Emergency Briefcase

Priapism

Rapid recognition, phenotype-directed evaluation, and time-critical management of a prolonged erection.

Critical emergency: A painful, fully rigid erection lasting about 4 hours should be treated as acute ischemic priapism until proven otherwise. Do not delay corporal decompression for extensive testing or treatment of an underlying disorder.

Low-flow

Ischemic priapism

≈95%

Painful; corpora cavernosa fully rigid
Glans may remain soft
Dark, hypoxic aspirate
Compartment syndrome of the corpora
Immediate decompression required

High-flow

Nonischemic priapism

Often follows blunt perineal or penile trauma
Usually painless and partially rigid
Bright red aspirate if sampled
Arterial inflow persists
Not usually an immediate emergency

Immediate actions

Document onset, pain, rigidity, medications, injections, trauma, sickle cell disease, malignancy, and prior episodes.
Examine the shaft, glans, perineum, abdomen, and neurologic status.
Call urology early while preparing analgesia, block, aspiration/irrigation, and intracavernosal phenylephrine.
Use corporal blood gas when the phenotype is uncertain; Doppler ultrasound is adjunctive when needed.

Frequent causes

Idiopathic Sickle cell disease Intracavernosal agents Trazodone Antipsychotics PDE-5 inhibitors Leukemia Pelvic trauma

Do not rely on ice, exercise, ejaculation, oral pseudoephedrine, or terbutaline to delay definitive treatment of established acute ischemic priapism.

ABEM-style decision 1: A patient has a painful, rigid erection for 5 hours. What is the best next step? Apply ice and reassess in one hour Order penile MRI before intervention Treat as ischemic priapism with prompt corporal decompression and intracavernosal phenylephrine Give oral terbutaline and discharge

Teaching point: Ischemic priapism is a time-sensitive corporal compartment syndrome. Clinical findings usually establish the phenotype; definitive bedside treatment should not wait for advanced imaging.

Focused evaluation

History and examination

Exact onset and duration; pain trajectory
Degree of rigidity and whether the glans is involved
Previous episodes or erectile dysfunction
Sickle cell disease/trait, hematologic malignancy, pelvic trauma
Prescription, recreational, and erectile-dysfunction drugs
Intracavernosal injection timing and dose

Testing must not delay treatment when ischemic priapism is clinically apparent.

Corporal blood gas

Pattern	pH	PO₂	PCO₂
Ischemic	<7.25	<30 mm Hg	>60 mm Hg
Nonischemic	>7.30	>90 mm Hg	<40 mm Hg

Selective tests

CBC, reticulocyte count, and peripheral smear as indicated
Toxicology or medication-specific testing when relevant
Color duplex ultrasound if the diagnosis remains uncertain or high-flow priapism is suspected

ABEM-style decision 2: Which result most strongly supports ischemic priapism? Painless partial rigidity after perineal trauma Dark corporal blood with pH 7.10, PO₂ 20, and PCO₂ 75 mm Hg High cavernosal arterial flow on Doppler Bright red corporal aspirate

Teaching point: Ischemic corporal blood resembles a venous, acidotic compartment: low oxygen, high carbon dioxide, and low pH.

Analgesia and local anesthesia Provide systemic analgesia and perform a penile ring block or dorsal penile nerve block as appropriate.

Aspirate and irrigate Access one or both corpora laterally; aspirate dark blood and irrigate with normal saline until fresher blood returns and detumescence improves.

Intracavernosal phenylephrine Administer in small, repeated doses with blood-pressure and heart-rate monitoring. Phenylephrine may be given before, during, or after aspiration and irrigation.

Reassess frequently Track rigidity, pain, color of aspirate, hemodynamics, and total drug delivered. Stop for significant hypertension, reflex bradycardia, arrhythmia, or other toxicity.

Escalate without delay If bedside therapy fails, urology proceeds to operative management, typically a distal corporoglanular shunt with or without tunneling. Prolonged presentations require counseling about erectile dysfunction and possible prosthesis pathways.

Sickle cell disease: Hydration, oxygen when hypoxemic, analgesia, and hematology-directed care are adjuncts. Exchange transfusion is not routine first-line therapy and must not postpone corporal aspiration and phenylephrine.

ABEM-style decision 3: A patient with sickle cell disease has ischemic priapism. Which strategy is best? Exchange transfusion before any penile intervention Oxygen alone until the erection resolves Aggressive crystalloid until hemoglobin normalizes Treat the ischemic priapism directly while also addressing sickle-cell-related needs

Teaching point: Etiology-specific care is concurrent, not a substitute for decompression of the ischemic corpora.

Preferred sympathomimetic

Phenylephrine

Typical guideline regimen: 100–500 micrograms diluted in 1 mL normal saline, injected intracavernosally every 5 minutes while assessing detumescence.

Monitor BP Monitor HR/rhythm Track cumulative dose

Use lower initial doses and heightened monitoring in patients with significant cardiovascular or cerebrovascular disease. Follow local pharmacy preparation and urology protocols.

Adverse effects and stop signals

Marked hypertension
Reflex bradycardia or tachyarrhythmia
Chest pain or ischemic ECG changes
Severe headache or neurologic symptoms

Safety: Confirm the concentration and label the syringe. Medication-concentration errors can cause serious harm.

What is not definitive therapy?

Oral pseudoephedrine
Terbutaline
Ice packs or cold showers
Exercise
Ejaculation

These must not delay aspiration, irrigation, and intracavernosal therapy for established ischemic priapism.

Nonischemic pathway

High-flow priapism usually permits observation and urologic follow-up. Persistent or bothersome cases may require angiography with selective arterial embolization. Corporal aspiration and phenylephrine are not the routine pathway when arterial high-flow physiology is confirmed.

ABEM-style decision 4: What monitoring is most important during repeated intracavernosal phenylephrine? Blood pressure, heart rate/rhythm, symptoms, and cumulative dose Continuous intracranial pressure Serial serum lipase Daily echocardiography

Teaching point: Intracavernosal phenylephrine can produce systemic alpha-adrenergic effects; close hemodynamic monitoring and accurate dose tracking are essential.

Bedside setup

Aspiration and irrigation

Consent, monitoring, sterile preparation, analgesia, and local block
Large-bore butterfly or angiocatheter, syringes, saline, tubing, and dressings
Enter the corpus cavernosum laterally, commonly at the 3 or 9 o’clock position, to avoid the dorsal neurovascular bundle and ventral urethra
Aspirate in aliquots and irrigate as needed until brighter blood and detumescence
Administer intracavernosal phenylephrine according to protocol
Apply compression after catheter removal and reassess

Procedure safeguards

Avoid: Dorsal 12 o’clock and ventral 6 o’clock needle paths.

Verify the drug concentration aloud
Use closed-loop cumulative-dose communication
Monitor for hematoma, bleeding, infection, urethral injury, and systemic drug effects
Document pre- and post-procedure rigidity, pain, aspirate character, total volume, total phenylephrine, response, and consultation

Endpoint: Meaningful detumescence with improved pain and restoration of corporal perfusion—not merely a temporary pressure change.

ABEM-style decision 5: What is the safest usual corporal entry orientation? 12 o’clock through the dorsal neurovascular bundle 6 o’clock through the urethral side Lateral shaft at approximately 3 or 9 o’clock Directly through the glans as the only bedside option

Teaching point: A lateral corporal approach reduces risk to the dorsal neurovascular bundle and ventral urethra.

Case score

0/5 decisions correct

Complete the five questions for your interpretation.

Critical actions

Distinguish ischemic from nonischemic physiology immediately.
Treat a painful, fully rigid erection of about 4 hours as ischemic until proven otherwise.
Do not delay decompression for testing or disease-specific adjuncts.
Use aspiration and irrigation plus intracavernosal phenylephrine with monitoring.
Escalate failed bedside treatment promptly to urology.
Counsel prolonged presentations about erectile dysfunction risk.