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Objective To study the effects of arterial carbon dioxide tension(PaCO 2)on the quantitative electroencephalogram(qEEG)during isoflurane anesthesia Methods Fifteen ASA grade Ⅰ Ⅱ patients,scheduled for intraspinal or transspphenoidal surgery, were studied during 1MAC steady state isoflurane anesthesia qEEG were recorded continuously, while PaCO 2 approached approximately 26 5 mmHg, 35 2mmHg or 45 7 mmHg respectively randomly by regulating the minute volume Results Hypocapnia caused significant increases in all power bands (P

Objective:To determine whether mild hypothermia,isoflurane and propofol reduce gultamate release in rat hippocampus brain slices after hypoxia. Method: Brain slices preparations were separated and incubated from rat hippocampus. Glutamate released from rat brain slices during chemical anoxia(100?M KCN)were measured with a fluorescence assay,at 28℃,31℃ and 37℃ after anoxia and after administration of 1 MAC of isoflurane and 200 ?m propofol respectively. Result: Glutamate release was significantly reduced at 28℃ or 31℃ compare with that at 37℃ (P

The effect of transcutaneous stimulation to Hegu, Fengchi and Yuyao points with Han's Acupoint Nerve Stimulator on enflurane anesthsia and the hemodynamic changes during craniotomy were studied in 80 neurosurgical patients. The results showed that acupoint electric stimulation decreased the inhalating concentration and consumption of enflurane. The expired concentration of enflurane in HANS group was significantly lower than that in control group by a reduction of 37.8 % -47. 0%. The cardiovascular depression was lesser during operation, and the patients recovered faster and more stable after operation in HANS group. It was concluded that acupoint stimulation with HANS significantly potentiated the anesthetic effect and decraesed the side effect of enflurane.

90 bpm and nicardipine 10?g?kg-1 when MAP increased by 20% of the baseline value. Radial artery was cannulated for continuous BP monitoring and blood sampling. MAP, ECG, HR, SpO2 , PET CO2 and body temperature were continuously monitored during anesthesia. Blood samples were taken before induction of anesthesia (T1), when dura was cut (T2), when aneurysm was clipped (T3 ) and 30 min after clipping (T4 ) for determination of plasma concentrations of AT- Ⅱ , ET and CGRP by radioimmuno-assay.Results Plasma concentration of AT- Ⅱ and HR did not change significantly through out the study. Plasma CGRP concentration and MAP decreased significantly during operation at T2-4 as compared to the baseline values (T1 ) . Plasma ET concentration increased significantly at clipping (T3 ) as compared to that at T2. Conclusion The action of vaso-constrictors (AT- Ⅱ , ET) predominates over that of vaso-dilator during operation. It is important to prevent acute cerebral vasospasm during intracranial aneurysm clipping.

0 05) HR in group A was faster than that in group B at T 3 (P

Twenty-two neurosurgical patients were randomly divided into two groups:Group 1 iv drip midazolam and isoflurane inhalation;Group 2 isoflurane inhalation only. The hemodynamic indices and concentration of isoflurane were studied. The results showed that the blood pressure of all the patients were significantly decreased(PMO.01). The concentration of isoflurane in group 1 were .signicantly lowered by 27% than in group 2(P

Cerebral topographic map (CTM) and electroencephalogram (EEG) can evaluate the functional activity of brain, and the purpose of this study was to objectively compare the effect of intravenous anesthetics on brain. Forty-five patients, ASA grade Ⅰ-Ⅱ, undergoing neurosurgery,were randomly divided into three groups after administration of Innovar 2 ml, and then equivalent effective dose of propofol(2～2.5 mg/kg)(Ⅰ),sodium thiopental (4～6mg/kg)(Ⅰ) or gama hydroxybutyrate sodium (70～80mg/kg)(Ⅲ) was intravenously given respectively. All patients were monitored continuously during induction. The high frequent excitative activities of ? rhythm appeared immediately after each anesthestic was injected. During the most effective period: in group Ⅰ, there were no ? rhythm in EEG and obvious power change on CTM; in group Ⅱ irregular ? rhythm took place in EEG occasionally and great increase in top power on CTM occured, which showed evident elevation compared with group Ⅰ (P

Objective: To observe the effects of total intravenous anesthesia(TIVA)and spontaneous respiration on brain oxygen balance status in patients undergoing brain stem neoplasm resection. Method: Thirty patients,ASA grade Ⅰ-Ⅱ, received endotracheal intubation with spontaneous respiration and TIVA. TIVA was maintained with intravenous 0.2% lidocaine 2-3mg?kg~(-1). h~(-1),0.4% propofol 4-6mg?kg~(-1),h~(-1)and 1% ketamine 1-1.5mg?kg~(-1). h~(-1). Arterial and jugular bulb blood samples were taken before and after induction,sawing skull and removing trmor seperately to analyse blood gas. According to Fick principle, the level of CaO_2,CjvO_2 and C (a-jv)O_2 were calculated. Result:The hymodynamics, SaO_2 and CaO_2 remained stable during whole procedure. In comparison with the baselines. respiratory rate, minute volume, arterial blood pH and C(a-jv)O_2 were decreased, and PaCO_2.SjvO_2, and CjvO_2 were increased significantly (P

BACKGROUND: Conservative treatment of osseous gonarthritis (OG) is mainly to reduce the loading of knee joint and maintain muscle exercise,and non-steroidal anti-inflammatory drugs serve as supplements in case of acute occurrence.OBJECTIVE: To investigate the effect of combination of intraarticular in jection of hyaluronate and pain-point injection of betamethasone in improving the pain symptom in patients with OG.DESIGN: Open experiment.SETTING: Beijing Tiantan Hospital affiliated to Capital University of Medical Sciences.PARTICIPANTS: We selected 45 OG patients, who were aged 40 to 85years and received treatment in the clinic of Beijing Tiantan Hospital affiliated to Capital University of Medical Sciences between January 2004 and October 2004.METHODS: OG parenteral solution was intraarticularly injected into the knee joint, 2.5 mL once a week, 5 weeks set as a disease course. Pain points around knee joint were searched for following thorough physical examination. Anti-inflammatory analgesic solution of 2.0-3.0 mL was injected at each pain point. Physical examination was repeated before treatment in each week. Injection at pain points was maintained if they were still present. Intraarticular injection of hyaluronate was performed only when the pain points disappeared after treatment.MAIN OUTCOME MEASURES: ① Pain score at rest and at exercise.② Time when pain disappeared and times of betamethasone administration.RESULTS: Totally 45 patients entered the result analysis. ① Pain at rest and at exercise 1 week after combination treatment of intraarticular injection of hyaluronate and pain-point injection of betamethasone was ignificantly lessened compared to that before treatment (P ＜ 0.01). Pain relief was more significant at rest than at exercise (P ＜ 0.01). ② Pain disappeared at (17.07±6.00)days after treatment on average. The average times of betamethasone administration was (2.42±0.78) times. ③ No local joint pain and other adverse reactions occurred after administration in any case.CONCLUSION: Combination of intraarticular injection of hyaluronate and pain-point injection of betamethasone can effectively relieve the pain symptom of osseous gonarthritis, with no obvious adverse reactions.