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Not medical advice. The Atlas is not a substitute for a clinician who can examine you.

High-Flow (Non-Ischemic) Priapism

Arterial Priapism, Arterio-Lacunar Fistula

Evidence grade 4 of 5, Strong. Read how the Atlas grades evidence.

The written rationale for this grade is still being prepared.

FDA
Managed per AUA/SMSNA guideline (2022); embolization is procedural

Reference only. Not medical advice.

What can go wrong

The main risks are iatrogenic: unnecessary aggressive intervention on a non-emergent, non-ischemic condition, and erectile dysfunction from over-embolization. Embolization should be superselective and, where possible, use temporary or non-permanent agents first to preserve erectile function.

This is something to take to a clinician. The Atlas can tell you what is known about high-flow (non-ischemic) priapism in general. It cannot tell you what is happening in your body, and the difference matters most for exactly the symptoms that bring people to this page.

High-flow priapism results from an arterio-lacunar (arterio-cavernous) fistula, most often after perineal or penile trauma that lacerates a cavernosal artery branch. Unlike ischemic priapism, the erection is partial and painless, and cavernosal blood gas shows high pO2 (>90 mmHg) and pH (>7.4) - oxygenated, not stagnant. This subtype is not a surgical emergency; observation is a valid first line, with superselective embolization reserved for persistence.

Not an emergency, not painful, and often best watched - the mirror image of ischemic priapism.

What people take it for

What it is taken for. Approval, where it exists, covers only some of these.

  • Post-traumatic persistent partial erection workup
  • Erectile-function-preserving management planning

How it works

Trauma lacerates a perforating branch of the cavernosal artery, creating an unregulated arterial inflow directly into the lacunar spaces. Because inflow is oxygenated and outflow is preserved, the tissue is not ischemic - which is why the clinical urgency and management differ fundamentally from low-flow priapism.

How it is taken

AUA/SMSNA: initial observation or perineal compression, with reassessment (guidelines suggest around four weeks) given frequent spontaneous resolution. Persistent cases are treated with superselective transarterial embolization of the fistula by interventional radiology.

What people get wrong

  • Often saidAll priapism is a medical emergency requiring immediate drainage

    ActuallyOnly ischemic (low-flow) priapism is a true emergency. High-flow priapism is oxygenated, painless, and frequently resolves with observation - aspiration is not the treatment.

Who profits, and who pushes back

Nobody is named here yet, because we have not done that work on this entry. Read that as unfinished. Somebody almost certainly sells this, and somebody almost certainly disputes it. Assume both until we have checked.

At a glance

Blood gas
High pO2 (>90 mmHg), pH >7.4 (oxygenated)
Pain
Absent; erection partial
Usual cause
Perineal/penile trauma with arterial laceration

What this entry does not yet cover

What follows is unfinished work on our side, not a finding about High-Flow (Non-Ischemic) Priapism. A short entry is not a safe entry.

  • Timeline. We have not built the dated record of research and regulatory events.
  • Cost and market. We have not documented what it sells for or who sells it.
  • Supply chain. We have not mapped where it is made.
  • Who uses it. We have not documented the user groups.
  • What could change. No forward-looking summary yet.
  • How it compares. We have not set it against the alternatives.
  • Children and teenagers. We have not checked what is known about younger people.
  • Where we land. We have not taken a position on this yet.

Sources

The studies below are named and described, but not linked. You cannot open them from here and check our reading against them, which means this page is our summary of the literature rather than a document you can verify. Weigh it accordingly until the links exist.

The studies that matter

  • Long-term outcomes of superselective embolization in high-flow priapism (Int J Impot Res)2025

    Non-absorbable-agent embolization showed durable efficacy with preserved erectile function over 10+ years

  • Systematic review of angioembolization outcomes (PMC12063919)2020s

    Favorable symptom resolution and erectile-function preservation rates