多潘立酮在增强结肠运动中的作用

Objective To observe the prokinetic effect of domperidone on colon and compare with that of mosapride and cisapride.Methods ① In viva experiment:forty rats were divided into control,domperidone,mosapride,and cisapride groups with 10 in each group.Stran gauges were planted both in proximal and distal colons and colonic motor activities were recoded in conscious rats.② In vitro experiment:the prokinetics effects of dopamine or dopamine combined with domperidone on the contraction of isolated rat colon strips were recorded by tone-transducers in the thermostatic muscle bath.Results In viva experiments:① in the interdigestive period of resting,activities of rhythimic phasic contraction were recoded in colon at conscious rats,and ② it had been showed that dornperidone significantly enhanced the contraction of colon in dose-dependent manner.Compared with control group,the mean contraction amplitude of proximal colon and distal colon increased by 84.61% ± 7.26% and 76.37 % ± 8.47% in domeridone group,respectively,which was higher than those in mosapride group (50.32%±8.16% and 45.13%±7.16%,respectively),but as same as those in cisapride group (92.55% ± 8.37% and 81.27% ± 9.95%,respectively).In vitro experiments:① perfusion of dopamin (40 mg/ml) could significantly decrease the contraction of isolated colon strip by 91.56% ± 10.24% in comparison with Krebs-Ringer solution,and ① domperidone could block the relaxant effect of dopamin on the isolated colon strip.Conclusions Domperidone can significantly enhance the colonic motor activities via antidopaminergic action.The effects of domperidone are similar as eisapride and greater than mosapride.     

多潘立酮增强胃运动作用的中枢机制

目的　多潘立酮 (Domperidone ,Domp)是一种抗呕吐的促胃肠动力药 ,其抗呕吐作用部位的延髓最后区 (Areapostrema ,AP)的促动力作用至今未见报导。本工作旨在研究多潘立酮对延髓最后区兴奋胃消化间期移行性复合运动 (MMC)的作用及其作用途径。方法　在清醒大鼠进行实验 ,在胃窦缝植应力传感器 ,通过电桥与自动平衡记录仪记录胃窦的MMC运动。AP注射部位根据脑定位图谱的AP位置埋藏不锈钢注射管 ,观察AP注入Domp对胃MMC运动的中枢作用。结果　 1 消化间期胃窦MMC运动 (n =10 )　胃窦MMC周期为 10 2 5± 1 32min ,其中Ⅰ相时程为 3…     

多潘立酮在增强结肠运动中的作用

Objective To observe the prokinetic effect of domperidone on colon and compare with that of mosapride and cisapride.Methods ① In viva experiment:forty rats were divided into control,domperidone,mosapride,and cisapride groups with 10 in each group.Stran gauges were planted both in proximal and distal colons and colonic motor activities were recoded in conscious rats.② In vitro experiment:the prokinetics effects of dopamine or dopamine combined with domperidone on the contraction of isolated rat colon strips were recorded by tone-transducers in the thermostatic muscle bath.Results In viva experiments:① in the interdigestive period of resting,activities of rhythimic phasic contraction were recoded in colon at conscious rats,and ② it had been showed that dornperidone significantly enhanced the contraction of colon in dose-dependent manner.Compared with control group,the mean contraction amplitude of proximal colon and distal colon increased by 84.61% ± 7.26% and 76.37 % ± 8.47% in domeridone group,respectively,which was higher than those in mosapride group (50.32%±8.16% and 45.13%±7.16%,respectively),but as same as those in cisapride group (92.55% ± 8.37% and 81.27% ± 9.95%,respectively).In vitro experiments:① perfusion of dopamin (40 mg/ml) could significantly decrease the contraction of isolated colon strip by 91.56% ± 10.24% in comparison with Krebs-Ringer solution,and ① domperidone could block the relaxant effect of dopamin on the isolated colon strip.Conclusions Domperidone can significantly enhance the colonic motor activities via antidopaminergic action.The effects of domperidone are similar as eisapride and greater than mosapride.     

