Which ultrasound view provides the most perpendicular angle to the interatrial septum?

The subcostal four-chamber view is critical for visualizing the interatrial septum at an optimal angle. This view is obtained by placing the transducer beneath the rib cage in the subcostal region and angling it upwards towards the heart. By doing so, it aligns the ultrasound beam perpendicular to the interatrial septum, allowing for a clear visualization of structures such as the atria, ventricles, and potential abnormalities like atrial septal defects.

This perpendicular alignment is essential because it maximizes the likelihood of capturing accurate measurements and assessing any pathologies affecting the septum, since variations in angle can distort image quality and obscure important details. Other views, while useful for different assessments, do not achieve this perpendicular alignment to the interatrial septum as effectively as the subcostal four-chamber view.