Höfner K
Department of Urology, Hannover Medical School, Hannover, Germany.
Eur Urol. 1998;34 Suppl 1:38-9.
The information concerning bladder function during voiding and the size of the outlet resistance is found in relation to detrusor pressure and urinary flow (pressure flow plot). The lowest detrusor pressure during voiding (low-pressure flank) contains information on mechanical resistance (passive urethral resistance relation, PURR). The PURR curve is defined using foot point (cross-section with pressure axis) and slope. An increasing foot point as well as a decrease in the slope of the PURR curve indicate an increase in mechanical resistance. Optimally foot point and curvature must be classified separately as realized by the two-dimensional CHESS classification. The definition of PURR and its classification in CHESS are ideal procedures for a computer which simplifies the process.
排尿过程中膀胱功能以及出口阻力大小的相关信息可通过逼尿肌压力和尿流情况（压力-流率图）获取。排尿时最低的逼尿肌压力（低压段）包含了机械阻力的信息（被动尿道阻力关系，PURR）。PURR曲线是通过起点（与压力轴的交点）和斜率来定义的。PURR曲线起点上升以及斜率下降表明机械阻力增加。理想情况下，起点和曲率必须如二维CHESS分类那样分别进行分类。PURR的定义及其在CHESS中的分类对于计算机来说是理想的程序，简化了这一过程。