延髓最后区对犬消化间期移行性复合运动的调节作用

目的　探讨延髓最后区对胃肠消化间期移行性复合运动（MMC）及血浆胃动素水平的影响.方法　在8只犬的胃窦和十二指肠浆膜埋植应力传感器记录胃窦和十二指肠消化间期复合运动.在一侧股静脉内置慢性静脉插管供注射外源性胃动素.用RIA法测定血浆胃动素含量.观察：（1）消化间期正常MMC活动和血浆胃动素浓度变化；（2）电损毁延髓最后区对MMC活动和血浆胃动素水平的影响；（3）电损毁延髓最后区对外源性胃动素启动MMC Ⅲ相收缩作用的影响.结果　（1）正常犬消化间期出现典型的Ⅰ、Ⅱ、Ⅲ、Ⅳ相MMC.MMC Ⅲ相与血浆胃动素释放高峰同步发生.（2）电损毁延髓最后区后, 胃窦和十二指肠MMC的收缩运动明显抑制,MMC Ⅰ相延长,Ⅱ、Ⅲ相明显缩短,失去了损毁前MMC周期性﹑时相性和移行性的特点,血浆胃动素浓度明显降低,外源性静脉注射胃动素不能启动MMC Ⅲ相收缩.结论　延髓最后区对消化间期 MMC的周期发生和移行有重要的调控作用,其作用途径与胃动素介导有关.     

Role of the area postrema of medulla oblongata in the regulation of canine int erdigestive migrating motor complex

Objective To determine the effect of the area postrema (AP) of the medulla oblongata on gastrointestinal interdigestive migrating motor complex (MMC) and the plasma motil in level. Methods Interdigestive MMC activities of the antrum and duodenum were recorded by strain gauge implanted on the serosa of 8 conscious dogs.A cannula was intubated in femoral vein for motilin injection.The plasma motilin concentration was measur edby RIA.We observed: (1) normal interdigestive MMC activity and fluctuatio ns in plasma motilin concentration; (2) the effects of electrically damaging the AP on MMC activity and plasma motilin level; (3) whether intravenous injection of motilin could induce phase Ⅲ contractions after the AP was destroyed.Results (1) Typical interdigestive MMC with phase Ⅰ, Ⅱ, Ⅲ, and Ⅳ was recorded in nor mal dogs.Phase Ⅲ was concurrent with the peak of plasma motilin level.(2) I n damaged AP dogs, antroduodenal interdigestive MMC contractions were suppressed ; cyclic, phasic and migratory pattern of MMC was disrupted.Plasma motilin con centration was decreased.Intravenous injection of motilin could not induce pha se Ⅲ contractions. Conclusions The area postrema might play an important role, which is mediated by motilin, on the regulation of interdigestive MMC.     

多潘立酮在增强结肠运动中的作用

Objective To observe the prokinetic effect of domperidone on colon and compare with that of mosapride and cisapride.Methods ① In viva experiment:forty rats were divided into control,domperidone,mosapride,and cisapride groups with 10 in each group.Stran gauges were planted both in proximal and distal colons and colonic motor activities were recoded in conscious rats.② In vitro experiment:the prokinetics effects of dopamine or dopamine combined with domperidone on the contraction of isolated rat colon strips were recorded by tone-transducers in the thermostatic muscle bath.Results In viva experiments:① in the interdigestive period of resting,activities of rhythimic phasic contraction were recoded in colon at conscious rats,and ② it had been showed that dornperidone significantly enhanced the contraction of colon in dose-dependent manner.Compared with control group,the mean contraction amplitude of proximal colon and distal colon increased by 84.61% ± 7.26% and 76.37 % ± 8.47% in domeridone group,respectively,which was higher than those in mosapride group (50.32%±8.16% and 45.13%±7.16%,respectively),but as same as those in cisapride group (92.55% ± 8.37% and 81.27% ± 9.95%,respectively).In vitro experiments:① perfusion of dopamin (40 mg/ml) could significantly decrease the contraction of isolated colon strip by 91.56% ± 10.24% in comparison with Krebs-Ringer solution,and ① domperidone could block the relaxant effect of dopamin on the isolated colon strip.Conclusions Domperidone can significantly enhance the colonic motor activities via antidopaminergic action.The effects of domperidone are similar as eisapride and greater than mosapride.     

