Interpret B-type natriuretic peptide (BNP) for heart failure evaluation. BNP below 100 pg/mL: HF unlikely. BNP 100-500 pg/mL: heart failure possible, consider other causes. BNP above 500 pg/mL: heart failure highly likely. BNP is secreted by ventricular myocytes in response to increased wall stress from volume or pressure overload.
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