title: [Effects of transurethral catheterization on uroflow rate in the pressure-flow study of patients with benign prostatic hyperplasia].
abstract: OBJECTIVE
  To investigate the effects of transurethral catheterization on the uroflow rate in the pressure-flow study of patients with benign prostatic hyperplasia (BPH).
  
  
  METHODS
  Thirty-nine men with BPH underwent free uroflowmetry and pressure-flow analysis respectively. With an 8 F urethral catheter, the standard pressure-flow variables such as the maximum flow rate, detrusor pressure at the maximum flow rate and so on were recorded. The free maximum flow rate and the maximum flow rate with transurethral catheterization were statistically analyzed.
  
  
  RESULTS
  The maximum voided volumes of the free uroflowmetry group and the pressure-flow study group were (209.23 +/- 56. 56) ml and (210.33 +/- 62.02) ml respectively (P > 0.05). The free maximum flow rate was (8.61 +/- 2.80) ml/s, and the maximum flow rate with transurethral catheterization-was (7.39 +/- 3.01) ml/s (P < 0.05). When the patients were divided into seven grades of bladder outlet obstruction (BOO) according to the Schäfer nomogram, the free maximum flow rate and the maximum flow rate with transurethral catheterization with Grade 0-I of BOO were (12.56 +/- 1.57) ml/s and (10.95 +/- 2.51) ml/s, and those of Grade II were (9.35 +/- 0.76) ml/s and (8.41 +/- 1.23) ml/s respectively. For Grades III, IV and V-VI , the two maximum flow rates were (7.88 +/- 1.21) ml/s and (6.37 +/- 0.59) ml/s, (6.54 +/- 1.93) ml/s and (5.55 +/- 2.48) ml/s, and (6.01 +/- 2.10) ml/s and (4.84 +/- 2.89) ml/s, respectively, all with significant difference in between (P < 0.05).
  
  
  CONCLUSIONS
  The 8 F urethral catheter has a significant effect on the maximum uroflow rate in the pressure-flow study and this effect is correlated with the grade of BOO.
authors.affiliation: Department of Urology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, China. zhaoshanechao@263.net
authors.forename: Shan-Chao
authors.initials: SC
authors.lastname: Zhao
authors.forename: Shao-Bin
authors.initials: SB
authors.lastname: Zheng
authors.forename: Wan-long
authors.initials: WL
authors.lastname: Tan
authors.forename: Xiang-ming
authors.initials: XM
authors.lastname: Mao
authors.forename: Peng
authors.initials: P
authors.lastname: Zhang
authors.forename: Zhao-ming
authors.initials: ZM
authors.lastname: Huang
authors.forename: Hui-jian
authors.initials: HJ
authors.lastname: Zhang
authors.forename: Yi
authors.initials: Y
authors.lastname: Zuo
mesh_terms: D000368:Aged; D006801:Humans; D008297:Male; D008875:Middle Aged; D011470:Prostatic Hyperplasia / Q000503:physiopathology* / Q000628:therapy*; D016896:Treatment Outcome; D001748:Urinary Bladder Neck Obstruction / Q000503:physiopathology / Q000628:therapy; D014546:Urinary Catheterization / Q000379:methods*; D014554:Urination; D014563:Urodynamics