Prostate Artery Embolization (PAE)

Introduction

Prostate artery embolization, usually shortened to PAE, is a minimally invasive procedure used to treat an enlarged prostate. It is performed by an interventional radiologist — a doctor who uses imaging to guide thin tubes called catheters through the blood vessels to treat conditions from the inside. Instead of cutting or removing prostate tissue, PAE works by blocking the small arteries that supply the prostate. With less blood flow, the prostate gradually shrinks, and the urinary symptoms it causes tend to ease.

If you are reading this, you most likely already have a diagnosis of benign prostatic hyperplasia (BPH) — the medical name for a non-cancerous enlargement of the prostate gland — and your urologist or interventional radiologist has mentioned PAE as one of the options. This article walks through what PAE is, who it tends to suit, how it compares to the other treatments for an enlarged prostate, how to prepare, what the day of the procedure looks like, what recovery feels like, and what to expect over the months and years that follow.

What Is Prostate Artery Embolization?

The prostate is a small gland that sits below the bladder and surrounds the urethra, the tube that carries urine out of the body. As men age, the prostate often grows larger. When it does, it can squeeze the urethra and push against the bladder, causing the cluster of symptoms doctors call lower urinary tract symptoms, or LUTS: a weak urinary stream, hesitancy starting urination, dribbling, a feeling of incomplete emptying, urinating frequently, and waking at night to urinate (nocturia).

Most treatments for an enlarged prostate work by removing, vaporising, or otherwise cutting away the obstructing tissue. PAE takes a different route. The interventional radiologist threads a very thin catheter through an artery — usually in the wrist or groin — and steers it under X-ray guidance into the small arteries that feed the prostate. Tiny particles, called embolic microspheres, are then injected through the catheter. These particles block the blood supply to the prostate. Over the following weeks, parts of the gland shrink, and the pressure on the urethra and bladder eases.

Because nothing is cut, removed, or burnt inside the prostate or the urethra, PAE is considered an organ-sparing procedure. There is no surgical wound on the prostate, no catheter passed through the penis to cut tissue, and usually no general anaesthesia.

PAE is most often used for BPH. Less commonly, interventional radiologists also use prostate artery embolization to control bleeding from the prostate — for example, after prostate surgery, in some men with advanced prostate cancer, or in cases of severe blood in the urine (haematuria) that has not settled with other measures.

Why Is Prostate Artery Embolization Performed?

The main reason PAE is performed is to relieve bothersome urinary symptoms caused by an enlarged prostate when medication is not working well enough, is causing side effects, or is not acceptable to the patient. Doctors commonly consider PAE in the following situations:

• Moderate to severe LUTS from BPH that have not improved enough with medications such as alpha-blockers (for example, tamsulosin) or 5-alpha reductase inhibitors (for example, finasteride or dutasteride).
• Men who want to avoid the specific risks of prostate surgery, particularly retrograde ejaculation (semen flowing backward into the bladder during orgasm), and who have discussed this preference with their doctor.
• Men with a very large prostate, where some surgical options become more difficult and PAE remains technically feasible.
• Men with significant other illnesses — heart disease, lung disease, bleeding tendencies, or those on blood thinners — for whom general or spinal anaesthesia carries higher risk.
• Men with chronic urinary retention who are dependent on a catheter and are not suitable candidates for, or wish to avoid, transurethral surgery.

Beyond BPH, PAE is also used in selected cases to stop bleeding from the prostate when that bleeding is heavy, persistent, or difficult to control by other means. This is a different clinical situation from PAE for an enlarged prostate, but the technique — blocking the prostate's blood supply through a catheter — is essentially the same.

Who Is a Candidate?

Whether PAE is the right option in any individual case is a clinical decision made between the patient, the urologist, and the interventional radiologist after appropriate tests. There are, however, broad patterns that influence candidacy.

Factors that generally favour PAE

• Confirmed BPH causing moderate to severe symptoms (often measured using a questionnaire called the International Prostate Symptom Score, or IPSS).
• A prostate that is enlarged on imaging or examination, often 40 grams or larger, though PAE can be considered for smaller and very large prostates as well.
• Symptoms that have not responded adequately to medication, or medication side effects that are not tolerable.
• Health conditions that make surgery under general or spinal anaesthesia higher risk.
• A strong preference to preserve sexual function, particularly ejaculation.
• Men on long-term blood thinners that cannot be safely stopped for surgery, in some cases.

