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Related Experiment Videos

The obstructive effect of a urethral catheter

J M Reynard1, C Lim, S Swami

  • 1Bristol Urological Institute, Southmead Hospital, United Kingdom.

The Journal of Urology
|March 1, 1996
PubMed
Summary

An 8 French urethral catheter does not significantly obstruct the urethra in men with benign prostatic hyperplasia. This finding is crucial for accurate pressure-flow studies in diagnosing lower urinary tract symptoms.

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Area of Science:

  • Urology
  • Medical Devices
  • Diagnostic Procedures

Background:

  • Benign prostatic hyperplasia (BPH) commonly causes lower urinary tract symptoms (LUTS) in men.
  • Urethral catheterization is often used in diagnostic procedures, but its potential obstructive effects are debated.
  • Accurate pressure-flow studies are essential for diagnosing and managing LUTS in BPH patients.

Purpose of the Study:

  • To assess the obstructive effect of an 8 French (Ch.) urethral catheter on urethral pressure-flow relationships.
  • To evaluate the impact of catheterization on key urodynamic parameters in men with BPH and LUTS.

Main Methods:

  • A comparative study involving 59 men with LUTS due to BPH.
  • Combined pressure-flow studies were conducted during two voiding cycles: one with and one without an 8 Ch. urethral catheter.

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  • Measured parameters included maximum flow rate, detrusor pressure at maximum flow, and urethral resistance factor.

    • Main Results:

    • No significant difference was observed in maximum flow rate between voiding with (9.1 ml/s) and without (8.6 ml/s) the catheter.
    • Detrusor pressure at maximum flow was significantly higher with the catheter in situ (80 cm water vs. 67 cm water).
    • Urethral resistance factor also showed a significant increase with the catheter in situ (42.1 cm water vs. 36.6 cm water).

    Conclusions:

    • An 8 Ch. urethral catheter does not appear to cause significant urethral obstruction in men with BPH.
    • The findings suggest that standard catheterization practices may not unduly influence pressure-flow study results.
    • This has important implications for the clinical interpretation of pressure-flow studies in the context of LUTS evaluation.