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Figure 1 Echocardiographic measurement of RA dimensions at end systole. A ${leftrightarrow}$ B = maximal mediolateral dimension (i.e., width of RA); C ${leftrightarrow}$ D = superoinferior dimension (i.e., length of RA); LA = left atrium; LV = left ventricle; RA = right atrium; RV = right ventricle.

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