This paper gives a survey of urodynamic data that may be used for evaluating functional aspects of the bladder and its excretory tract. The different parameters are physically defined. Units of the International System are used in the dimensional formulae, which facilitates the establishment of relations between these parameters. The so-called urethral drag can be derived from the pressure law of Blasius. The calculation is as follows: urethral drag = vesical pressure/(maximum urethral discharge). This value is proportional to the true vesical resistance in a physical sense.
本文综述了可用于评估膀胱及其排泄道功能方面的尿动力学数据。对不同参数进行了物理定义。在量纲公式中使用国际单位制单位，这便于建立这些参数之间的关系。所谓的尿道阻力可根据布拉修斯压力定律推导得出。计算方法如下：尿道阻力 = 膀胱压力/（最大尿道排出量）。从物理意义上讲，该值与实际膀胱阻力成正比。