Factors that may make PAE less suitable

• Severe atherosclerosis (hardening and narrowing of the arteries) that makes safe catheter navigation to the prostate arteries difficult.
• Active urinary tract infection that has not been treated.
• Bladder problems where the main issue is not prostate obstruction — for example, a poorly contracting bladder muscle — because shrinking the prostate will not address the underlying cause.
• Known prostate cancer that requires definitive cancer treatment (although PAE may still be used for symptom control in specific cancer-related situations).
• Severe contrast allergy or advanced kidney disease, since PAE uses iodinated contrast dye under X-ray.
• Bladder stones or other anatomical issues that need direct surgical management.

Before agreeing to PAE, your doctor will usually want a clear picture of three things: how big the prostate is and what shape it takes, how the bladder is functioning, and whether the pelvic arteries can be safely accessed. The investigations described in the “Preparing for PAE” section below help answer those questions.

Alternatives

An enlarged prostate has more treatment options today than at any previous time, and PAE is one of several. The main alternatives fall into four groups: watchful waiting, medication, minimally invasive office or day-procedure treatments, and surgery.

Watchful waiting and lifestyle changes

For mild symptoms that are not significantly affecting daily life, doctors often recommend monitoring with lifestyle adjustments: reducing fluid intake in the evening, limiting caffeine and alcohol, double voiding (urinating, waiting a moment, and trying again), bladder training, and managing constipation. Symptoms can stay stable for years in some men.

Medications

The two main families of drugs used for BPH are:

• Alpha-blockers (such as tamsulosin, alfuzosin, silodosin) — relax the muscle in the prostate and bladder neck, easing flow within days or weeks. Side effects can include dizziness, low blood pressure, and ejaculation changes.
• 5-alpha reductase inhibitors (finasteride, dutasteride) — gradually shrink the prostate over months. Possible side effects include reduced libido, erectile difficulties, and ejaculation changes.

The two are sometimes combined. A newer class, phosphodiesterase-5 inhibitors (tadalafil), is also used in some men with both BPH symptoms and erectile dysfunction.

Minimally invasive treatments other than PAE

• Transurethral microwave therapy (TUMT) and transurethral needle ablation (TUNA) — older heat-based treatments delivered through the urethra.
• Prostatic urethral lift (commonly known by the brand name UroLift) — small implants that hold the prostate tissue away from the urethra.
• Water vapour thermal therapy (Rezūm) — steam is injected into the prostate to destroy tissue, which the body then reabsorbs.
• Temporary implanted nitinol device (iTind) — a small device placed for a few days to reshape the prostatic urethra.

Availability of these techniques varies by hospital and country.

Surgical treatments

• Transurethral resection of the prostate (TURP) — long considered the standard surgical treatment. Prostate tissue is cut away through a scope passed into the urethra.
• Laser treatments — including holmium laser enucleation (HoLEP) and greenlight (photoselective vaporisation), which use laser energy to remove or vaporise prostate tissue.
• Open or robotic simple prostatectomy — used for very large prostates, where the inner part of the gland is removed through an incision or with robotic assistance.

Major urology bodies, including the American Urological Association (AUA) and the European Association of Urology (EAU), provide detailed treatment algorithms that take account of prostate size, symptom severity, sexual function priorities, and overall health. PAE has been incorporated into these guidelines as an option for selected patients, typically alongside the other minimally invasive treatments. NICE in the United Kingdom has also issued interventional procedures guidance on PAE for BPH. Which option fits any particular man depends on these factors and on the experience of the team treating him.

How PAE Compares to TURP and Other Approaches

Patients often want to understand, in plain terms, how PAE stacks up against the more traditional surgical treatment, TURP. Comparison studies and clinical trials have looked at this question.

In general, the patterns reported in the literature are:

• TURP and laser enucleation tend to produce slightly greater improvements in urinary flow rate, because tissue is physically removed.
• PAE tends to produce comparable improvements in symptom scores and quality of life, particularly in the first one to two years.
• PAE has a lower rate of certain complications — particularly retrograde ejaculation, urinary incontinence, and bleeding requiring transfusion.
• PAE has a shorter hospital stay and a faster return to normal activity for most men.
• Some men who have PAE may need an additional treatment later — either repeat PAE, medication, or surgery — if symptoms return.

