Natriuretic peptide
>A-type natriuretic peptide is secreted largely by the atrial myocardium in response to dilatation.
>B-type natriuretic peptide is manufactured mainly by the ventricular myocardium.
>C-type natriuretic peptide is produced by endothelial cells that line the blood vessels.
</LI></UL> B-type natriuretic peptide is useful in the diagnosis of heart failure.
The finding of a low level of B-type natriuretic peptide tends to exclude heart failure.