异丙酚、芬太尼、安定及非去极化肌松药配伍应用于全麻诱导在临床上已逐渐得到推广 ,但在诱导期间常出现较为明显的低血压和心动过缓等血流动力学的变化 ,虽然持续时间可能较短 ,对有潜在心脑血管疾患及循环代偿不良的患者仍可能有不良后果。本文探讨应用小剂量麻黄碱预防全麻 Propofol, fentanyl, stability and non-depolarizing muscle relaxants compatibility in general anesthesia induction has been gradually promoted, but during induction often more obvious hypotension and bradycardia and other hemodynamic Changes in learning, although the duration may be short, may still have adverse consequences for patients with underlying cardiovascular and circulatory disorders. This article discusses the application of small doses of ephedrine to prevent general anesthesia