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Objective To prepare the rat model of type 2 diabetes mellitus (T2DM), and to ob-serve the characteristics of peripheral neuropathy. Methods High fat and high sugar diets were fed for 8 weeks to induce insulin resistance and then low dose streptozotocin ( STZ) was injected intraperitoneally to induce type 2 diabetes mellitus models in Sprague Dawley rats. Blood glucose and serum insulin levels con-tinuous were monitored. Tactile allodynia in response to von Frey ( VF) filament stimulation of the plantar hind paws and paw withdrawal thermal latency ( PWTL) to plantar test were used as the criterion for diabetic neuropathy. Instruments AD was used to detect nerve conduction velocity ( NCV) of sciatic nerve in rat and the morphological and pathological changes of sciatic nerve were detected by electron microscope. Results The characteristics of T2DM rats by peripheral neuropathy in this method were that 50％ force withdrawal threshold and PWTL were measured. Both values of diabetic rats were decreased from the day of STZ injec-tion until 4 weeks after STZ injection, and then increased 8 weeks after STZ injection (50％ force withdraw-al threshold values, (11.8 ±0.8)g, (8.4 ±0.7)g and (16.2 ±1.4)g; PWTL (10.2 ±0.9)s, (8.3 ± 1. 2)s and (13. 2 ± 1. 0)s. These results indicated that tactile sensation changed from hypersensitive to hy-posensitive. Compared to the NC group, the sciatic nerve motor and sensory conduction velocity were signifi-cantly decreased at 4 and 8 weeks in DM group, respectively. Compared to DM group at 4 weeks, the sciat-ic nerve motor and sensory conduction velocities were further decreased in the DM group at 8 weeks. Con-clusively, sciatic nerve showed obvious demyelination and axonal collapse. Conclusions T2DM rat model was successfully induced by high fat and sugar diet combined with small dose of STZ injection. The rat mod-el has typical pathological change of peripheral nerve. It might provide a particularly advantageous tool for investigations of diabetes and its chronic complications.
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Objective To evaluate the effect of diabetic peripheral neuropathy on peripheral neurotoxicity induced by local anesthetics in rats.Methods Sixty healthy adult male SPF Sprague-Dawley rats,aged 6 weeks,weighing 150-180 g,were divided into either control group (n =18) or diabetic peripheral neuropathy group (n=42) using a random number table.The rats were fed a high-fat and high-sucrose diet for 8 weeks,and streptozotocin (STZ) 30 mg/kg was injected intraperitoneally to induce diabetes mellitus which was confirmed by blood glucose level≥ 16.7 mmol/L.The mechanical paw withdrawal threshold to yon Frey filament stimulation and thermal paw withdrawal threshold were measured.The decrease in reaction thresholds to thermal and mechanical stimuli (changing from sensitivity to insensitivity) was observed after STZ injection.At 4 weeks after STZ injection,the rats showing a marked hyperalgesia served as early diabetic group.At 8 weeks after STZ injection,the rats showing a marked insensitivity to pain served as late diabetic group.Experiments were carried out in early or late diabetic rats,and ordinary Sprague-Dawley rats of the same age were used as control group.Left sciatic nerve block was performed with 2％ lidocaine 0.2 ml.Before the sciatic nerve block and at 1 week after the sciatic nerve block,the nerve conduction velocity of the left sciatic nerve and F-wave minimal latency were measured,and the sciatic nerve block time was recorded.Results Compared with the baseline before block,the nerve conduction velocity was significantly decreased,and the F-wave minimal latency was prolonged in late diabetic rats (P＜0.05).Compared with control group,the sciatic nerve block time was significantly prolonged in late diabetic group (P＜0.05).Conclusion Diabetic peripheral neuropathy aggravates peripheral neurotoxicity induced by local anesthetics in rats.
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Objective To evaluate the effect of the electronic anti-nausea instrument on the postoperative nausea and vomiting of patients with gynecological laparoscopic surgery.Methods One hundred and eighty patients for gynecological laparoscopic surgery were enrolled and randomized into 2 groups with 90 patients in each.Patients in group T accepted patient-control transcutaneous elec-troacupoint stimulation at P6 (Neiguan)point from the time before the induction of anesthesia to 24 h after surgery.Patients in group C accepted the same device of electronic anti-nausea instrument with-out transcutaneous acupoint stimulation.Data were recorded of the nausea and vomiting in postopera-tive 2,6,12 and 24 h respectively.Results The incidence and severity of nausea at 6,12 and 24 h and vomiting at 6,24 h after operation in group T were both lower than those in group C(P < 0.05 ). Conclusion With patient-control transcutaneous acupoint stimulation at P6 point,the incidence of both early PONV and late PONV are reduced in patients with gynecological laparoscopic surgery.
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ObjectiveTo study the effects of different priming dose of muscle relaxant at the onset and endotracheal intubation conditions.Methods120 ASA Ⅰ～Ⅱ grade patients were randomly divided into 6 groups (n=6),vecuronium group (V 1,V2,V3) and cis-atrscurium group (C1,C2,C3).All patients were induced with propofol plasma (TCI)3 μg/ml,fentanil3 μg/kg.The V1 and C1 group were not given priming dose,and the V2,V3,C2,C3 groups were given priming dose of 10 μg/kg,20 μg/kg vecuronium and 15 μg/kg,30 μg/kg cis-atracurium.Intubating conditions were evaluated,and the onset time was monitored with train-of-four (TOF) technique.ResultsIntubating conditions were excellent in all patients.The onset time of priming groups of the four different doses was significantly shorter than that of the nonpriming group [(80.5±7.2) vs (146±10.7);(79.8±6.5) vs (146±10.7);(138.5±7.2) vs (218±10.7) ; (127.1±6.5) vs (218±10.7),P ＜ 0.05 ].ConclusionsThe taking-effect time of priming dose of muscle relaxant was significantly shorter than that of the nonpriming dose group.Increasing the priming dose not decrease onset time more than the smaller dose.
