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Definition of B-type natriuretic peptide

B-type natriuretic peptide: A 32-amino-acid polypeptide secreted by the ventricles of the heart in response to excessive stretching of heart muscle cells. The levels of B-type natriuretic peptide are elevated in patients with congestive heart failure, and correlate with both the severity of symptoms and the prognosis. Also known as BNP.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=30739
Last Editorial Review: 3/19/2012

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