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Chest X-rays and plasma B-type natriuretic peptide (BNP) levels are useful for diagnosing congestive heart failure. However, the relationship between plasma BNP levels and pulmonary congestion on chest X-rays often seems inconsistent. Extracardiac factors can directly alter plasma BNP levels, independent of cardiac function. In the present study, we examined the clinical factors that impact the diagnosis of heart failure by using chest X-rays and plasma BNP levels.

internal medicine

Contribution of Extracardiac Factors to the Inconsistency Between Plasma B-type Natriuretic Peptide Levels and the Severity of Pulmonary Congestion on Chest X-rays in the Diagnosis of Heart Failure