EDに対する陰茎ドップラー超音波検査：命を救う検査か、時間の無駄か？

最終更新日： 2026年8月15日

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Imagine a packed ballroom full of the world’s top urologists, the air buzzing with tension — not for a surgery, but for a debate. The topic? Whether a particular ultrasound test of the penis is, as the session was cheekily titled, the best thing since sliced bread — or a complete waste of time.

I had the privilege of witnessing this academic showdown firsthand at the 米国泌尿器科学会（AUA）2026年総会 ワシントンD.C.で、見学している最中に モーヒット・ケラ教授, a world-renowned expert in men’s health. The test in question is the penile duplex ultrasound (PDU) — a scan that measures blood flow inside the penis. Two brilliant experts went head-to-head: one defending it as a potentially life-saving window into a man’s heart health, the other dismantling it as clunky, unreliable, and often pointless. Here’s what this fascinating debate can teach all of us about modern men’s health.

First, What Is a Penile Doppler Ultrasound?

For years, doctors assessed erectile dysfunction (ED) mainly through questionnaires — helpful, but they cannot see what is happening inside the blood vessels. A penile duplex ultrasound goes deeper: after a small injection of medication that relaxes the blood vessels and produces an erection, an ultrasound probe measures how well blood flows into, and stays inside, the penis. In theory, this reveals whether ED is caused by a blood-flow problem — and that is where the disagreement begins.

Who Actually Does What During the Test

Worth being precise about this, because patients often assume one person does everything. At Bangkok Hospital Headquarters the penile duplex study is a team assessment. As the urologist, I give the intracavernosal injection, decide whether a further dose is needed during the study, and interpret the findings alongside the rest of the clinical picture. The ultrasound imaging itself is performed by a radiologist. That division of labour is a strength rather than a limitation — the quality of the scan depends heavily on the person holding the probe, which is exactly the weakness the debate below turns on. Penile colour Doppler assessment was part of my andrology fellowship at Chang Gung Memorial Hospital, Kaohsiung, in 2019, under Prof. Po-Hui Chiang, which is where I learned both how to read these studies and how easily they can mislead.

One safety point that belongs here rather than buried at the end. The injection used to produce the erection is the same class of medication used to treat ED by injection, and it carries the same risk: an erection that does not go down. If an erection lasts longer than four hours, that is priapism and it is an emergency — not something to sleep on and mention at the next appointment. Blood trapped in the penis loses its oxygen supply, and damage to erectile tissue can follow. You will be observed after the study until the erection settles, and told exactly whom to contact; if you are already home and it has not settled, go to an emergency department and say that you had an intracavernosal injection and when.

The Pro Side: A Window Into the Heart

The first expert made a bold case: a penile ultrasound is not just about sexual function — it can be an early warning system for a man’s entire cardiovascular system.

Planning Better Surgery for Peyronie’s Disease

The pro side pointed out that erectile dysfunction and ペイロニー病 (curvature of the penis caused by scar tissue) often go hand in hand. A large share of Peyronie’s patients also have a hidden blood-flow problem — most commonly a venous leak, where blood drains out of the penis too quickly to maintain an erection.

Why does this matter? Because surgery to straighten a curved penis will not help if there is an undetected venous leak. The patient could end up perfectly straight — but unable to get an erection. By spotting these hidden issues 以前 surgery, the ultrasound helps surgeons choose the right approach: a straightening procedure versus going straight to a penile implant.

The Canary in the Coal Mine for Heart Disease

This was the most compelling argument. The blood vessels that supply the penis are tiny — much smaller than the arteries feeding the heart or the brain. Since artery-clogging plaque builds up throughout the whole body, it tends to choke off these tiny penile vessels first, long before it blocks the larger, more critical arteries.

The powerful conclusion: blood-flow-related erectile dysfunction is often the very first warning sign of silent heart disease — sometimes appearing years before a heart attack or stroke. From this angle, the ultrasound is not just a sexual-health test; it is a potential life-saver, allowing doctors to send at-risk men to a cardiologist for early heart screening and prevention before disaster strikes. This is the argument set out at length in why erectile dysfunction is your heart’s early warning system.

