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Figure 4 The mitral valve area (MVA) estimated using pressure half-time approach: comparison of velocity-encoded cardiovascular magnetic resonance (CMR) results to echocardiography. (a) MVAs obtained by CMR correlated well with those by ultrasound. (b) Bland-Altman plot of the mean difference and 2 standard deviation (SD) limits of MVA estimated by both methods. Triangles = patients with AI; other abbreviations as in Figure 3.
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