There are several types of ASD, classified based on their location in the septum:
Secundum ASD: The most common type, located in the central part of the atrial septum. Primum ASD: Located near the lower part of the atrial septum, often associated with other congenital heart defects. Sinus Venosus ASD: Found near the junction of the superior or inferior vena cava and the right atrium. Coronary Sinus ASD: A rare type involving the coronary sinus and the left atrium.
