title: [Residual fraction in the evaluation of bladder outlet obstruction resulting from benign prostatic hyperplasia].
abstract: OBJECTIVE
  To study residual fraction (RF) in the bladder outlet obstruction (BOO) resulting from benign prostatic hyperplasia (BPH).
  
  
  METHODS
  Fifty adult outpatients with BPH were evaluated. With ultrasound and uroflowmetry, prevoid volume (PV) and postvoid residual volume (PRV) and peak flow rate (Qmax) were determined. Linear dependence analysis of RF and Qmax, PRV and Qmax were conducted.
  
  
  RESULTS
  The coefficient between RF and Qmax showed extremely negative correlation(r = -0.3859, P < 0.01). Also, PRV and Qmax showed significant negative correlation (r = -0.2831, P < 0.05).
  
  
  CONCLUSIONS
  The greater the RF, the more serious the BOO, the poorer potency of bladder. It is recommended that RF be used as a good supplement to PVR in the routine non-invasive evaluation of BOO caused by BPH.
authors.affiliation: Department of Urology, Nanjing General Hospital, Nanjing Command, Nanjing, Jiangsu 210002, China.
authors.forename: Wen
authors.initials: W
authors.lastname: Cheng
authors.forename: Jian-Ping
authors.initials: JP
authors.lastname: Gao
authors.forename: Zheng-Yu
authors.initials: ZY
authors.lastname: Zhang
authors.forename: Jing-Ping
authors.initials: JP
authors.lastname: Ge
authors.forename: Song
authors.initials: S
authors.lastname: Xue
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011470:Prostatic Hyperplasia / Q000150:complications / Q000503:physiopathology*; D014463:Ultrasonography; D001748:Urinary Bladder Neck Obstruction / Q000000981:diagnostic imaging / Q000209:etiology / Q000503:physiopathology*; D014563:Urodynamics