ABSTRACT
Objective To evaluate the role of cholinergic anti-inflammatory pathway in dexmedeto-midine pretreatment-induced reduction of acute lung injury in a rat model of intestinal ischemia-reperfusion ( I∕R) . Methods Twenty-four healthy male Sprague-Dawley rats, aged 2-3 months, weighing 200-250 g, were divided into 4 groups ( n=6) using a random number table method: sham operation group ( S group) , intestinal I∕R group ( II∕R group ) , dexmetomidine group ( DEX group) and α7 nicotinic acetyl-choline receptor antagonistα-bungarotoxin (α-BGT) group (α-BGT group) . Intestinal I∕R was produced by occlusion of the superior mesenteric artery ( SMA) for 60 min followed by 120 min of reperfusion in anesthe-tized rats. Dexmetomidine 5 μg·kg-1 ·h-1 was injected via the tail vein at 1 h before operation in DEX group andα-BGT group. α-BGT 1μg∕kg was intraperitoneally injected at 15 min before dexmetomidine in-jection in α-BGT group. Rats were sacrificed at 120 min of reperfusion, and lung tissues were obtained for microscopic examination of pathological changes ( with a light microscope) and for determination of wet∕dry weight ratio ( W∕D ratio) , tumor necrosis factor-alpha ( TNF-α) and interleukin-6 ( IL-6) contents ( using enzyme-linked immunosorbent assay) , malondialdehyde ( MDA) content ( using thiobarbital acid method) and superoxide dismutase ( SOD) activity ( by xanthine oxidase method) . Results Compared with group S, the W∕D ratio and contents of MDA, TNF-αand IL-6 were significantly increased, and the SOD activi-ty was decreased in II∕R and α-BGT groups, and TNF-α and IL-6 contents were significantly increased in group DEX ( P<0. 05) . Compared with group II∕R, the W∕D ratio and contents of MDA, TNF-αand IL-6 were significantly decreased, SOD activity was increased (P<0. 05), and the pathological changes were significantly attenuated in group DEX. Compared with group DEX, the W∕D ratio and contents of MDA, TNF-α and IL-6 were significantly increased, SOD activity was decreased ( P<0. 05) , and the pathological changes were accentuated in group α-BGT. Conclusion Activation of cholinergic anti-inflammatory path-way is involved in the mechanism by which dexmedetomidine pretreatment reduces acute lung injury in a rat model of intestinal I∕R.
ABSTRACT
Objective To evaluate the efficacy of different concentrations and small dose of lidocaine of combined spinal epi-dural anesthesia(CSEA) in elderly patients with non-procedure for prolapse and haemorrhoids(PPH) anorectal surgery .Methods One hundred and twenty elderly patients undergoing non-PPH anorectal surgery were selected and randomly dividedin to 4 groups , the group A(1 .5% lidocaine) ,B(1 .0% lidocaine) ,C(0 .8% lidocaine) and D ,30cases in each group .The group A ,B and C adopted CSEA ,and the group D adopted the sacral anesthesia .The changes of mean arterial pressure(MAP) and heart rate(HR) at different time points ,stress reactions before and after operation ,anesthetic operating time ,effect onset time ,postoperative reactivating time , anesthetic grade ,success rate ,postoperative patient satisfaction ,postoperative surgeon satisfaction and urine retention were recor-ded .Results MAP and HR at different time points had no statistical difference among 4 groups(P>0 .05) .The anesthetic onset time and postoperative activity recovery time in the group A ,B and C were significantly less than those in the group D(P<0 .01) . The postoperative activity recovery time in the group A was longer than that in the group B and C .The urine retention time in the group A ,B and C was significantly less than that in the group D (P<0 .05) .The postoperative patient satisfaction and surgeon sat-isfaction in the group A and B were 100% .Conclusion 1% lidocaine CSEA is more suitable for the elderly patients with non-PPH anorectal operation .