| http://www.w3.org/ns/prov#value | - uish systolic from diastolic HF.8 Brain natriuretic peptide (BNP) is a hormone released into the bloodstream when myocardial stretch and increased filling pressures are present.3 BNP levels greater than 400 pg/mL in the presence of dyspnea should prompt consideration of HF.3 Electrocardiography and chest x-ray can evaluate for underlying causes including myocardial ischemia, left ventricular hyper
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