Reynard J M, Lim C, Swami S, Abrams P
Bristol Urological Institute, Southmead Hospital, United Kingdom.
J Urol. 1996 Mar;155(3):901-3.
The effect of a urethral catheter on pressure-flow relationships of the urethra has important implications for the practice to this question in the past in men with benign prostatic hyperplasia. We assessed the obstructive effect of an 8 Ch. urethral catheter in men who presented with lower urinary tract symptoms due to benign prostatic hyperplasia.
During combined pressure-flow studies 59 men completed 2 voids of similar volume with and without a urethral catheter in situ. Maximum flow rate, detrusor pressure at maximum flow and the group of specific urethral resistance factor were measured and compared between these 2 voids.
There was no significant difference in maximum flow rate between voids (with catheter 9.1 ml. per second versus without catheter 8.6 ml. per second). Although detrusor pressure was significantly greater with the urethral catheter in situ (80 versus 67 cm. water), voids (with catheter 42.1 cm, water versus without catheter 36.6 cm water).
A 8 Ch. catheter does not appear to have a significant obstructive effect in the urethra. This finding has important implications for the practice and interpretation of pressure-flow studies.
尿道导管对尿道压力-流量关系的影响对良性前列腺增生男性患者这一问题的临床实践具有重要意义。过去对此问题的研究较少。我们评估了8号尿道导管对因良性前列腺增生出现下尿路症状男性患者的梗阻作用。
在联合压力-流量研究中，59名男性在尿道导管在位和不在位的情况下分别完成了2次相似尿量的排尿。测量并比较了这2次排尿的最大尿流率、最大尿流时逼尿肌压力以及特定尿道阻力因子组。
排尿间最大尿流率无显著差异（导管在位时为每秒9.1毫升，导管不在位时为每秒8.6毫升）。尽管尿道导管在位时逼尿肌压力显著更高（80厘米水柱对67厘米水柱），排尿时（导管在位时为42.1厘米水柱，导管不在位时为36.6厘米水柱）。
8号导管似乎对尿道没有显著的梗阻作用。这一发现对压力-流量研究的实践和解读具有重要意义。
