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Related Experiment Videos

Maximum urinary flow rate by uroflowmetry: automatic or visual interpretation

P B Grino1, R Bruskewitz, J G Blaivas

  • 1Merck Sharp & Dohme Research Laboratories, Rahway, New Jersey.

The Journal of Urology
|February 1, 1993
PubMed
Summary
This summary is machine-generated.

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Manual reading of maximum urinary flow rate measurements in uroflowmetry significantly reduces variability caused by artifacts. This improves statistical power for studies evaluating treatments like finasteride for benign prostatic hyperplasia.

Area of Science:

  • Urology
  • Medical Technology

Background:

  • Benign prostatic hyperplasia (BPH) is a common condition affecting older men.
  • Uroflowmetry is a key diagnostic tool for assessing BPH severity.
  • Accurate measurement of maximum urinary flow rate (Qmax) is crucial for treatment efficacy studies.

Purpose of the Study:

  • To evaluate the impact of uroflowmetry artifacts on Qmax measurements.
  • To compare manual versus machine-read Qmax values.
  • To assess the effect of reading methods on statistical power in finasteride therapy studies for BPH.

Main Methods:

  • A double-blind, placebo-controlled study involving 1,645 BPH patients over 1 year.
  • Monthly uroflowmetry measurements (23,857 total).
  • Comparison of manually-read Qmax values against electronically-provided uroflowmeter values.

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Main Results:

  • Machine-read Qmax values were, on average, 1.5 ml/s higher than manually-read values.
  • Artifacts causing ≥2 ml/s difference occurred in 20% of tracings; ≥3 ml/s in 9%.
  • Manual reading significantly reduced variability, increasing statistical power and reducing sample size requirements.

Conclusions:

  • Uroflowmetry artifacts substantially contribute to Qmax measurement variability.
  • Manual reading of Qmax is essential for accurate assessment and robust statistical analysis in BPH treatment trials.
  • Optimizing Qmax measurement improves the reliability of evaluating therapeutic interventions.