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Objective To compare pharmacodynamics of vecuronium administered according to body surface area and body weight during general anesthesia.Methods Forty ASA Ⅰ or Ⅱ patients,aged 18-64 yr,weighing 40-85 kg,undergoing general anesthesia,were randomly divided into 2 group ( n =20 each ).The patients received vecuronium 2× ED95 based on body weight (group W) or based on body surface area (group S).Anesthesia was induced with propofol 2 mg/kg,fentanyl 3 μg/kg and vecuronium 0.1 mg/kg ( group W) or 2.824 mg/m2 (group S).The patients was tracheal intubated and mechanically ventilated when the maximal depression of T1 was achieved.PET CO2 was maintained at 35-45 mm Hg and BIS value was maintained at 40-50.The intubation condition was evaluated using Cooper's score.The onset time,maximal depression of T1,duration of clinical action,recovery index,duration of pharmacological action and amount of vecuronium consumed were recorded.The coefficient of variation for all the indexes mentioned above was calculated.Results There was no significant difference in the coefficient of variation for intubation condition,onset time,duration of clinical action,recovery index,and duration of pharmacological action between the two groups ( P ＞ 0.05).Compared with group W,the coefficient of variation for the maximal depression of T1 and amount of vecuronium consumed were significantly decreased in group S ( P ＜ 0.05).Conclusion Vecuronium 2 × ED95 administered according to body surface area can reduce the individual variation in pharmacodynamics during general anesthesia.
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Objective To investigate the effects of valproic acid (VPA) on acute lung injury induced by Lipopolysaccharide in rats. Method The rat model of acute lung injury was made by intravenous injection of lipopolysaccharide (LPS). The pathological changes of lung were observed under light microscope and inflammatory cytokines in serum detected by using ELISA to judge whether the model was successfully done or not. All rats were divided into three groups as per the different intervention agents employed. Rats in control group were treated with intravenous injection of NS in dose of 5 ml/kg, rats in LPS group were exposed to LPS with dosage of 10 mg/kg and model rats in LPS + VPA group were treated with VPA in dose of 300 mg/kg. The rats were sacrificed 6 h after LPS or NS administration. The blood PaO2 ,A-aDO2 and blood lactic acid (Lac) were measured, the lungs were removed for observing the histopathological changes and determination of wet/dry lung weight (W/D) ratio and myeloperoxidase (MPO) activity as well as albumin concentration in broncho-alveolar lavage fluid (BALF) . Seurm was collected to determine the concentrations of tumor necrosis factor-a (TNF-α) and interleukin-1β( IL-1 β) by using LISA 6 h later. All data were presented in ((x)±s). One-way ANOVA was used for comparing differences between groups. Results Compared with acute lung injury group, the blood PaO2 (94. 50 ± 4.38 ) in rats of LPS + VPA group was higher, whereas A-aDO2 ( 13.50 ± 4.77 ) and blood lac( 2.13 ± 1. 02 ) in LPS + VPA group were lower. VPA significantly lowered W/D (5.33 ±0. 12) ratio and MPO activity (4.38 ±0. 42) in the lung. Albumin concentration ( 1. 260 ± 0. 039 ) in BALF, and the levels of TN F-α( 2 410 ±320 )and IL-1β( 1 220 ± 162 )in serum were lower in LPS + VPA group. The histological changes of lung injury were lessened by VPA. Conclusions Valproic acid has protective effects against lipopolysaccharide-induced acute lung injury in rats.
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Objective To evaluate patient-controlled epidural analgesia (PCEA) with morphine on breastfeeding neonatal neurological arid adaptive capacity after cesarean section.Methods Thirty healthy parturients after cesarean section under epidural block were randomly selected as test group, and thirty healthy parturients with natural childbirth served as control group without any opioids administration. In test group the patients received PCEA after cesarean section. The regimen included a loading dose of morphine 2mg, bupivacaine 12.5mg and droperidol 0.5mg in 10ml of normal saline, followed by background infusion at 2 ml?h~(-1) with an 2ml bolus dose and a 20min lockout interval. The PCEA solution contained morphine 20mg, bupivacaine 125mg and dreporidol 5 mg in 100ml of normal saline. The samples of intravenous blood and colostrums were taken 2, 4, 8,12 and 24 h after the loading dose administration for measurement of plasma and colostrums concentrations of morphine. The neonatal neurological and adaptive capacity scores(NACS) of both groups were recorded at corresponding time points, Results Concentrations of morphine in colostrum and plasma kept decreasing following the loading dose administration. There was a significant positive correlation between concentrations of morphine in colostrum and plasma (r=0.998, P
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0.05). The core temperature, levels of TNF-?,IL-6 and IL-8 were lower at t2 and t3 in group Ⅱ than those in group Ⅰ (P