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Figure 2 Stop-frame two-dimensional parasternal long-axis view (A), M-mode echocardiogram (B), and four-chamber (C) view from a 26-year-old elite rower, showing left atrial enlargement (transverse dimension = 45 mm). The left atrium is globally enlarged in both the transverse and longitudinal dimensions; left and right ventricular and right atrial chambers are also enlarged. AO = aortic root; LA = left atrium; LV = left ventricle; RA = right atrium; RV = right ventricle.