Right atrial pressure from IVC
Right atrial pressure estimated from IVC diameter and its inspiratory collapse.
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RAP ≈ 3 mmHg
Used as the offset in PASP and other right-heart pressures
Worked steps
IVC-based estimate
RAP = 3 mmHg
Reference: ASE/EACVI chamber quantification (2015): IVC ≤2.1 cm collapsing >50% → 3 mmHg; >2.1 cm collapsing <50% → 15 mmHg; discordant → 8 mmHg. Verify at review.
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