The extent of left ventricular (LV) diastolic dysfunction is related to the finding that some patients with cardiomegaly due to LV systolic dysfunction have good exercise tolerance, although others have limited tolerance. A brain-type natriuretic peptide level of >/=104 pg/ml reliably enables the detection of relatively worse LV diastolic function in patients with systolic dysfunction, and this value may provide clinically useful information for the management of patients with cardiomegaly.
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