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Related Experiment Videos

Sildenafil non-responders: haemodynamic and morphometric studies.

Eric Wespes1, Adham Rammal, Christian Garbar

  • 1Department of Urology and Pathology, C.H.U. de Charleroi, Charleroi and Hôpital Erasme, 808 route de Lennik, 1070 Brussels, Belgium. dr.wespes@skynet.be

European Urology
|June 22, 2005
PubMed
Summary

Sildenafil non-responders often have severe vascular issues and reduced smooth muscle. These factors, not age, diabetes, or low testosterone, are key to understanding treatment failure in erectile dysfunction.

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Area of Science:

  • Urology
  • Andrology
  • Vascular Biology

Background:

  • Efficacy data for sildenafil in erectile dysfunction (ED) often relies on subjective questionnaires.
  • ED is frequently categorized by the severity of organic factors, impacting treatment selection.

Purpose of the Study:

  • To investigate the haemodynamic and morphometric characteristics of sildenafil non-responders.
  • To identify factors differentiating sildenafil responders from non-responders.

Main Methods:

  • A study involving 30 male patients with ED who did not respond to sildenafil.
  • Hormonal assessments, intracavernous injections with Doppler, cavernosometry, and penile biopsies for smooth muscle quantification were performed.

Main Results:

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  • 28 patients showed poor response to intracavernous injections, with reduced smooth muscle (SMC <35%).
  • Vascular abnormalities (arterial lesions, venous leak) were present in 18 patients.
  • Two patients without biological or vascular issues had normal SMC percentages (38-42%).

Conclusions:

  • Severe vascular lesions and smooth muscle atrophy are primary findings in sildenafil non-responders.
  • Patient age, diabetes, and low testosterone levels did not appear to be significant factors in sildenafil treatment failure.