该模型综合了生理药动学模型和房室模型的优点，并提出了血药浓度衰减的频率因子。
It has the advantage of physiological pharmacokinetics model, its kinetic parameters have anatomic and physiological meanings, and its solution can be expressed succinctly like the atrium model.
方法：通过查阅相关文献资料，深入分析老年人的生理功能变化，药动学、药效学特征。
Methods: analysis physiology functional change, pharmacokinetics and pharmacodynamics of aged people by finding and reading references.
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