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Vascular Medicine, Vol. 11, No. 4, 251-257 (2006)
DOI: 10.1177/1358863x06072221

The effects of quinapril and atorvastatin on the responsiveness to sildenafil in men with erectile dysfunction

Alan J Bank

St Paul Heart Clinic, 225 North Smith Avenue, Suite 400, St Paul, MN 55102, USA. Tel: +1 651 726 6767; Fax: +1 651 379 4457; abank{at}stphc.com; University of Minnesota, Minneapolis, MN, USA

Aaron S Kelly

Daniel R Kaiser

St Paul Heart Clinic, St Paul, MN, USA; University of Minnesota, Minneapolis, MN, USA

William W Crawford

St Paul Heart Clinic, St Paul, MN, USA

Benjamin Waxman

Metro Urology, St Paul, MN, USA

Douglas A Schow

The Minnesota Men's Health Center, Woodbury, MN, USA

Kevin L Billups

University of Minnesota, Minneapolis, MN, USA; The EpiCenter for Sexual Health and Medicine, Edina, MN, USA

Phosphodiesterase-5 (PDE-5) inhibitors are an effective therapy for the majority of men with erectile dysfunction (ED). However, many men with ED still report a suboptimal or partial response even after an adequate trial of oral PDE-5 therapy. Since ED is associated with impaired vascular function and both atorvastatin and quinapril have been previously shown to improve vascular function, we examined the effects of adjunctive treatment with these medications in men with vasculogenic ED who were suboptimal responders to 100 mg of sildenafil. Men with ED and suboptimal response to sildenafil were randomly assigned to 3 months of treatment with atorvastatin 40 mg (n = 12), quinapril 10 mg (n = 10), or placebo (n = 13), along with continued adjunctive sildenafil use. Measured variables included: International Index of Erectile Function (IIEF) questionnaire, brachial artery flow-mediated dilation (FMD), endothelium-independent dilation (EID) via nitroglycerin, penile Doppler blood flow, blood pressure (BP), lipids, and C-reactive protein (CRP). Compared to placebo, quinapril (p < 0.01) significantly improved symptoms of ED as measured by the IIEF-5 questionnaire. There was a trend toward a significant improvement in IIEF-5 with atorvastatin. Similarly, quinapril significantly improved the IIEF ED Domain (p < 0.05). Other peripheral and penile vascular parameters were unchanged with drug therapy as compared to placebo. In conclusion, treatment with quinapril, in combination with sildenafil, improved ED in men with suboptimal response to sildenafil alone. Atorvastatin demonstrated a trend toward improved ED in this group.

Key Words: atorvastatin • erectile dysfunction • quinapril


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