None of this makes one option universally better than another. It means there is a real trade-off between maximum urinary flow improvement on one side and a less invasive procedure with a different side effect profile on the other. Major societies recommend that men be offered a discussion of the full range of options so that this trade-off can be made consciously.

Preparing for PAE

Before PAE, the team will usually want to confirm three things: that BPH is genuinely causing the symptoms, that the prostate's blood supply can be safely reached, and that you are fit for the procedure.

Tests you may have

• Symptom score — the IPSS questionnaire, which gives a numeric score to your symptoms and their impact.
• Digital rectal examination — the doctor feels the prostate through the rectal wall.
• Urine flow test (uroflowmetry) — you urinate into a special toilet that measures flow rate.
• Post-void residual — an ultrasound after urination to measure how much urine remains in the bladder.
• PSA blood test — to help screen for prostate cancer and give an idea of prostate size.
• Ultrasound or MRI of the prostate — to measure size and look at the shape of the gland. MRI is increasingly used before PAE because it shows the prostate in detail.
• CT angiography — a scan that maps the pelvic arteries to help the interventional radiologist plan the route to the prostate arteries.
• Urodynamics — in some men, a more detailed test of bladder function.
• Cystoscopy — a thin camera passed into the urethra and bladder, in selected cases.

Medication review

You will be asked about all the medicines and supplements you take. Particular attention is paid to:

• Blood thinners — aspirin, clopidogrel, warfarin, apixaban, rivaroxaban, dabigatran. Your doctor will tell you which to stop, which to continue, and for how long. Do not stop these on your own.
• Diabetes medications, particularly metformin, which is sometimes paused around procedures that use contrast dye.
• Blood pressure tablets, usually continued.
• Herbal supplements that can increase bleeding risk.

Day-before instructions

Typical instructions include fasting for several hours before the procedure, drinking clear fluids until a set time, taking your prescribed pre-procedure medications with a sip of water, and arranging for someone to take you home afterwards. You may be given antibiotics to start before the procedure to reduce the risk of urinary tract infection. Some teams ask you to give a urine sample before the procedure to confirm there is no infection. Many men have a urinary catheter placed temporarily during or just after the procedure; this is usually short-term.

What Happens During PAE

1. Positioning and preparation. You lie on your back on the procedure table. The access site — the wrist (radial artery) or the groin (femoral artery) — is cleaned and numbed with local anaesthetic.
2. Access. The interventional radiologist makes a small puncture in the artery and inserts a short tube called a sheath. Through this sheath, a thin catheter is passed into the artery.
3. Mapping the arteries. Iodinated contrast dye is injected, and X-ray pictures (angiograms) are taken to find the prostate arteries on each side. These arteries are small and the anatomy varies between men, so this part of the procedure can take time. Three-dimensional rotational imaging or fusion with a prior CT scan is often used to help.
4. Reaching the prostate artery. A finer catheter, called a microcatheter, is steered into one of the prostate arteries. The radiologist confirms the position with more contrast injections.
5. Embolization. Tiny particles (embolic microspheres, usually between 100 and 500 micrometres — smaller than a grain of sand) are slowly injected through the microcatheter. They lodge in the small vessels of the prostate and block blood flow.
6. The other side. The catheter is then steered to the prostate artery on the opposite side and the process is repeated. Treating both sides is important for the best result.
7. Removing the catheter. Once embolization is complete, the catheter and sheath are removed. Pressure is applied to the puncture site, or a closure device is used, to stop any bleeding.

The whole procedure usually takes between one and three hours, depending on the complexity of the anatomy. You may feel some warmth or mild discomfort during contrast injection, and a dull ache in the pelvis as the embolization is performed. Sharp pain is not expected; tell the team if you feel it.

Recovery and Healing

Most men go home the same day or after one night in hospital. Recovery from PAE happens in two overlapping phases: the immediate recovery from the procedure itself, and the slower recovery as the prostate responds to the loss of blood supply.

