目的 :通过比较自由排尿和经尿道尿管压力 流率测定的尿流参数 ,探讨尿管对尿流测定的影响。方法 :47例泌尿系症状患者 ,第 1组为 1 1例能在自由排尿时排尿而在压力 流率测定时不能排尿的患者 ,第 2组为 36例2次检查皆可排尿的患者 (包括 5例小儿患者 )。每个患者都进行了自由排尿 (无尿管 )和压力 流率测定 (有尿管 ) 2次检查。然后比较 2次检查的最大尿流率 (Qmax)、平均尿流率 (Qave)、残余尿 (PVR)、排出尿量 (VV)和达最大尿流时间 (Tmax)。结果 :1 1例成人 (2 3 % )患者带尿管时不能排尿。 31例 (66 % )成人患者 2次检查皆可排尿 ,2次尿流参数比较显示Qmax、Qave、Tmax和PVR差异有统计学意义 (P <0 .0 5)。VV差异无统计学意义 (P >0 .0 5)。在 5例小儿中 2次检查的 5项参数差异均无统计学意义 (P >0 .0 5)。结论 :在成年人尿管对尿流Qmax、Qave和PVF测定结果有影响。在小儿尿管对尿流测定影响较小。因此 ,对于成年人为了排除尿管对尿流测定的影响在进行压力 流率测定前应常规进行自由排尿测定各项尿流参数 OBJECTIVE: To compare the urinary flow parameters measured by free urination and transurethral urinary pressure flow to investigate the effect of catheter on urinary flow. METHODS: Forty-seven patients with urologic symptoms were enrolled. Group 1 consisted of 11 patients who were able to urinate during free urination and not able to urinate at the time of pressure-flow measurement. Group 2 consisted of 36 patients with two examinations urinating (including 5 pediatric patients). Each patient underwent free voiding (no catheter) and pressure flow rate (with catheter) 2 tests. The maximal Qmax, Qave, residual urine (PVR), excreted urine (VV), and maximal urinary flow (Tmax) were then compared between the 2 exams. Results: 1 1 adult (23%) patients with urinary catheter can not urinate. Twenty-one patients (66%) had urination during 2 examinations. The comparison of 2 urinary flow parameters showed that there were significant differences in Qmax, Qave, Tmax and PVR (P <0.05). VV difference was not statistically significant (P> 0.05). There was no significant difference in the five parameters of the two examinations among the five children (P> 0.05). CONCLUSIONS: Adult urinary catheters have effects on Qmax, Qave and PVF measurements of urinary flow. Urinary flow in children less impact on the determination of urine. Therefore, in order to rule out the impact of urinary catheter on urinary flow in adults, free urination should be routinely performed before pressure flow rate measurement. Urine flow parameters