Intracavernosal injections in the diagnosis and treatment of PDE–5 resistant erectile dysfunction

摘要

Dupplex Doppler study after intracavernosal injection(ICI) of vasoactive drugs is a valuable tool inthe evaluation of vascular status in patients sufferingfrom erectile dysfunction [1]. Normal erectionafter ICI suggests sufficient venous occlusion. Persistentdiastolic cavernous blood flow measured byend–diastolic velocity (EDV) despite adequate arterialinflow measured by peak systolic velocity (PSV)suggests insufficient veno–occlusive mechanismwhich results in venous leakage [1]. EDV >5 cm/sand resistive index (RI) less than 0.75 have beenuniversally accepted as pathologic reflecting venousoutflow, though controversies exist about normalvalues of PSV. EAU recommends considering PSVof >30 cm/s, EDV 0.8 as normalwhile some authors consider PSV values between25 and 35 and EDV between 5 and 7 cm/s as greyzone