How is an interatrial or atrial septal defect suggested on Doppler imaging?

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How is an interatrial or atrial septal defect suggested on Doppler imaging?

The key idea is that an interatrial or atrial septal defect is suggested when a color Doppler jet is seen crossing the atrial septum, indicating a shunt between the atria. This visualization provides direct evidence of communication through the septum, which is what defines an ASD. Without color flow crossing the septum, you wouldn’t have confirmation of a defect; merely seeing no flow or only diastolic flow across the septum doesn’t reliably indicate an ASD, and relying on no color Doppler at all would miss the shunt. In practice, small or difficult-to-imagine defects may require multiple views, but the defining sign is the presence of a color flow jet traversing the septum.

The key idea is that an interatrial or atrial septal defect is suggested when a color Doppler jet is seen crossing the atrial septum, indicating a shunt between the atria. This visualization provides direct evidence of communication through the septum, which is what defines an ASD. Without color flow crossing the septum, you wouldn’t have confirmation of a defect; merely seeing no flow or only diastolic flow across the septum doesn’t reliably indicate an ASD, and relying on no color Doppler at all would miss the shunt. In practice, small or difficult-to-imagine defects may require multiple views, but the defining sign is the presence of a color flow jet traversing the septum.

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