Priapism Management (#2)
Thanks for a great shift! Here are the key points from today's pre-shift discussion on priapism recognition and management in the ED. This is an elaboration of an Post Shift Pearls August 2025 Post.
Definition and Types
Priapism is a prolonged erection lasting >4 hours that is unrelated to sexual stimulation.
Ischemic (low-flow) priapism: Little or no cavernosal blood flow resulting in venous congestion, hypoxia, acidosis, and progressive ischemia. This is a urologic emergency.
Non-ischemic (high-flow) priapism: Persistent arterial inflow with preserved venous outflow. It is often associated with perineal trauma and an arterial-cavernosal fistula. It is generally less painful, less rigid, and not a urologic emergency.
Prolonged ischemia can cause cavernosal smooth-muscle injury, fibrosis, and subsequent erectile dysfunction. As the duration of ischemia increases, patients also become increasingly refractory to bedside treatment.
History and Physical Exam
Important history includes:
Duration of erection
Degree of pain
Recent penile or perineal trauma
Previous episodes and treatments
Sickle cell disease or other hematologic disorders
Baseline erectile function
Medications, including PDE-5 inhibitors and intracavernosal ED medications
Medications/substances associated with priapism, including trazodone, antipsychotics, alpha-blockers, cocaine, and other recreational drugs
Ischemic priapism is typically painful with fully rigid corpora cavernosa. The glans and corpus spongiosum generally remain soft.
Non-ischemic priapism is typically painless or minimally painful with partial corporal tumescence rather than complete rigidity.
Diagnosis
When the presentation is classic for ischemic priapism, the diagnosis is primarily clinical and treatment should not be delayed.
If the diagnosis is uncertain, a cavernosal blood gas can be obtained during aspiration.
Typical ischemic findings:
Dark cavernosal blood
pO₂ <30 mmHg
pCO₂ >60 mmHg
pH <7.25
Penile duplex ultrasound can assess cavernosal arterial flow and help distinguish ischemic from non-ischemic priapism, but it is not generally necessary before treatment when the clinical diagnosis is clear.
Treatment of Ischemic Priapism
Conservative measures such as exercise, ejaculation, ice packs, and cold baths are unlikely to successfully resolve acute ischemic priapism and should not delay definitive treatment.
1. Analgesia and Anesthesia
Provide appropriate analgesia and anxiolysis. A dorsal penile nerve block or penile ring block can provide excellent procedural anesthesia.
For a dorsal penile nerve block, the dorsal nerves can be approached around the 10 and 2 o'clock positions, immediately distal to the pubic symphysis.
2. Aspiration and Irrigation
Insert an 18–21G needle into the lateral aspect of the corpus cavernosum.
10 and 2 o'clock or 9 and 3 o'clock are reasonable approaches.
Practically, an appropriate lateral mid-shaft approach works.
Avoid the ventral shaft to avoid the urethra.
The corpora cavernosa communicate, so bilateral needles are generally unnecessary.
An 18G needle makes aspiration of thick, stagnant blood easier. Some physicians advocate for going as large as 16G.
Aspirate approximately 20–30 mL at a time until detumescence occurs and the aspirated blood becomes brighter.
If aspiration is difficult or the blood is particularly viscous:
Irrigate with normal saline
Re-aspirate
Use gentle manual compression/milking to help decompress stagnant blood
3. Intracavernosal Phenylephrine
If aspiration and irrigation do not produce adequate detumescence, proceed with intracavernosal phenylephrine.
A practical regimen:
Phenylephrine concentration: 100 mcg/mL
Give 1 mL (100 mcg) intracavernosally every 3–5 minutes
Continue aspiration/irrigation as necessary
Maximum cumulative dose approximately 1,000 mcg over one hour
Patients should have blood pressure and cardiac monitoring, particularly those with significant cardiovascular disease.
Phenylephrine and aspiration tend to be more successful earlier in the course. With prolonged ischemia, patients may become increasingly refractory to first-line treatment.
4. If It Doesn't Work
Persistent ischemic priapism despite aspiration, irrigation, and intracavernosal phenylephrine requires urgent urologic management, potentially including operative intervention.
Even in patients presenting late, bedside treatment can still be attempted, but prolonged duration makes successful nonsurgical treatment less likely.
Duration and Counseling
Duration matters both for treatment success and long-term erectile function.
Prolonged ischemia causes progressive cavernosal smooth-muscle injury and fibrosis. All patients with acute ischemic priapism should be counseled about the possibility of subsequent erectile dysfunction.
For ischemic priapism lasting >36 hours, patients should be counseled that the likelihood of recovering normal erectile function is low.
Non-Ischemic Priapism
Non-ischemic priapism does not require emergent aspiration and phenylephrine.
It is typically:
Painless or minimally painful
Partially rather than completely rigid
Associated with preserved arterial flow
Often related to perineal trauma
These patients should receive urologic evaluation. Observation is appropriate in many cases, while persistent cases may ultimately require selective arterial embolization.
Procedure Review
Please review the videos below! They will help bring all of this together.
References
Bivalacqua TJ, Allen BK, Brock G, et al. Acute ischemic priapism: an AUA/SMSNA guideline. J Urol. 2021;206(5):1114-1121. doi:10.1097/JU.0000000000002236.
Silberman M, Leslie SW, Hu EW. Priapism. Updated September 14, 2025. In: StatPearls [https://www.ncbi.nlm.nih.gov/books/NBK459178/]. StatPearls Publishing; 2026.
Mohan N, Leslie SW, Deibert CM. Penile irrigation, aspiration, and vasoactive injections for priapism treatment. Updated September 28, 2025. In: StatPearls [https://www.ncbi.nlm.nih.gov/books/NBK557696/]. StatPearls Publishing; 2026.
McPhee AS, McKay AC. Dorsal penile nerve block. Updated February 18, 2023. In: StatPearls.[https://www.ncbi.nlm.nih.gov/books/NBK535389/] StatPearls Publishing; 2026.