The Con Side: Clunky, Unreliable, and Often Pointless?

Just as the audience was ready to declare every man needs this test, the opposing expert delivered a sharp, practical rebuttal.

The Results Can Be All Over the Map

The con side showed that the test is highly dependent on the person performing it. In one striking example, the very same patient gave wildly different readings depending on which side of the penis was measured or the angle of the probe — one side looked borderline abnormal, the other looked perfectly healthy. The pointed question to the room: which result do you believe, and would you really base major surgery on a number that shaky?

Anxiety Can Fake a Disease

To get an accurate reading, the penis needs to be fully relaxed and erect. But picture the setting: a cold clinical room, bright lights, a doctor holding a syringe and a probe. For most men, this is the opposite of relaxing. The resulting rush of adrenaline tightens the blood vessels — exactly what the test is trying to avoid. The result? A perfectly healthy man can be falsely labelled with severe vascular disease, when his only real problem was nerves in the doctor’s office.

Does It Actually Change the Treatment?

This was the heart of the con argument. The expert walked through the common situations and asked, in each case, whether the ultrasound would actually change what the doctor does:

• ED that has not responded to pills: The next steps (vacuum devices, injections, or an implant) are the same regardless of the exact blood-flow numbers.
• Peyronie’s disease: A physical exam and an in-office assessment can map the scar tissue and the curve. Treatment is guided by the degree of the curve, not the ultrasound.
• Priapism (a prolonged, painful erection): A quick blood sample from the penis is the gold-standard test — not an ultrasound. And it is an emergency in its own right: an erection lasting more than four hours needs to be seen immediately, whatever caused it.
• Penile fracture: A sudden bend with an audible crack during intercourse, followed by pain and rapid swelling, is a surgical emergency needing repair the same night. If imaging is truly needed, an MRI is far better than ultrasound.

Even the Experts Cannot Agree on the Numbers

Finally, the con presenter highlighted that there is a surprising lack of large, high-quality studies proving the test improves outcomes. Worse, major medical organisations around the world disagree on the exact cutoff numbers for diagnosing a venous leak. This means a man could be told he has a serious vascular problem in one country, but be considered borderline normal in another — based on the same result. The blunt conclusion: if it does not reliably change outcomes and is not even standardised, is it worth the time and stress?

The Verdict: A Powerful Tool — When Used Wisely

When the debate ended, the room burst into applause. The beauty of it was not a clear winner — it was the balanced middle ground where the best medicine is actually practised. The takeaway, and the philosophy Professor Khera emphasises in his own practice, is this: a penile ultrasound is neither a miracle screening test for everyone nor a complete waste of time. It is a specialised, powerful tool that must be used selectively and interpreted with care.

Here is how thoughtful urologists apply it today:

• Not for everyone — only specific cases: It is best reserved for situations like young men with unexplained ED, ED following an injury where vascular damage is suspected, or severe Peyronie’s patients deciding between complex surgery and an implant.
• Beat the anxiety problem: Doctors should use effective medication and be willing to re-dose during the exam so the test is not ruined by nerves — while watching for the opposite problem, an erection that then refuses to settle.
• Ask the right question: One brilliant clinical tip from the session — simply ask the patient how the erection he has right now compares to his best erection at home. If he says it is only half as good, the doctor knows the numbers are skewed by anxiety and should not be trusted.
• Connect the dots to heart health: If a young, otherwise healthy man genuinely has poor penile blood flow, he should not just get a prescription — he should be referred to a cardiologist for proper heart-risk screening.

In practice, the ultrasound is one step within a broader assessment rather than a standalone answer — which is really another way of saying what I have written before: erectile dysfunction is a symptom, not a disease. You can see where the scan sits in our ED diagnostic pathway, alongside hormonal testing and cardiovascular risk profiling.

