代谢
顺阿曲库铵的降解在很大程度上独立于肝脏代谢。顺阿曲库铵通过霍夫曼消除(一个依赖于pH和温度的化学反应)形成劳丹烷碱和单季铵盐丙烯酸代谢物。非特异性血浆酯酶将单季铵盐丙烯酸代谢物水解为单季铵盐醇代谢物(MQA)。MQA也可以通过霍夫曼消除,但这个过程的速度比检测到的顺阿曲库铵的速度慢。劳丹烷碱进一步代谢为去甲基代谢物,与葡萄糖醛酸结合并在尿液中排出。劳丹烷碱在给予几种动物时可能导致短暂的低血压,在较高剂量时可能导致大脑兴奋作用;然而,劳丹烷碱在人体中的效果尚未确定。
The degradation of cisatracurium is largely independent of liver metabolism. Cisatracurium undergoes Hofmann elimination (a pH and temperature-dependent chemical process) to form laudanosine and the monoquaternary acrylate metabolite. Non-specific plasma esterases hydrolyze the monoquaternary acrylate metabolite to form the monoquaternary alcohol metabolite (MQA). The MQA can also undergo Hofmann elimination, but the rate of this process is slower than the one detected for cisatracurium. Laudanosine is further metabolized to desmethyl metabolites that are conjugated with glucuronic acid and excreted in the urine. Laudanosine may cause transient hypotension and, in higher doses, cerebral excitatory effects when administered to several animal species; however, the effects of laudanosine in humans have not been established.
来源:DrugBank