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An atrial septal defect (ASD) is a congenital heart defect characterized by an abnormal opening in the atrial septum.
There are several types of atrial septal defects (ASDs), including:
1. Secundum ASD: This is the most common type of ASD, accounting for about 70-80% of all ASDs. It occurs in the middle portion of the atrial septum.
2. Primum ASD: This type of ASD is less common and is typically associated with other congenital heart defects, such as an abnormal mitral valve. It is located in the lower part of the atrial septum.
3. Sinus Venosus ASD: This type of ASD is located near the superior vena cava, which is the large vein that carries deoxygenated blood from the upper body to the right atrium of the heart. It is associated with abnormalities in the connection between the pulmonary veins and the right atrium.
4. Coronary Sinus ASD: This is a rare type of ASD that involves an opening in the wall between the coronary sinus, which is a vein that drains blood from the heart muscle, and the left atrium.
5. Mixed ASD: In some cases, individuals may have a combination of different types of ASDs, such as a secundum and primum ASD occurring together.
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