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Opening contraction energy in prostatic (compressive) obstruction.

A Cucchi1, R van Mastrigt

  • 1Division of Urology, Policlinico S. Matteo, Pavia, Italy.

Urologia Internationalis
|January 1, 1990
PubMed
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Opening contraction energy (Eop) in men with benign prostatic hypertrophy correlates with bladder emptying efficiency. Higher Eop indicates greater obstruction and reduced bladder voiding capability, suggesting Eop can quantify obstruction severity.

Area of Science:

  • Urology
  • Biomedical Engineering

Background:

  • Benign prostatic hypertrophy (BPH) commonly causes bladder outflow obstruction in aging males.
  • Assessing the severity of BPH-induced obstruction is crucial for effective management.
  • Existing methods may not fully capture the dynamic functional impact of obstruction.

Purpose of the Study:

  • To investigate the relationship between opening contraction energy (Eop) and bladder emptying parameters in men with BPH.
  • To determine if Eop can serve as an indicator of detrusor function and obstruction severity.

Main Methods:

  • Measured opening contraction energy (Eop) in 70 males with BPH-induced bladder outflow obstruction.
  • Analyzed correlations between Eop, maximum external voiding power (Wext max), and voided volume percentage (VV%).

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Main Results:

  • Found significant negative correlation between Eop and VV% (rs = -0.77), indicating higher Eop is associated with poorer bladder emptying.
  • Observed significant negative correlation between Eop and Wext max (rs = -0.57).
  • Demonstrated significant positive correlation between Wext max and VV% (rs = 0.65).

Conclusions:

  • Opening contraction energy (Eop) reflects not only the initial phase but also the overall efficiency of micturition.
  • Increased Eop suggests greater resistance to urine flow, impairing the detrusor muscle's ability to completely empty the bladder.
  • Eop may provide a single numerical index for quantifying the degree of prostatic obstruction.