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Scatterplot showing the association between the left atrial anteroposterior diameter normalized to body weight (LADn) and left atrial-to-aortic root ratio (LA/Ao) in dogs with myxomatous mitral valve disease. A linear positive correlation was found between LADn and LA/Ao (r=0.87; P<0.001). The lines represent the threshold for identification of left atrial enlargement based on LA/Ao (1.6) and LADn (15.72).
