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(A and B): Venous leak (veno-occlusive insufficiency). Bilateral spectral Doppler waveforms (A and B) of the cavernosal arteries at 25 min post-injection of prostaglandin E1 demonstrate a high peak systolic velocity (>40 cm/s), which excludes arterial insufficiency as a cause of erectile dysfunction in this patient. However, a persistent diastolic flow velocity of more than 5 cm/s is suggestive of venous leak
