Which chamber was mildly dilated on the echo?

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Dilation on an echocardiogram reflects a chamber that has been chronically subjected to increased load. The left atrium tends to enlarge when the left heart experiences sustained elevated filling pressures or volume overload, such as from diastolic dysfunction, mitral valve disease, or long-standing hypertension. In contrast, the left ventricle usually enlarges with systolic heart failure, the right ventricle with pulmonary hypertension or right-sided problems, and the aorta isn’t a cardiac chamber that’s described as mildly dilated in this context. Therefore, a finding of mild dilation most consistently points to the left atrium being the chamber affected, representing early remodeling from chronic left-sided loading.