Watching world-class clinicians passionately debate something this specific reminded me that medicine is never a static set of rules. Being a great doctor means blending open-mindedness with healthy scepticism — seeing a test’s potential to catch life-threatening heart disease early, while also having the wisdom not to over-test, over-diagnose, or over-stress the patient in front of you.

If you are experiencing erectile dysfunction, penile curvature, or other men’s health concerns and would like a thoughtful, individualised evaluation, Dr. Soarawee Weerasopone consults at バンコク病院本部 そして、 サムティジェイ・シリチャ病院、チョンブリー — 088-022-1445.

バンコク病院の遠隔医療は、来院が困難な患者様（海外からの患者様を含みます）を対象にご利用いただけます。泌尿器科宛てに事前にメールでご手配ください。 bhquro@bdms.co.th. It suits discussing whether this test is worth doing in your case, or reviewing results you already have. The study itself requires an in-person visit. Samitivej Sriracha is in-person only.

お客様からよくいただくご質問

陰茎ドップラー超音波検査は何のために使用されますか？

A penile duplex (Doppler) ultrasound measures blood flow inside the penis to assess whether erectile dysfunction is caused by a blood-flow problem, such as poor arterial inflow or a venous leak. It involves a small injection of medication to produce an erection, followed by an ultrasound scan. It is most useful in specific situations — such as young men with unexplained ED, ED after an injury, or planning surgery for Peyronie’s disease — rather than as a routine test for everyone.

バンコク病院では誰が検査を行いますか？

It is a team assessment. The urologist gives the intracavernosal injection, decides on any further dose during the study, and interprets the findings in context; the ultrasound imaging itself is performed by a radiologist. Because the quality of a duplex scan depends so much on the operator, having it done by someone who scans for a living is an advantage, not a compromise.

この検査で使用される注射は安全ですか？

It is well established, but it is a real medication with real effects. Bruising, aching or a small amount of bleeding at the injection site are common and settle. The important risk is priapism — an erection that does not go down. An erection lasting more than four hours is an emergency: trapped blood loses its oxygen supply and damage to the erectile tissue can follow. You will be observed after the study until the erection settles. If it has not settled once you are home, go to an emergency department and tell them you had an intracavernosal injection and at what time.

勃起不全は心臓病の兆候である可能性がありますか？

はい。ペニスに血液を供給する血管は非常に小さいため、心臓の太い動脈よりも早くプラークによって詰まる可能性があります。その結果、血流に関連する勃起不全（ED）は、多くの場合、無症状の心血管疾患の最初の警告サインの一つとなり、心臓発作や脳卒中の何年も前に現れることがあります。血管性EDの男性は、循環器専門医による心疾患リスクのスクリーニングを受けるとよいでしょう。.

陰茎超音波検査で誤った結果が出ることがあるのはなぜですか？

The test requires the penis to be fully relaxed and erect for an accurate reading. However, the clinical setting often makes men anxious, and the resulting adrenaline tightens the blood vessels — the opposite of what is needed. This can produce a falsely abnormal result, wrongly suggesting vascular disease when the real issue is simply anxiety. This is why an experienced doctor will often re-dose the medication and ask how the erection compares to the patient’s best erection at home.

Does every man with erectile dysfunction need a penile ultrasound?

No. For most men with erectile dysfunction, a penile ultrasound does not change the treatment plan and is not necessary. The test is best reserved for selected cases where the result will genuinely affect decisions — such as young men with unexplained ED, suspected vascular injury after trauma, or surgical planning for severe Peyronie’s disease. A good urologist uses it selectively and interprets the results within the full clinical picture.

免責事項 This content is written and reviewed by Dr. Soarawee Weerasopone, a board-certified urologist at Bangkok Hospital Headquarters. It is intended for educational purposes only and does not constitute medical advice. No advice, diagnosis or prescription is given through personal messaging channels or social media. Always consult a qualified healthcare professional before starting any medical treatment. If an erection lasts more than four hours, seek emergency care immediately rather than waiting for an appointment.