某一单室模型药物的消除速度常数为0.3465h-1,分布容积为5L,静脉注射给药200mg,经过2小时后,体内血药浓度是A:40μ/mlB:30μg/...

作者: rantiku 人气: - 评论: 0
问题 某一单室模型药物的消除速度常数为0.3465h-1,分布容积为5L,静脉注射给药200mg,经过2小时后,体内血药浓度是
选项 A:40μ/ml B:30μg/ml C:20μg/ml D:15μg/ml E:10μg/ml
答案 C
解析 本题主要考查静脉注射血药动力学方程的计算。静脉注射给药,注射剂量即为X0,本题X0=200mg,V=5L。初始血药浓度即静脉注射的瞬间血药浓度,用C0表示。C0=X0/V=200mg/5L=40mg/L=40μg/ml。根据公式lgC=(-K/2.303)t+lgC0得lgC=(-0.3465/2.303)*2+lg40=1.30C=20μg/ml故本题答案应选择C。
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