Atrioventricular Septal Defect (AVSD) is a congenital heart condition where there is a hole between the heart's chambers, affecting both the atria and ventricles. This defect leads to improper blood flow, causing the heart to work harder to pump blood. AVSD can result in symptoms like shortness of breath, fatigue, and poor growth in infants. AVSD is often associated with other conditions, such as Down syndrome. Treatment typically involves surgery to repair the heart's structure, allowing for normal blood flow and improving the patient's quality of life. Early diagnosis and intervention are crucial for better outcomes.