Echopedia

Right Atrium

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Right atrial dimensions

 
2D measurement AP4CH
RA length <53mm
RA cross <44mm
RA end-systolic area <18cm2

Right atrial pressure (RAP)

Inferior Vena Cava Diameter Estimation RAP
Normal <15mm 5mmHg
Borderline 15-20mm 5-10 mmHg
Dilated,> 50% collapse 10-15 mmHg
Dilated, <than 50% collapse 15 - 20 mm Hg

References

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