What is the most common type of atrial septal defect (ASD)?

Study for the CCI Echocardiography Test. Prepare with flashcards and multiple choice questions, each with hints and explanations. Get ready for your exam!

Secundum atrial septal defect is the most prevalent form of ASD, accounting for about 70-80% of cases. This type of defect arises from an inadequate formation of the septum secundum, which leads to the presence of a foramen ovale that does not close properly after birth. As a result, blood can flow from the left atrium to the right atrium, resulting in increased volume overload of the right side of the heart.

Secundum ASDs can vary in size and are often diagnosed during childhood or early adulthood through echocardiographic imaging. Many individuals with a secundum ASD may remain asymptomatic for years, allowing for a broader understanding and better identification of the condition during routine heart evaluations.

In this context, the other types of ASDs are less common. Primum ASDs occur less frequently and are typically associated with endocardial cushion defects. Sinus venosus ASDs, which involve defects near the entrance of the superior vena cava, and coronary sinus ASDs, which are very rare defects located near the coronary sinus, also have lower incidence rates compared to secundum ASDs. Understanding the relative prevalence is crucial for diagnosing and managing these defects effectively.

Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy