Recent studies have been focusing on the impact of IAH in heart, lung ,kidney, gut etc. However, IAH-induced MODS still carries a high mortality rate up to 60% -70%. It's indicated in our previous study that the pressure of billary tract increases in IAH, which infers that the increase in biliary tract pressure may be significant in the development of IAH-induced MODS. Studies have shown that the inflammatory mediators were released with the elevation of billary tract pressure in acute cholangitis. External biliary drainage can improve organ function in hemorrhagic shock. TREM-1 pathway promotes the secretion of inflammatory mediators, triggers and expands systemic inflammation. Therefore, our hypothesis is "IAH→ biliary tract hypertension →TREM-1 pathway activated →excessive activation of inflammation →MODS". IAH+EBD animal model is introduced to prove our hypothesis from three aspects. First, influences of different intra-abdominal pressure on biliary tract pressure, sTREM-1 level in blood and bile, inflammatory response and organ function. Second, responses of sTREM-1 level, inflammatory response and organ function, when intra-abdominal pressure level keeps steady and biliary pressure level changes. Third, influences of blocking TREM-1 pathway on inflammatory response and organ function in IAH+ high bilitary tract pressure animal model. This topic is expected to inspire new ideas for the treatment of IAH-induced MODS.
腹腔高压导致MODS机制尚不十分明确,目前主要研究心、肺、肠道等病理生理改变,但病死率仍高达60%。我们前期研究发现IAH时胆道压力明显升高,提示胆道压力变化可能在IAH致MODS发生中起一定作用。研究表明,急性胆管炎胆道压力升高后胆汁中炎症介质升高;外引流胆汁可改善失血性休克所致脏器变化;TREM-1信号通路触发炎症介质过量释放。因此提出"IAH→胆道高压→TREM-1激活→炎症介质过量释放→MODS"设想,拟用腹腔高压+胆道置"T"管动物模型,探讨胆道压力变化在IAH导致MODS中的作用及可能机制:(1)不同腹腔压力对胆道压力,胆汁、血液中sTREM-1、炎症介质及重要脏器影响;(2)腹腔高压时不同胆道压力状态下胆汁、血液中sTREM-1、炎症介质及重要脏器改变;(3)胆道高压时阻断TREM-1信号通路对胆汁、血液中炎症介质及重要脏器影响。本研究拟为IAH导致MODS的救治提供新思路。
背景:腹腔高压导致MODS机制尚不十分明确,目前主要研究心、肺、肠道等病理生理改变,但病死率仍高达60%。我们前期研究发现IAH时胆道压力明显升高,提示胆道压力变化可能在IAH致MODS发生中起一定作用。.主要研究内容:第一部分:不同腹腔压力对胆道压力,胆汁、血液中sTREM-1、炎症介质及重要脏器的影响;第二部分:评估胆道外引流在改善腹腔高压导致的SIRS及MODS中的作用。.重要结果:随着腹腔压力的升高,胆道压力亦相应升高,胆汁及血清中的炎症介质浓度逐渐升高,器官功能损伤加重;胆道外引流可以改善腹腔高压导致的SIRS,在MODS的预防方面亦起到一定的作用。.关键数据:第一部分:在造模后第3、6、9小时,第2、第3组模型猪血清、胆汁中TNF-α、sTREM-1浓度均明显高于对照组同期浓度值,且有统计学意义(p ﹤0.05),同时,第3组的浓度值与第2组的同期值比较亦明显升高,且有统计学意义(p ﹤0.05);造模9小时后,第2、第3组模型猪肺、肾、肝、回肠的病理评分均高于对照组,第3组亦高于第2组,均有统计学意义(p ﹤0.05)。第二部分:在造模后第3、6、9小时,胆道有/无外引流组模型猪血清、胆汁中TNF-α、sTREM-1浓度均明显高于对照组同期浓度值,且有统计学意义(p ﹤0.05);同时,胆道外引流组胆汁中的TNF-α、sTREM-1浓度值明显低于胆道无外引流组,且有统计学意义(p ﹤0.05);在造模后第6、9小时,胆道外引流组血清中的TNF-α、sTREM-1浓度值明显低于胆道无外引流组,且有统计学意义(p ﹤0.05)造模9小时后,胆道有/无外引流组模型猪肺、肾、肝、回肠的病理评分均高于对照组,胆道外引流组的肝脏病理评分低于胆道无外引流组,有统计学意义(p ﹤0.05)。.科学意义:本研究进一步揭示和补充IAH导致MODS的发生机制,为临床上预防IAH时MODS的发生、救治IAH导致的MODS提供新思路,为IAH时经鼻胆管或胆囊穿刺引流胆道、降低胆道压力等治疗手段提供理论支持,从而提高IAH救治成功率。
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数据更新时间:2023-05-31
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