title: [Diagnostic value of urodynamic parameters multianalysis in the evaluation of bladder outlet obstruction resulting from benign prostatic hyperplasia].
abstract: OBJECTIVE
  To construct a function model that can be used in the diagnosis bladder outlet obstruction (BOO) resulting from benign prostatic hyperplasia, and to develop a diagram allowing the judgement of bladder outlet for patients with different detrusor contractility, especially with impaired one.
  
  
  METHODS
  Urodynamic and clinical data of 131 men were analyzed retrospectively. By Logistic analysis, a function model was constructed. Based on the model, a diagram allowing the evaluation of bladder outlet was drawn. The cutoff point for diagnosing BOO with the function model and the curve was confirmed by ROC curve analysis.
  
  
  RESULTS
  The function model (BOOI) was obtained by the formula 5.03 x residual fraction + 0.04 x PdetatQmax - 0.20 x Qmax - 0.91 + alpha (alpha = 0 for those with low pressure-low flow on P-FS, alpha = 1.42 for high pressure-low flow, alpha = -7.30 for high pressure-high flow). The cutoff point for BOOI diagnosing BOO was 0.36. When validated, the sensitivity, specificity, positive predictive value, and negative predictive value were 85.7%, 91.7%, 96.0% and 73.3% respectively.
  
  
  CONCLUSIONS
  The BOOI, with an easy calculation mode, could predict the probability of BOO. The sensitivity and specificity of the criterion for the diagnosis of BOO were satisfactory. The curve we drew could help to differentiate the obstructed men with low pressure-low flow and thus benefit them by surgical relief of their obstruction.
authors.affiliation: Department of Urology , the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510080, China.
authors.forename: Yue-you
authors.initials: YY
authors.lastname: Liang
authors.forename: Ming-xin
authors.initials: MX
authors.lastname: Cao
authors.forename: Yu-ping
authors.initials: YP
authors.lastname: Dai
authors.forename: Wei-jie
authors.initials: WJ
authors.lastname: Liang
authors.forename: Ke-li
authors.initials: KL
authors.lastname: Zheng
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D011470:Prostatic Hyperplasia / Q000150:complications*; D012372:ROC Curve; D012189:Retrospective Studies; D001748:Urinary Bladder Neck Obstruction / Q000175:diagnosis* / Q000209:etiology; D014563:Urodynamics