Echocardiography results with oval hole size 3mm dangerous?

Question
Hi Doctor,
I have a stress echocardiogram which shows that the foramen ovale is about 3 mm. Please ask the doctor if the echocardiogram has a dangerous 3mm oval hole? Thanks for the advice doctor.
Anonymous customer
Answer
Answered by Master, Doctor Pham Van Hung - Department of Medical Examination & Internal Medicine, Vinmec Danang International General Hospital.
Hello,
With the question "Is the echocardiography result with a 3mm oval hole dangerous? The doctor answered as follows:
The foramen ovale is an existing structure in the heart (connecting the right and left atrium) from the fetus, it allows blood to pass through the lungs of the fetus. When the baby is born with the first breath, the foramen ovale will close, after 6 months to 1 year, about 75% of babies have completely closed. If it hasn't closed yet, it's called an oval hole. Most cases of foramen ovale are asymptomatic and cause no complications. However, you should see a cardiologist or neurologist when you have symptoms of atrial fibrillation, migraine or stroke for further examination and advice on prevention and treatment.
If you still have questions about the results of echocardiography with a 3mm oval hole, you can go to a medical facility under Vinmec Health System for early examination and treatment. Thank you for trusting and sending questions to Vinmec. Wishing you lots of health.
Best regards!