Impact of 8F intra-urethral catheter on uroflow rate in pressure-flow studies in patients with benign prostatic hyperplasia

Abstract

Objective To investigate the impact of 8F intra-urethral catheter on uroflow rate in pressureflow studies in patients with benign prostatic hyperplasia.Methods one hundred and three men with lower urinary tract symptoms underwent free uroflometry and pressure-flow study respectively.With an 8F urethral catheter,we recorded the standard pressure-flow variables such as umflometry,detrusor pressure at maximum uroflow and so on.We analyze,free uroflow rate and catheter's uroflow rate with paired t-test.Results The maximum voided volume in free uroflometry and in pressure-flow study were (177.68±70.55)ml and (180.90±68.34)ml respectively.The maximum free uroflow rate and the maximum catheter's uroflow rate were (10.2±3.1)ml/s and (7.8±3.9 )ml/s in BPH with detrusor normal-activity group ( P＜0.05 ),(9.1±4.1)ml/s and (5.8±3.2)ml/s in BPH with detrusor under-activity group(P＜0.05 ).The differences of uroflometry between two voids in tow groups were (2.9±2.8)ml/s and (3.4±2.9)ml/s( P＜0.05 ).Paired t-test showed that there was significant difference between the maximum free uroflow rate and maximum catheter's uroflow rate.Conclusions 8F urethral catheter appeared to have a significant impact on maximum umflow rate in benign prostatic hyperplasia and there was more significant impact in BPH with detrusor under-activity group.It must be considered when analyzing pressure flow parameters to make a accurate diagnosis. Key words: Urodynamics; Pressure-flow study transurethral; Catheterization; Uroflometry