Treatment of Priapism

Diagnostic Differentiation

The American Urological Association recommends obtaining a corporal blood gas immediately to distinguish ischemic from non-ischemic priapism, as this determines whether you are managing a true urological emergency or a condition that can be observed 1, 2
Ischemic priapism is characterized by PO₂ <30 mmHg, PCO₂ >60 mmHg, pH <7.25, while non-ischemic priapism is characterized by PO₂ >90 mmHg, PCO₂ <40 mmHg, pH 7.40 1, 3

The American Urological Association recommends intracavernosal phenylephrine injection with corporal aspiration as first-line treatment for ischemic priapism lasting >4 hours, regardless of underlying etiology 1, 5
The recommended phenylephrine concentration is 100-500 mcg/mL, with a maximum dose of 1000 mcg within the first hour 4
Aspiration and irrigation should accompany phenylephrine injection, with a success rate of 43-81% when combined 4, 5, 6

The American Urological Association recommends observation for up to 4 weeks as initial management for non-ischemic priapism, as it is not an emergency and resolves spontaneously in up to 62% of cases 7, 4
Selective arterial embolization using temporary absorbable materials is the treatment of choice for non-ischemic priapism that persists and requires treatment 7

The American Urological Association recommends PDE5 inhibitors (tadalafil or sildenafil) as first-line preventative therapy for patients with recurrent ischemic priapism, as they reduce frequency and duration with no negative side effects 5
Alternative preventative options include ketoconazole with prednisone, hydroxyurea (specifically for sickle cell disease patients), and home self-injection of phenylephrine on an as-needed basis 5, 4

Delaying corporal blood gas analysis can lead to delayed diagnosis and inappropriate treatment 3
Using exchange transfusion as primary treatment in sickle cell patients can delay effective urologic intervention by hours without proven benefit 5, 6
Using aspiration/sympathomimetics for non-ischemic priapism is ineffective and potentially harmful 7
Waiting beyond 4 hours to initiate treatment for ischemic priapism can result in smooth muscle edema and progressive irreversible damage 3
Failing to obtain adequate drug history can lead to missed diagnoses and inappropriate treatment 3