Elevated B-type natriuretic peptide (BNP) in suspected heart failure indicates what?

• A. It suggests increased ventricular wall stress and supports heart failure diagnosis
• B. Indicates liver failure
• C. Concludes absence of heart failure
• D. Reflects kidney function only

Answer: (A)

BNP is released by the heart’s ventricles when they are stretched by increased pressure or volume. In heart failure, the ventricles experience more wall stress, so BNP levels rise. This makes BNP a useful marker to support a heart failure diagnosis and to help distinguish cardiac causes of dyspnea from noncardiac ones. It isn’t a direct indicator of liver function, and while kidney disease can affect BNP levels by reducing clearance, elevated BNP primarily reflects ventricular wall stress rather than solely kidney function. It also doesn’t imply that heart failure is absent; higher BNP levels make heart failure more likely, guiding clinicians toward that diagnosis.