药动学模型的辨识问题研究

Study on Identification Problems of the Pharmacokinetic Models

目的:研究药动学房室模型的辨识问题。方法:采用Laplace变换方法对一次性给药的经典房室模型的辨识问题进行系统讨论。结果:一次性给药的经典房室模型一般不具有唯一性,存在房室模型的辨识问题。结论:在两种经典房室模型不可辨识的情况下,血药浓度与分布器官中药物浓度成正比,此时通过测定血药浓度来预测分布器官或靶器官中药物浓度是有理论根据和有意义的;反之,在两种经典房室模型可辨识的情况下,血药浓度与分布器官或靶器官中药物浓度不成比例关系,此时欲通过血药浓度监测来预测分布器官或靶器官中药物浓度,就需首先确定血药浓度与分布器官或靶器官中药物浓度之间的关系,否则是没有理论根据和无意义的。

OBJECTIVE:To study the identification problems of pharmacokinetic compartment models.METHODS:Problems of the identification of classical compartment models in single administration were systematically discussed by Laplace transformation method.RESULTS:The classical compartment models in single administration don't have the character of u-niqueness and the identification for which is a problem.CONCLUSION:The drug level in plasma and the concentration of drugs that distributed in organs were in a direct ratio under the condition of two kinds of unidentifiable classical compartment models,in that case,it has theoretic bases and significance to predict the concentration of drugs that distributed in organs or target organs by means of determining the drug concentration in plasma;if on the other hand,if two kinds of classical com-partment models are identifiable,the drug level in plasma and the concentration of drugs that distributed in organs or target organs wouldn't be in a proportional relationship,in this case,it is advisable to make sure the relationship between the drug le_ vel in plasma and the concentration of drugs that distributed in organs or target organs before predicting drug concentration that distributed in organs or target organs by means of monitoring the drug concentration in plasma;otherwise,it is baseless and meaningless.