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阳羊yyy

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[求助] 请问Cmax/AUC这个参数有什么作用已有1人参与

请教各位:Cmax/AUC这个参数有什么作用?可以用来衡量药物吸收率吗?为什么?谢谢各位了
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chem_sq

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感谢参与,应助指数 +1
karl2100: 金币+1, 谢谢! 2013-05-03 23:27:39
Cmax:血药达峰浓度
AUC:血液浓度的曲线下面积

两个数值基本可以反应药代动力学中的吸收情况。你说的吸收率是指生物利用度吧,这还要看药物的代谢和排泄情况
2楼2013-05-03 11:08:19
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阳羊yyy

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引用回帖:
2楼: Originally posted by chem_sq at 2013-05-03 11:08:19
Cmax:血药达峰浓度
AUC:血液浓度的曲线下面积

两个数值基本可以反应药代动力学中的吸收情况。你说的吸收率是指生物利用度吧,这还要看药物的代谢和排泄情况

我说的是Cmax/AUC的比值有什么作用哦
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3楼2013-05-03 16:28:08
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星星的眼睛

铁杆木虫 (著名写手)

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感谢参与,应助指数 +1
引用回帖:
3楼: Originally posted by 阳羊yyy at 2013-05-03 16:28:08
我说的是Cmax/AUC的比值有什么作用哦...

这个还真没见有人用过,没什么作用,不过非要扯上点作用,可能跟吸收消除有关;该比值越高,吸收或者消除越快
4楼2013-05-04 22:13:53
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zhoupeng87

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这个比值怎么衡量药物吸收率呢
5楼2013-05-06 10:06:25
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zhangxuan200

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Endrenyi and co-workers (1991, 1993) were the first to show that Cmax/AUC is a
better characteristic of the absorption rate than Cmax itself. They showed that the ratio
Cmax/AUC is independent of both within-subject variations and possible differences in
the extent of absorption and – in the case of a one-compartment body model with firstorder
absorption – reflects only the contrast between the absorption and disposition rate
constants, ka/kel. Lacey et al. (1994) considered simulated and real experiments and came
up with the conclusion that Cmax/AUC is a more powerful metric than Cmax in establishing
bioequivalence when formulations are truly bioequivalent, and that Cmax/AUC is more
sensitive than Cmax at detecting differences in rate of absorption when they exist. Schall
and co-workers (1994) showed that under fairly general conditions tmax and Cmax/AUC
are equivalent characteristics of the absorption rate. Cmax/AUC can be observed with
higher precision, and is easier to handle statistically than tmax. On the basis of data from
20 bioequivalence studies they came up with the rather subtle recommendation that for
drugs with short (<5 hours) elimination half-lives or fastest disposition half-lives in the
case of higher compartmental models, Cmax/AUC is the best rate characteristic, but that
for drugs with long elimination or fastest disposition half-lives, tmax can be superior to
Cmax/AUC.
6楼2013-05-14 08:48:19
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匿名

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群体药物动力学专业技术人员

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