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1、氨在肝性腦病發(fā)病機(jī)制中的作用知識(shí)回顧概念臨床表現(xiàn)氨中毒學(xué)說(shuō)一、目的二、藥品器材動(dòng)物三、方法步驟四、結(jié)果五、討論分析六、結(jié)論操作步驟固定、局麻上腹部正中切口,開(kāi)腹剪鐮狀韌帶辯明肝葉、肝葉結(jié)扎12指腸荷包縫合并插管腹壁全層連續(xù)縫合,關(guān)腹腔觀察輸液(60滴/分)動(dòng)物大抽搐時(shí),記錄時(shí)間用量動(dòng)物死亡時(shí),記錄時(shí)間用量局麻鐮狀韌帶肝臟各葉結(jié)扎肝葉荷包縫合十二指腸插管腹壁全層連續(xù)縫合大抽搐,腳弓反張,肌肉強(qiáng)直實(shí)驗(yàn)分組如下:甲組:肝葉結(jié)扎+滴注氯化銨乙組:肝葉不結(jié)扎+滴注氯化銨丙組:肝葉結(jié)扎+滴注氯化鈉丁組:肝葉結(jié)扎+耳緣推注谷氨酸鈉溶液20ml/kg
2、+滴注氯化銨結(jié)果抽搐死亡時(shí)間用量(ml/kg)時(shí)間用量(ml/kg)甲1225.62446.6乙2235.73540.7丙丁16/1829.4/26.82552.9注意比較丙組與甲組;甲組與乙組;丁組與甲組注意事項(xiàng)剪鐮狀韌帶時(shí)勿傷及膈肌和血管肝葉扎緊12指腸插管的方向各組液體滴速盡量保持一致(60滴/分)NH4+NH3H+OH-LiverKrebs-HeneseleitureaBBBBrain1.Impairmentofenergymetabolism2.AlterationofneurotransmittersfunctionImp
3、airedPortosystemicshunting[NH3]↑production↑(fromsmallintestine)clearance↓(liverinsufficiency/dysfunction)Whatreasonscausethebloodammoniaelevated?ornithinecitrullineargininearginaseureaKrebs-HeneseleitureacycleTherewouldbeproduced1ureamoleculeanduseup3NH3moleculeseveryon
4、ecircle.pH=7.4,99%1%[NH3]<59umol/LpH>7.45,[NH3]↑H+OH-NH4+NH3Easytobeabsorbed,andpassthroughintoBBBHavetoxiceffectonbraincellDifficultytobeabsorbed,andgoacrossintoBBBHavenotoxiceffectonbraincellWhichisthetoxictobraincell?NH4+NH3H+OH-GlutamineBBBBrain+MSGNH3Glutamine,akin
5、dofbiogenicamine,can’tpassthroughBBB,onlyinperipheralblood,ratherthancerebrospinalfluid.結(jié)論