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What are the types of atrial septal defect (ASD) ?

What are the types of atrial septal defect (ASD) ? 

• Ostium secundum detect accounts for 70% of the cases. The defect is in the middle portion of the atrial septum and is usually 24 cm in diameter (incomplete right bundle branch block pattern, QRS axis rightward).

• Sinus venosus type is a defect in the septum just below the entrance of the superior vena cava into the right atrium (leftward P wave axis so that P waves are inverted in at least one inferior lead).

• Ostium primum type is a defect in the lower part of the septum, and clefts may occur in the mitral and tricuspid valves (QRS axis leftward). A junctional or low atrial rhythm (inverted P waves in the inferior leads) occurs with sinus venosus defects.
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What are the types of atrial septal defect (ASD) ? 

• Ostium secundum detect accounts for 70% of the cases. The defect is in the middle portion of the atrial septum and is usually 24 cm in diameter (incomplete right bundle branch block pattern, QRS axis rightward).

• Sinus venosus type is a defect in the septum just below the entrance of the superior vena cava into the right atrium (leftward P wave axis so that P waves are inverted in at least one inferior lead).

• Ostium primum type is a defect in the lower part of the septum, and clefts may occur in the mitral and tricuspid valves (QRS axis leftward). A junctional or low atrial rhythm (inverted P waves in the inferior leads) occurs with sinus venosus defects.
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