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1·AIM:To determinate the median effective dose(IED50) of rocuronium via tracheal intubation in different ages male patients by sequential experimental method, and study the effect of the age to IED50.

目的：通过序贯实验法测定不同年龄男性患者罗库溴铵气管插管的半数有效剂量（IED50），并探讨年龄因素对IED50的影响。