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作 者:高志荣[1,2] 余良英[3] 曹明华[3] 冯佳燕[3] 林旭红[3] 冯雅静[3] 李永渝[3]
机构地区:[1]台州学院医学院,浙江台州318000 [2]台州学院附属市立医院,浙江台州318000 [3]同济大学医学院病理生理教研室,上海200092
出 处:《中国病理生理杂志》2011年第7期1409-1413,共5页Chinese Journal of Pathophysiology
基 金:国家自然科学基金资助项目(No.30971168)
摘 要:目的:通过观测早期术后肠麻痹小鼠肠系膜传入神经电活动的变化,探讨早期术后肠麻痹的发生机制。方法:C57BL/6小鼠通过经典小肠操作方法建立术后肠麻痹和假手术对照组的模型。术后3 h,进行离体细胞外多元肠系膜传入神经电活动的记录(n=6)。结果:术后肠麻痹时小鼠离体小肠收缩的振幅明显减少(P<0.05)。假手术对照组浆膜外给予5-羟色胺(5-HT)刺激,肠系膜传入神经电位活动明显高于术后肠麻痹组;在低压力扩张(肠腔压力为10-20 mmHg和20-30 mmHg)时,假手术对照组小肠传入神经放电明显高于术后肠麻痹组。结论:早期术后肠麻痹时肠道运动明显受抑,小肠肠系膜传入神经对刺激的反应性降低,后者可能参与早期术后肠麻痹的发生发展。AIM: To observe the changes of mesenteric afferent nerve discharge during the early phase of postoperative ileus(POI).METHODS: Under enflurane anesthesia,C57BL/6 mice underwent laparotomy followed by sham operation or standardized small bowel manipulation to induce POI.Three hours after operation,extracellular multi-unit mesenteric afferent nerve discharge was recorded(n=6 in each subgroup).RESULTS: Amplitudes of intestinal contractions were(0.67±0.03) mmHg after POI induction and(3.82±0.54) mmHg in sham group(P0.05).The intestinal afferent firing in response to serosal 5-hydroxytryptamine(5-HT) stimulation was followed by a decrease in the mesenteric afferent nerve discharge to(7.5±1.1) imp·s-1 in POI segments,compared with(20.5±5.5) imp·s-1 in sham group(P0.05).During intraluminal distension pressure from 10 to 20 mmHg and from 20 to 30 mmHg,the mesenteric afferent nerve discharges in POI segments were(30.8±6.6) imp·s-1 and(41.4±6.7) imp·s-1,respectively,lower than those in sham group [(40.6±5.5) imp·s-1 and(63.9±9.6) imp·s-1,respectively,P0.05].CONCLUSION: The mesenteric afferent nerve discharge in response to 5-HT and low-threshold distension is reduced in the early phase of POI.
关 键 词:手术后肠麻痹 肠系膜传入神经电活动
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