The first few hours and the access site

If the wrist was used, you can usually sit up and walk soon after the procedure. A small band is kept on the wrist for a few hours. If the groin was used, you will be asked to lie flat with the leg straight for a few hours to let the puncture seal.

You may have a small bruise at the puncture site. A growing or pulsing lump, severe pain, numbness, or a cold limb is not expected and should be reported promptly.

Post-embolization syndrome

It is normal to feel unwell for a few days after PAE. The cluster of symptoms doctors call “post-embolization syndrome” can include:

• Pelvic, lower abdominal, or rectal discomfort
• A burning feeling on urinating
• Blood in the urine, semen, or stool for a short time
• Frequent urination, urgency, or temporary worsening of symptoms before they improve
• Mild fever
• Tiredness
• Nausea

These symptoms usually peak in the first few days and settle within one to two weeks. Pain relief, anti-inflammatory medication, and sometimes a short course of antibiotics are commonly used. A temporary urinary catheter is sometimes needed if there is swelling that makes urination difficult immediately after the procedure.

Returning to normal activity

Most men return to light activities and desk-based work within a few days. Heavy lifting, vigorous exercise, and long-distance travel are usually avoided for one to two weeks. Driving can usually resume after a few days, depending on comfort and the access site used.

When symptoms improve

Unlike surgery, PAE does not produce instant relief. The prostate needs time to respond. Most men notice gradual improvement starting in the first two to four weeks. Further improvement continues over three to six months, and the full benefit is usually clear by around six months. Urinary stream tends to become stronger, night-time urination less frequent, and the sense of urgency to ease.

Risks and Complications

PAE is considered a low-risk procedure when performed by an experienced interventional radiologist, but no procedure is risk-free. The main risks and complications include:

Common and usually self-limiting

• Pelvic pain or discomfort for a few days
• Temporary burning on urination
• Blood in urine, semen, or stool for a short period
• Bruising at the puncture site
• Temporary worsening of urinary symptoms or urinary retention requiring a short-term catheter
• Urinary tract infection
• Mild fever and tiredness

Less common

• Allergic reaction to the contrast dye
• Temporary reduction in kidney function from the contrast dye, particularly in men with pre-existing kidney disease
• Bleeding or formation of a small false aneurysm at the puncture site
• Persistent urinary symptoms despite the procedure

Rare but serious

• Non-target embolization — particles travelling into arteries supplying nearby structures, such as the bladder, rectum, or penis, leading to ulceration, pain, or, very rarely, sexual dysfunction. Careful angiographic technique, including the use of detailed mapping and small particle sizes, is used to minimise this risk.
• Serious infection requiring hospital treatment
• Significant bleeding requiring transfusion
• Damage to an artery requiring further intervention

Sexual function

One of the main reasons men consider PAE is the lower risk of certain sexual side effects compared with surgery. Studies suggest that retrograde ejaculation is much less common after PAE than after TURP. Erectile function is usually preserved and, in some men, may even improve as overall urinary quality of life improves. However, sexual side effects are still possible, and your doctor should discuss your individual risk based on your baseline function and anatomy.

The chance of needing another treatment

A proportion of men who have PAE will need a further treatment within a few years — this could be repeat PAE, restarting medication, or moving to a surgical option. The likelihood depends on many factors, including the size and shape of the prostate, the technical success of the embolization on both sides, and the underlying cause of the symptoms. Your interventional radiologist can give you a better estimate based on your individual case.

Life After PAE

Most men who have a successful PAE experience meaningful improvement in their urinary symptoms and quality of life. The picture over the longer term tends to look like this:

The first six months

Urinary symptoms gradually improve. The prostate becomes smaller on imaging. Medications for BPH can often be reduced or stopped, but only under the guidance of your doctor. Follow-up usually includes a clinic visit, a repeat symptom score, and sometimes a repeat ultrasound or MRI.

Beyond six months

Most of the improvement gained from PAE is maintained for several years. Some men continue to do well long-term without further treatment. Others find that symptoms slowly return over time, particularly if the prostate continues to grow. If that happens, the options are the same as before: lifestyle measures, medication, repeat PAE, or surgery. Having had PAE does not prevent any of the other treatments later.

Sexual life

Sexual activity can usually resume within one to two weeks, guided by comfort. Blood in the semen for a few weeks is common and not a cause for alarm on its own. Most men retain their ability to ejaculate normally.

