Types of Inter Atrial Septal (IAS) Aneurysm seen on Echocardiography

Apical four chamber view of echocardiogram showing Atrial Septal Aneurysm bowing into left and right atria like a swing. As its movement is bi directional, its type 5.

Classification of Inter atrial Aneurysm:

type 1R: bulging is in the right atrium only

type 2L: bulging is in the left atrium only

type 3RL: major excursion bulges to the right atrium and the lesser excursion bulges toward the left

type 4LR: maximal excursion of the atrial septal aneurysm is toward the left atrium with a lesser excursion toward the right atrium

type 5: atrial septal aneurysm movement is bidirectional and equidistant to both atria during the cardiorespiratory cycle.

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