Priapism โ
๐ Priapism = prolonged, often painful penile erection lasting >4 hours without sexual stimulation.
It is a urological emergency โ prolonged ischemia โ irreversible erectile dysfunction if untreated.
Prompt recognition and rapid management are essential to preserve function and fertility.
๐ Causes
- Haematological: Sickle cell disease, thalassemia, leukemia, polycythemia โ vaso-occlusion or hyperviscosity
- Medications: Trazodone, chlorpromazine, lithium, antipsychotics, PDE5 inhibitors, recreational drugs (cannabis, cocaine, ecstasy)
- Intracavernosal injections: Papaverine, alprostadil, phentolamine (ED therapy)
- Vascular / Trauma: Pelvic fracture, perineal injury, pelvic thrombosis
- Other: Malignancy (leukemia, lymphoma), idiopathic, metabolic disorders
โก Types of Priapism
- Ischaemic (low-flow) ๐ โ Most common, painful, rigid. Venous outflow obstruction โ hypoxia & acidosis. Emergency.
Blood is dark, hypoxic, hypercapnic.
- Non-ischaemic (high-flow) ๐ โ Usually post-traumatic, less painful, partially rigid. Arterial inflow preserved; often resolves spontaneously, rarely an emergency.
- Stuttering / recurrent priapism ๐ โ Intermittent, often in sickle cell disease; risk of fibrosis/ED over time.
๐งฌ Pathophysiology
- Low-flow: trapped deoxygenated blood โ tissue hypoxia โ acidosis โ fibrosis if untreated >24 h
- High-flow: unregulated arterial inflow, minimal hypoxia โ usually painless
- Sickle cell: rigid sickled RBCs occlude venous outflow โ ischemia
๐ ๏ธ Management (Ischaemic Priapism Emergency) ๐จ
- Initial Measures:
- Ice packs โ๏ธ and perineal compression
- Exercise (climbing stairs) to stimulate venous drainage ๐
- Analgesia + sedation ๐ (opioids, benzodiazepines)
- Pharmacological:
- First-line: Intracavernosal phenylephrine 100โ500 ยตg every 3โ5 min (alpha-1 agonist) until detumescence; monitor BP/HR
- Alternatives: epinephrine, etilefrine if phenylephrine unavailable
- Sickle-cell specific: hydration ๐ง, Oโ therapy, analgesia, ยฑ exchange transfusion
- Mechanical:
- Corporal aspiration with large-bore needle ๐
- Irrigation with normal saline ยฑ direct alpha-agonist infusion
- Surgical (last resort) โ๏ธ
- Distal shunt (Winter, Ebbehoj) or proximal shunt (Quackel) procedures
- Penile prosthesis if prolonged refractory priapism with necrosis/ED risk
๐ฌ Investigations
- Corporal blood gas: dark, acidic, hypoxic โ ischaemic; bright, oxygenated โ non-ischaemic
- Full blood count, reticulocyte count, peripheral smear (sickle cell, leukemia)
- U&E, LFTs, coagulation if systemic illness suspected
- Imaging: Doppler ultrasound for high-flow / vascular assessment
๐ Key Clinical Pearls
- Ischaemic priapism = emergency โ immediate intervention to prevent irreversible ED
- Non-ischaemic priapism = post-traumatic, less urgent; may observe ยฑ selective embolisation
- Sickle-cell patients: higher recurrence; manage both priapism & underlying vaso-occlusive crisis
- Delay >24 hrs = high risk of permanent erectile dysfunction & fibrosis
- Prompt urology referral essential; treat underlying cause where possible
Cases - Priapism
- Case 1 - Sickle Cell (Ischaemic Priapism) ๐ฉธ
19-year-old male, sickle cell anaemia, painful erection >4h. Previous brief episodes.
Diagnosis: Low-flow priapism secondary to sickle cell vaso-occlusion.
Management: Urgent urology; aspiration ยฑ phenylephrine; hydration, oxygen, analgesia; treat sickle crisis.
- Case 2 - Drug-Induced Priapism ๐
45-year-old male with schizophrenia, erection lasting 5h after trazodone. No haematological disease.
Diagnosis: Drug-induced ischaemic priapism.
Management: Stop offending drug; aspiration ยฑ phenylephrine; monitor recurrence.
- Case 3 - Malignancy-Related Priapism ๐๏ธ
32-year-old male, acute leukemia, painful erection 6h, WCC 180 ร10โน/L.
Diagnosis: Hyperviscosity-related priapism.
Management: Urgent urology; treat underlying malignancy (hydroxyurea, leukapheresis); IV fluids, analgesia.
Teaching Commentary ๐
Priapism is a urological emergency when ischaemic. Key principles:
- Recognize early (<4โ6h), differentiate ischaemic vs high-flow
- Immediate measures: analgesia, aspiration, alpha-agonist injections
- Treat underlying cause (sickle cell, drug withdrawal, malignancy)
- High-flow non-ischaemic priapism is usually less urgent; embolisation if persistent
- Delayed management (>24h) โ permanent ED, fibrosis, penile shortening
- Recurrent priapism in sickle cell may require preventive strategies (hydroxyurea, PDE5 inhibitors low-dose, education)
Prevention & Follow-Up ๐ก๏ธ
- Sickle cell: maintain hydration, treat vaso-occlusive crises promptly
- Medication review: avoid or adjust drugs known to cause priapism
- Post-priapism erectile function assessment; early urology follow-up
- Education: patients with recurrent episodes instructed to seek urgent care immediately
๐ References
- NICE CG175: Management of ED and Priapism
- Mulhall JP et al., Priapism: Current Principles and Practice, BJU Int, 2013
- Burnett AL, Priapism: Pathophysiology and Treatment, Nat Rev Urol, 2009
- Bhakta H et al., Sickle CellโRelated Priapism, Haematologica, 2018