Regimented Phosphodiesterase Type 5 Inhibitor Use Reduces Emergency Department Visits for Recurrent Ischemic Priapism

PURPOSE: We evaluated the real-world effectiveness of regimented phosphodiesterase type 5 inhibitor dosing on recurrent ischemic priapism outcomes using emergency department visits as a proxy for therapeutic control of the disorder. MATERIALS AND METHODS: We performed a retrospective chart review of patients with recurrent ischemic priapism who were started on regimented phosphodiesterase type 5 inhibitor therapy from May 2006 to January 2020. We compared the number of emergency department visits per month during a 6-month period before treatment, during treatment and after treatment discontinuation. We extracted and categorized priapism outcomes such as priapism frequency and duration. RESULTS: Of 216 patients identified with all cause priapism 114 were diagnosed with recurrent ischemic priapism and 42 were initiated on regimented phosphodiesterase type 5 inhibitor therapy. Treatment effectiveness was analyzed for 24 evaluable patients. Priapism etiology was idiopathic in 12 patients (50%), sickle cell disease in 11 (46%) and drug-induced in 1 (4%). The median length of regimented phosphodiesterase type 5 inhibitor use was 3 months (IQR 2-7). Treatment decreased emergency department visits per month by 4.4-fold (p <0.001), priapism duration tiers (p <0.001) and priapism frequency tiers (p <0.001). Of 24 patients 22 (92%) reported improvement in priapism outcomes, 9 of whom reported resolution of recurrent ischemic priapism episodes. A subgroup analysis of 17 patients with recurrent ischemic priapism relapse after treatment discontinuation showed a significant increase in priapism duration (p <0.001) and frequency (p <0.001) but no significant change in emergency department visits per month (p=0.91). CONCLUSIONS: Regimented phosphodiesterase type 5 inhibitor therapy was an impactful treatment in managing recurrent ischemic priapism according to objective and subjective parameters. This study provides further support for the use of regimented phosphodiesterase type 5 inhibitor dosing as a preventive strategy for recurrent ischemic priapism.