If the foramen ovale doesn't close at birth,the result will be

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The foramen ovale is a hole between the atria in the fetal heart that allows oxygenated blood to bypass the non-functioning fetal lungs and enter the systemic circulation. After birth, when the lungs begin to function, the pressure in the left atrium increases, forcing the septum primum against the septum secundum, effectively closing the foramen ovale. If the foramen ovale doesn't close, deoxygenated blood from the right atrium may flow into the left atrium and then into the systemic circulation, leading to a condition called a "patent foramen ovale." This can result in a reduction of oxygen supply to the body's tissues and organs and an increased risk of stroke or heart failure.

If the Foramen Ovale Doesn't Close at Birth,the Result Will