A new index of voiding dysfunction in men with benign prostatic hyperplasia undergoing transurethral resection of the prostate adds superior information to the traditional maximum flow rate (Qmax)

Francoise A. Valentini, Alienor Gilchrist, Pierre P. Nelson, Philippe E. Zimmern

Research output: Contribution to journalArticle

3 Scopus citations


Introduction: To compare Qmax and a new index of voiding dysfunction (D) obtained from free flow (FF) and intubated flow (IF) in men before and after trans-urethral resection of prostate (TURP). Material and Methods: Preoperative FF and IF of benign prostatic hyperplasia patients with bladder outlet obstruction were studied for Qmax and D, and compared to a series of post-TURP FF in the same patients obtained at interval follow-ups. Analysis was done in a blinded fashion. D was computed with the VBN® software. Results: From 24 fully studied patients, preoperative D values were similar (p = 0.61) for FF (25.6 ± 7.4) and IF (26.8 ± 7.1). Postoperatively, D values (9.6 ± 8.6) dropped (p = 0.001) and were more stable than Qmax. Range dispersion between D and Qmax for two successive FF postoperatively in a same patient was 4 times larger for Qmax over D. Conclusion: D values from FF or IF were similar preoperatively but markedly reduced after TURP. This more stable index compared to Qmax may offer an alternative approach to gauge the voiding performance of a symptomatic patient with benign prostatic hyperplasia and bladder outlet obstruction.

Original languageEnglish (US)
Pages (from-to)151-157
Number of pages7
JournalCurrent Urology
Issue number3
StatePublished - Nov 1 2011



  • Benign prostatic hyperplasia
  • Bladder outlet obstruction
  • Free uroflow
  • Transurethral resection of prostate
  • Voiding dysfunction index

ASJC Scopus subject areas

  • Reproductive Medicine
  • Oncology
  • Urology

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