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Venous leak. (a) Unstimulated Doppler trace of cavernosal artery. (b) Systolic velocities indicating adequate arterial inflow with elevated diastolic flow (6.2 cm s–1) following intracavernosal injection of pharmacostimulant. (c, d) As the study progresses, the diastolic flow remains abnormally persistently elevated (7.4 cm s–1), signalling venous leak.
