EchoBridgeMD Pearl #30: Estimating Right Atrial Pressure from the IVC
The American Society of Echocardiography recommends integrating inferior vena cava (IVC) diameter and inspiratory collapse to estimate right atrial pressure (RAP):
• Normal RAP ≈ 3 mmHg (range 0–5): IVC ≤2.1 cm with >50% collapse during a sniff.
• Intermediate RAP ≈ 8 mmHg (range 5–10): IVC diameter and inspiratory collapse do not fit either the normal or elevated RAP pattern.
• Elevated RAP ≈ 15 mmHg (range 10–20): IVC >2.1 cm with <50% collapse during a sniff.
At the bedside, estimated RAP provides insight into right-sided filling pressures. A small, collapsible IVC may support low filling pressures, whereas a dilated, poorly collapsible IVC may support elevated right-sided pressures and systemic venous congestion.
Importantly, IVC findings should be integrated with the clinical examination and the rest of the echocardiogram rather than interpreted in isolation as a measure of volume status.
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📖 Rudski LG, Lai WW, Afilalo J, et al. Guidelines for the echocardiographic assessment of the right heart in adults: a report from the American Society of Echocardiography endorsed by the European Association of Echocardiography, a registered branch of the European Society of Cardiology, and the Canadian Society of Echocardiography. J Am Soc Echocardiogr. 2010.
📖 Beigel R, Cercek B, Luo H, Siegel RJ. Noninvasive evaluation of right atrial pressure. J Am Soc Echocardiogr. 2013.
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