多潘立酮在增强结肠运动中的作用

Objective To observe the prokinetic effect of domperidone on colon and compare with that of mosapride and cisapride.Methods ① In viva experiment:forty rats were divided into control,domperidone,mosapride,and cisapride groups with 10 in each group.Stran gauges were planted both in proximal and distal colons and colonic motor activities were recoded in conscious rats.② In vitro experiment:the prokinetics effects of dopamine or dopamine combined with domperidone on the contraction of isolated rat colon strips were recorded by tone-transducers in the thermostatic muscle bath.Results In viva experiments:① in the interdigestive period of resting,activities of rhythimic phasic contraction were recoded in colon at conscious rats,and ② it had been showed that dornperidone significantly enhanced the contraction of colon in dose-dependent manner.Compared with control group,the mean contraction amplitude of proximal colon and distal colon increased by 84.61% ± 7.26% and 76.37 % ± 8.47% in domeridone group,respectively,which was higher than those in mosapride group (50.32%±8.16% and 45.13%±7.16%,respectively),but as same as those in cisapride group (92.55% ± 8.37% and 81.27% ± 9.95%,respectively).In vitro experiments:① perfusion of dopamin (40 mg/ml) could significantly decrease the contraction of isolated colon strip by 91.56% ± 10.24% in comparison with Krebs-Ringer solution,and ① domperidone could block the relaxant effect of dopamin on the isolated colon strip.Conclusions Domperidone can significantly enhance the colonic motor activities via antidopaminergic action.The effects of domperidone are similar as eisapride and greater than mosapride.     

多潘立酮在增强食管和下食管括约肌运动的作用

目的 观察多潘立酮对食管和下食管括约肌(LES)的促动力作用,并与莫沙必利及西沙必利比较.方法 在体实验:将40只大鼠分为对照组、多潘立酮组、莫沙必利组和西沙必利组.在各组大鼠近端食管体、远端食管体和LES埋植应力传感器,记录清醒大鼠食管体和LES运动.离体实验:在恒温灌流肌槽中,采用张力传感器测定多潘立酮、莫沙必利、西沙必利对大鼠离体食管体及LES肌条的收缩活动.结果 在体实验:①清醒大鼠在消化间期的静息状态下,食管体呈现轻微的收缩运动.LES则出现典型的消化间期移行性复合运动(MMC)Ⅰ、Ⅱ、Ⅲ、Ⅳ相,其收缩强度大于食管体.②多潘立酮可明显增加食管体及LES的收缩运动.使近端食管体与远端食管体及LES平均振幅分别比对照组增加63.24%±7.17%,75.54%±5.27%和85.81%±6.02%,并呈剂量-效应关系.同等剂量的莫沙必利对近端食管体和远端食管体及LES平均振幅分别比对照组增加29.71%±4.15%,40.15%±3.30%和35.24%±5.36%.莫沙必利对食管和LES的促动力作用大大低于多潘立酮.而同等剂量的西沙必利对近端食管体和远端食管体及LES平均振幅分别比对照组增加59.84%±6.55%,70.11%±5.62%,75.13%±5.10%,其促动力作用与多潘立酮相同.离体实验:①灌流多潘立酮可明显刺激离体食管体肌条和LES肌条收缩,分别较Krebs-Ringer液对照组增加87.74%±7.65%和92.44%±7.17%.同等剂量的莫沙必利平均振幅分别较对照组Kreha-Ringer液增加35.42%±5.02%和31.12%±4.32%.莫沙必利的促动力作用大大低于多潘立酮.而同等剂量的西沙必利对离体食管和LES促动力作用与多潘立酮相同.②阿托品与河豚毒素均可阻断多潘立酮刺激食管及LES的动力作用.结论 多潘立酮可明显刺激食管体收缩及明显增强LES动力,上述作用均明显优于莫沙必利并与西沙必利作用相同.多潘立酮增强食管与LES动力的作用机制,除已知阻断多巴胺受体外,还可能通过肠神经系统内胆碱能神经介导.     

2.28多潘立酮增强胃运动作用的中枢机制

目的多潘立酮(Domperidone,Domp)是一种抗呕吐的促胃肠动力药,其抗呕吐作用部位的延髓最后区(Area postrema,AP)的促动力作用至今未见报导.本工作旨在研究多潘立酮对延髓最后区兴奋胃消化间期移行性复合运动(MMC)的作用及其作用途径.     

肠内营养在疾病治疗中的作用

肠内营养(Enteral nutrition,EN)是指经鼻饲管将营养物质直接送到小肠,起到维持那些因不同原因长期无法进食的患者的生命,改善其全身情况的作用。早在1860年南丁格尔根据自己长期临床护理实践就告诫临床医生要重视患者的营养,成为临床营养的雏形。1967 Dudrick,Vars和Wilmore等创用全肠外营养,并证实了全肠外营养(TPN)的有效性。