NCLEX Heart Failure Practice Test

Natriuretic peptides rise when the heart experiences stretch from volume or pressure overload, so their presence in the blood helps distinguish heart failure from other causes of dyspnea. Among the options, NT-proBNP is used to aid diagnosis because it reflects ventricular wall stress and, importantly, has a longer half-life and greater stability in the blood, making test results more reliable across settings. A low NT-proBNP level can help rule out heart failure in a patient with shortness of breath, while a high level supports a heart failure diagnosis and often correlates with severity. The other biomarkers point to different problems: BNP is another natriuretic peptide with a similar role, D-dimer assesses clotting and thromboembolism, and troponin indicates myocardial injury such as infarction.