Are normal hemodynamic responses invariably associated with normal penile rigidity and potency?

The existence and importance of patients with low penile buckling pressure and normal penile hemodynamic status have been recently recognized. We asse ssed the ratio of inadequate erection for vaginal penetration (low buckling pressure) in patients with normal penile vascular system proved with penil e Doppler ultrasonography. A total of 101 patients with normal penile vascu lar status were retrospectively scrutinized dependent on penile axial rigid ity (buckling pressure). Ninety patients had sufficient penile axial rigidi ty (greater than or equal to 550 g) whereas in the remaining 11 patients (1 1%) inadequate penile buckling pressure for vaginal penetration (<550 g) wa s determined. Penile geometric and mechanical properties should not be over looked during the evaluation of penile vascular system lest the patient be incorrectly diagnosed as having psychogenic impotence.