intracranial surgery were randomly divided into three groups: group A received enflurane; group B isoflurane and group C desflurane. The demographic data including age, body weight, height and sex were not significantly different between the three groups. In addition to SSEP, ECG, BP, SpO2, PET CO2 and end-tidal concentration of inhalation anesthetic were monitored. The SSEP electrodes were placed on N13 on the neck and N20 on the scalp. Before experiment the patient was asked to lie quietly for 10 min, then the patient started breathing 100% O2 and fresh-gas-flow (FGF) was set at 5 L/min. Median nerve on one side was stimulated and SSEP waves from cortex and cervical spinal cord were recorded as baseline tracing before anesthesia. The concentration of inhalation anesthetic was gradually increased from 0 to 0.3, 0.5, 0.75, 1.0 and 1.5 MAC. Each concentration was maintained for 15 min and SSEP waves were recorded. During experiment if the patient developed respiratory depression, oral airway was inserted and assisted ventilation was performed to maintain PETCO2 at 35-45minHg. If the patient developed hypotension, fluid was infused at an increased rate and vasopressor was given if necessary to maintain normal BP (baseline ? 20 % ) . Results The three volatile anesthetics did not change N13 latency and amplitude. Increasing concentrations of enflurane, isoflurane and desflurane were associated with graded reduction in N20 amplitude and increase in N20 latency and N13-N20 interpeak latency. Conclusions The results suggest (1) cortical SSEPs are moresensitive to the volatile anesthetics than subcortical SSEPs, (2) end-tidal concentration of enflurane less than 0.75 MAC is compatible with effective SSEP monitoring, whereas the end-tidal concentration of isoflurane or desflurane compatible with effective SSEP monitoring was less than 1.0 MAC. Enflurane has greater effect on SSEP than isoflurane and desflurane.

Objective To evaluate the application of intra-aortic balloon counterpulsation(IABP) in acute myocardial infarction(AMI) with cardiogenic shock.Methods The study enrolled 65 AMI patients with cardiogenic shock and all the patients underwent primary PCI treatment.Among them,30 patients had IABP suppont during operations.Results In all the 30 cases with IABP support,the hemodynamic parameters improved in 30 minutes and stabilized in 2-8 hours.There was no reocclusion and death during querations.The death rate of the IABP group during hospitalization was 40%.Among the other 35 patients without IABP support,6 patients died during PCI and the in hospital death rate was 74.3%.Conclusion IABP can improve hemodynamic parameters and the perfusion of coronary artery in patients with cardiogenic shock.It can increase the success rate of primaty PCI,reduce the risk of low cardiac output and reocclusion during operation.IABP support during PCI can also improve the prognosis and reduce the motality rate of AMI patients with cardiogenic shock.

Objective To treat a group of patients with port wine stains (PWS) using a variable pulse width (VPW) frequency doubled Nd:YAG 532nm with high energy long pulse green (HELP G) laser and to evaluate the clinical efficacy, side effects and different histological changes between VPW and HELP G. Methods Thirty two patients with PWS were treated in order to study the clinical improvement by transforming from 11～16 J/cm 2 at 3 mm spot size (VPW,7～10 ms) gradually to 16～24 J/cm 2 at 4～5 mm spot size (HELP G,15～50 ms). Two patients were biopsied before and after the laser treatment.Results After treatment of 1～8 times(3.19 average), very good results were achieved in 7 PWS, and excellent results were achieved in 15 PWS.Improvement was found in 68.75 % of the patients.Conclusion VPW with HELP G laser at 532 nm appears to be an effective treatment for PWS.

Objective The present study was designed to compare the effects of different intra-abdominal pressure and the duration of pneumoperitoneum on splanchnic perfusion during laparoscopic cholecystectomy. Methods Fifty ASA Ⅰ or Ⅱ patients aged

Objective Controlled hypotension induced by different drugs may have different effects on splanchnic perfusion. The purpose of this study was to assess the effects of nicardipine- induced hypotension on splanchnic perfusion. Methods Twenty-three ASA Ⅰ-Ⅱ patients (14 male, 9 female) aged 21-60 yr undergoing meningioma resection were studied. The patients were premedicated with ranitidine 150 mg per os and atropine 0.5 mg i.m. Anesthesia was induced with propofol 1.5-2.0 mg?kg-1 , fentany1 2.0?g?kg-1 and vecuronium 0.1 mg? kg-1 and maintained with isoflurane inhalation and intermittent i. v. boluses of fentanyl and vecuronium. The patients were mechanically ventilated after tracheal intubation and PETCO2 was maintained at 33-35 mm Hg. Nicardipine-induced hypotension started from opening of mininges to the resection of tumor. 0.01% nicardipine infusion was started at 30 ml?h-1 and adjusted to reduce systolic blood pressure by 30% of the baseline or MAP to≥60 mm Hg. The adequacy of splanchnic perfusion was defined by gastric intramucosal CO2 tension (PgCO2), the intramucosal pH (pHi) and the difference between intramucosal and arterial PCO2(PCO2 gap) and was assessed before induction of anesthesia, the 1st, 2nd and 3rd hour during controlled hypotension and 1, 2 hour after termination of controlled hypotension. Results The MAP was maintained at about 62 mm Hg during controlled hypotension. The heart rate was stable. Hct was significantly decreased at 1st, 2nd and 3rd hour of hypotension compared with baseline but the mean Hct was greater than 30% . The intramucosal pH decreased slightly with no statistical significance and pHa, PaCO2 , PgCO2 and PCO2 gap were almost unchanged during controlled hypotension compared with the baseline values. Conclusion Nicardipine-induced hypotension is safe when MAP is maintained at≥60 mm Hg and has no adverse effects on splanchnic perfusion.

Objective To study the feasibility and reliability of median nerve somatosensory evoked potential monitoring in neurosurgery around the brain stem. Methods in selected 43 patients SEP N20, waveforms were recorded after stimulation of left and right median nerves respectively. Anesthesia was maintained with intravenous anesthetics throughout the operation. As soon as N20 waveform changed significantly, the surgeon was informed and the operative procedure was modified whenever possible. Results SEP waveforms were almost stable during maintaining with total intravenous anesthesia (TIVA). Within 43 cases, SEP waveform of & patients significantly changed. In these cases, SEP of 5 patients returned to normal gradually and no further neurologic dysfunction happened postoperatively. The other 3 cases did not recover, and postoperative neurologic complications happened. There was no false-negative or false-positive result. The correlation between intraoperative SEP changes and postoperative neurologic alterations was significant statistically. Conclusions SEP recording is a reliable technique for intraoperative monitoring during neurosurgery around the brain stem. TIVA is helpful for SEP monitoring.