Ongoing prostate health

PAE treats the symptoms of an enlarged prostate. It does not treat prostate cancer, nor does it replace prostate cancer screening if your doctor advises it. PSA testing and any other screening should continue as recommended for your age and risk profile. PSA levels usually drop after PAE because the prostate is smaller; your doctor will interpret the new baseline.

Choosing a Centre and an Operator

PAE is technically demanding. The prostate arteries are small and their anatomy varies a great deal from person to person. Outcomes are strongly linked to the experience of the interventional radiologist and the support of a multidisciplinary team that includes a urologist.

Things that are reasonable to ask or look for include:

• How often the interventional radiologist performs PAE
• Whether the hospital has modern angiography equipment, including cone-beam CT or three-dimensional rotational imaging, which help find the prostate arteries safely
• Whether there is a joint urology and interventional radiology pathway, so that pre-procedure assessment and follow-up are well coordinated
• What the plan would be if PAE on one side is not technically possible
• How complications are handled if they occur

Frequently Asked Questions

Is PAE painful?

The procedure itself is not usually painful. You may feel some warmth from the contrast dye and a dull ache in the pelvis when the particles are injected. Sedation is given to keep you relaxed. In the days after PAE, pelvic discomfort and a burning sensation on urination are common but usually settle with simple pain relief.

How long will I be in hospital?

Many men go home the same day. Some stay one night for observation, particularly if a urinary catheter has been placed or if there is significant discomfort.

Will PAE affect my ability to have children?

PAE is performed in men whose family planning is usually complete, but fertility is not the goal of the procedure. The effect of PAE on fertility has not been studied in detail. If fertility matters to you, discuss this with your doctor before the procedure.

Will I still be able to ejaculate normally?

One of the main attractions of PAE for many men is that retrograde ejaculation — semen flowing backward into the bladder — is much less common after PAE than after TURP. Most men continue to ejaculate normally. Some changes in ejaculate volume can occur.

Will I need to keep taking my BPH medication?

Many men can reduce or stop their BPH medications after a successful PAE. The timing depends on how your symptoms respond. This is a decision to make with your doctor, not on your own.

How soon will I see improvement?

Some men notice changes within the first two weeks, but the typical pattern is gradual improvement over three to six months. PAE does not produce instant relief.

Can PAE be repeated?

Yes. If symptoms return after some years, repeat PAE is sometimes possible. Other treatments, including medication and surgery, also remain available.

Does PAE treat or prevent prostate cancer?

No. PAE is a treatment for the symptoms of an enlarged prostate. It does not treat prostate cancer and it does not replace prostate cancer screening. Continue with PSA testing and any other screening your doctor advises.

What if the radiologist cannot find or reach the prostate artery on one side?

Anatomy varies, and sometimes the prostate artery on one side cannot be safely treated. Treating one side alone gives less benefit than treating both, but in some men it still helps. Your interventional radiologist will discuss the findings and the next steps if this happens.

How does PAE compare to UroLift, Rezūm, or laser surgery?

Each of these treatments has a different mechanism and a different profile of benefits, side effects, and recovery. PAE works through the blood supply and is suitable for a wide range of prostate sizes, including very large prostates. UroLift uses implants to hold the prostate open and tends to suit smaller prostates with a specific shape. Rezūm uses steam to destroy tissue. Laser surgery, including HoLEP, removes tissue and tends to give the strongest improvement in flow. A discussion with both a urologist and an interventional radiologist is the usual way to weigh these options.

Conclusion

Prostate artery embolization is a minimally invasive option for men with bothersome symptoms from an enlarged prostate. It works differently from surgery — by reducing the prostate's blood supply rather than removing tissue — and that difference shapes both its strengths and its limits. For many men, PAE offers meaningful relief from urinary symptoms with a short recovery, a low risk of sexual side effects, and no need for general anaesthesia. For others, surgery or another minimally invasive treatment may be a better fit.

The decision is rarely a simple one. Prostate size and shape, bladder function, overall health, sexual priorities, and personal preference all come into it. Major urology and interventional radiology societies recommend that men be offered a full discussion of the options, including PAE where it is available, before settling on a path. With clear information and an experienced team, that conversation becomes much easier.