首页> 外文期刊>Journal of pharmacokinetics and biopharmaceutics >Estimating potency for the Emax-model without attaining maximal effects.
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Estimating potency for the Emax-model without attaining maximal effects.

机译:估计Emax模型的效能而未获得最大效果。

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摘要

The most widely applied model relating drug concentrations to effects is the Emax model. In practice, concentration-effect relationships often deviate from a simple linear relationship but without reaching a clear maximum because a further increase in concentration might be associated with unacceptable or distorting side effects. The parameters for the Emax model can only be estimated with reasonable precision if the curve shows sign of reaching a maximum, otherwise both EC50 and Emax estimates may be extremely imprecise. This paper provides a solution by introducing a new parameter (S0) equal to Emax/EC50 that can be used to characterize potency adequately even if there are no signs of a clear maximum. Simulations are presented to investigate the nature of the new parameter and published examples are used as illustration.
机译:将药物浓度与作用相关的应用最广泛的模型是Emax模型。在实践中,浓度-效应关系通常偏离简单的线性关系,但没有达到明显的最大值,因为浓度的进一步增加可能会带来不可接受的或扭曲的副作用。如果曲线显示出达到最大值的迹象,则只能以合理的精度估算Emax模型的参数,否则EC50和Emax估算值可能都非常不准确。本文通过引入一个等于Emax / EC50的新参数(S0)提供了一种解决方案,即使没有明显的最大值迹象,该参数也可以用来充分表征效能。进行仿真以研究新参数的性质,并使用已发布的示例进行说明。

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