The heart's chemical alarm system signals when it is being stretched
In short: When your heart muscle stretches due to excess blood volume, it releases a specific hormone called BNP. While it was originally named for the brain, it is actually a vital cardiovascular messenger that helps regulate blood pressure and serves as a critical diagnostic tool for heart failure.
Brain natriuretic peptide (BNP) is a peptide hormone produced by cardiomyocytes in the heart's ventricles. It is secreted specifically in response to the stretching of the heart muscle caused by increased ventricular blood volume. Although it was first discovered in porcine brain tissue in 1988—leading to its original name—research confirmed its primary role is in the heart. To be more accurate, it is now frequently called B-type natriuretic peptide. The hormone works by decreasing systemic vascular resistance and central venous pressure, which ultimately lowers blood pressure. It also promotes natriuresis (the excretion of sodium in urine) and diuresis (the excretion of water), which reduces overall blood volume. This physiological response helps alleviate the workload on the heart. In clinical settings, doctors measure BNP and its inactive precursor, NT-proBNP, to screen for and monitor the severity of heart failure.
Because BNP has a short half-life of about 20 minutes, it provides a very accurate snapshot of current ventricular status. However, interpreting these levels requires nuance. While levels above 500 pg/mL generally indicate heart failure, other factors can skew the results. For instance, renal disease can cause elevated NT-proBNP levels because the kidneys are responsible for its excretion. Conversely, obesity is often associated with lower BNP levels. Because of these variables, a normal NT-proBNP level is highly effective at ruling out heart failure in emergency settings, but an elevated level cannot be used alone to confirm a diagnosis without considering the patient's clinical history.
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