atrial septal defect

An atrial septal defect (ASD) is a heart condition where there is a hole in the wall (septum) that separates the two upper chambers of the heart, called the atria. This defect allows oxygen-rich blood from the left atrium to mix with oxygen-poor blood in the right atrium, potentially leading to increased blood flow to the lungs and heart. Symptoms can vary; some people may not notice any issues, while others may experience fatigue or shortness of breath. Treatment can include monitoring, medication, or surgery to close the hole, depending on its size and the symptoms presented.