The prediction of papaverine induced priapism by color Doppler sonography

Purpose: We identified color Doppler sonography findings that are useful fo r predicting priapism in patients after the intracavernous injection of dia gnostic papaverine. Materials and Methods: We evaluated 72 men with erectile dysfunction by col or Doppler sonography after the diagnostic injection of papaverine. Caverno us artery waveforms were recorded, and peak systolic and diastolic velocity of the recorded waveforms was measured. In cases of priapism color Doppler sonography findings were retrospectively evaluated to identify any finding that would predict priapism. Results: Priapism was observed in 8 of the 72 patients (11.1%). In 6 of 8 p riapism cases there was no blood flow in the cavernous artery during or aft er adequate erection, including after minutes 5, 10 and 20 in 3, 1 and 2, r espectively. This absence of encoding was not relieved even after all stimu li were removed. In 2 patients who later presented with complaints of priap ism the Doppler study was completed normally and all parameters were acquir ed without any cessation of blood flow in the cavernous artery. The persist ent disappearance of color and pulse encoding in the cavernous artery predi cted priapism with 75% sensitivity, 100% specificity, a positive and negati ve predictive value of 100% and 96.9%, respectively, and 97% accuracy. Conclusions: The persistence of absent blood flow in the cavernous artery e ven after the elimination of all stimuli during penile color Doppler ultras ound is a reliable predictor of priapism. The finding is accurate enough to initiate treatment for priapism to avoid further delay.