Q. What is the most common atrial septal defect?

Doctor Answer is medically reviewed by SecondMedic medical review team.

Answered by Secondmedic Expert

The most common type of atrial septal defect (ASD) is a secundum ASD, which affects the middle portion of the wall between the two upper chambers of the heart. It accounts for 80-90% of all ASDs and typically occurs in individuals between 10-30 years old. A secundum ASD is also more likely to be seen in females than males, but it can occur in either sex.

Secundum ASDs involve an opening located below or above the valve separating left and right atria. This defect can cause oxygenated blood to flow back into lungs since it's not enough pressure to push blood through one side of the heart into another. Common symptoms associated with this defect include shortness of breath, fatigue and difficulty exercising due to reduced oxygen levels throughout body tissues, palpitations or chest pain when physical activity takes place, swelling in legs as well as frequent respiratory infections due to higher risk for bacteria entering bloodstream from airways.

If detected early, secundum ASD can often be repaired surgically before further damage occurs. However if left untreated it can lead to complications such as pulmonary hypertension or infective endocarditis (heart infection). There are also several tests which may be used diagnose this condition including echocardiography, electrocardiogram (ECG), cardiac catheterization or MRI scan. Consulting a cardiologist will help provide treatment plan that best suits your needs and reduce any potential risks associated with having an undetected/untreated ASD going foward.

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