Patent Foramen Ovale

Patent foramen ovale is a small opening between the upper chambers of the heart that normally closes after birth in most people. In some individuals it remains partially open. In many cases it causes no symptoms and is discovered incidentally, but in selected situations it becomes clinically relevant because of its possible relationship to stroke or other embolic events. ^[1][2]

What is a PFO and how important is it?

Before birth, the foramen ovale is a normal fetal passage that helps blood bypass the lungs. After birth it usually functionally closes. When it remains patent, this is called a patent foramen ovale. A PFO is common in the general population and does not automatically mean heart disease in the usual sense. ^[1][2]

Its importance depends on context. Many people live their entire lives without knowing they have a PFO and never experience any problem from it. In others—particularly in the evaluation of cryptogenic stroke—the presence of a PFO may prompt more detailed assessment. ^[2][3]

Are there symptoms?

Most people with a PFO do not have specific symptoms. That is why the finding is often incidental during echocardiography performed for another reason. In some cases it enters the discussion after an unexplained stroke, transient ischemic attack, or certain other embolic events. ^[1][2]

Some people ask whether migraine, dizziness, or palpitations are directly caused by a PFO. The answer is not straightforward; having a PFO does not automatically make it the explanation for every symptom. The entire clinical picture must be evaluated together. ^[2][3]

How is the diagnosis made?

Diagnosis is most often made with echocardiography, sometimes supported by contrast (“bubble”) study. Transesophageal echocardiography may provide more detailed information in selected cases. The aim is to assess not only whether a PFO exists but also its size, the direction of shunting, and whether other cardiac abnormalities are present. ^[1][2]

A PFO discovered after stroke evaluation should not be interpreted in isolation. Other causes of stroke—such as rhythm disorders, vascular disease, clotting disorders, or arterial problems—must also be investigated before assuming the PFO is the culprit. ^[2][3]

Is treatment necessary?

Not every PFO requires treatment. In many asymptomatic people, no intervention is needed. Treatment decisions become more relevant in patients with cryptogenic ischemic stroke and carefully selected risk profiles. In such cases, medical therapy and, in some situations, catheter-based PFO closure may be discussed. ^[1][2]

The decision is individualized. Age, stroke characteristics, the exclusion of alternative causes, anatomic features of the PFO, and patient preference all play a role. The presence of a PFO alone is not sufficient reason for closure in every case. ^[2][3]

Daily life and follow-up

Hearing that there is a “hole in the heart” may sound alarming, but many PFOs are incidental and do not disrupt everyday life. The main issue is whether the finding has real clinical significance in that particular person. This is why follow-up planning should be based on the reason the PFO was discovered. ^[1][2]

After an unexplained stroke or TIA, a more detailed neurologic and cardiologic evaluation becomes central. In patients treated medically or with closure, follow-up focuses on preventing recurrent events and monitoring overall cardiovascular health. ^[2][3]

Living with a PFO: which situations truly matter?

The most important question is not simply “Is there a PFO?” but “Does it explain the event we are trying to understand?” That distinction prevents both over-treatment and false reassurance. A PFO found incidentally in a healthy person is different from a PFO identified after embolic stroke workup. ^[2][3]

Sudden weakness, speech difficulty, vision loss, chest pain, or shortness of breath require urgent evaluation, but these symptoms should not automatically be attributed to a known PFO without proper medical assessment. ^[1][2]

Additional points to consider in follow-up

Not every clinician will recommend the same path, because treatment decisions depend heavily on the details of the case. This can be confusing for patients, but it reflects the fact that the clinical significance of a PFO is highly individualized. Shared decision-making is therefore important. ^[2][3]

Additional clinical notes

PFO may coexist with other findings such as atrial septal aneurysm, and those details can influence interpretation. For that reason, a specialist review of the echocardiographic report matters more than the single phrase “PFO present.” ^[2][3]

This content does not replace diagnosis. Especially after stroke, TIA, or unexplained embolic events, specialist evaluation should not be delayed.

FAQ

Does every PFO require closure?
No. Many PFOs do not require any intervention. Closure is considered only in selected situations. ^[1][2]

Can a PFO cause stroke?
In some carefully selected cases, it may be associated with cryptogenic stroke, but not every stroke in a person with PFO is caused by the PFO. ^[2][3]

Do most people with PFO have symptoms?
No. Most people have no specific symptoms. ^[1][2]

Is a PFO the same as congenital heart disease?
It is a structural cardiac finding present from fetal life, but it is not interpreted the same way as major congenital heart defects in every patient. ^[1][2]

When should urgent evaluation be sought?
Sudden neurologic deficits, chest pain, severe shortness of breath, or vision loss require urgent medical assessment. ^[1][2]