Background: Our purpose was to find the useful predictive factor for right atrial pressure (RAP),
in several parameters of inferior vena cava (IVC) in 2-dimensional echocardiography.
Methods: Thirty two patients who underwent right heart catheterization and echocardiography
were enrolled. Maximum and minimum diameters in long-axis images, and short diameter,
long diameter, area, and sphericity index in short-axis were measured. We evaluated
the association between RAP and each index. Results: Among several indices, sphericity index of IVC showed the largest area under the
ROC to detect RAP > 8 mmHg (AUC = 0.738). When a cutoff value of 0.54 for sphericity
index of IVC was used, the sensitivity and specificity were 78% and 79% (Figure).
Conclusion: Sphericity index could be a useful parameter to predict high RAP in several IVC parameters.
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