Is it serious that the foramen ovale is not closed completely?

Foramen

ovale is a physiological pathway through which the atrial septum forms during fetal development. Normally, the foramen ovale begins to fuse around 2 months after birth, so for most newborns with incomplete foramen ovale, the phenomenon is generally not serious and does not lead to shunt performance or small blood shunt volume in the heart. However, if the foramen ovale does not heal after 1 year of birth, and causes abnormal shunt of heart blood, it may cause hypoxemia, dyspnea and other symptoms, which is relatively serious and may cause serious harm to health.