Marked decrease in BNP levels in 2 related patients with reversible dilated cardiomyopathy

Area of Science:

• Cardiology
• Genetics
• Biochemistry

Background:

• Congestive heart failure (CHF) is a complex syndrome.
• B-type natriuretic peptide (BNP) is a key biomarker in diagnosing and managing CHF.
• Echocardiography provides crucial data on cardiac structure and function, including left ventricular diastolic dimensions (LVDd) and ejection fraction (EF).

Observation:

• Two male patients with CHF, aged 30s and 50s, presented with elevated plasma BNP, enlarged LVDd, and reduced EF.
• Coronary arteriography excluded significant coronary artery disease in both cases.
• Following treatment, both patients experienced substantial improvements in LVDd and EF, with plasma BNP levels falling below detectable limits.

Findings:

• The patients' relatedness suggests a potential role for genetic factors influencing plasma BNP levels.
• The marked reduction in plasma BNP during follow-up correlated with improved cardiac function.
• Absence of coronary stenosis points towards non-ischemic cardiomyopathy.

Implications:

• A significant decrease in plasma BNP during follow-up may serve as an indicator of preserved neurohormonal function and organ system integrity in CHF patients.
• This case series highlights the importance of considering genetic predispositions in specific CHF presentations.
• Further research into genetic influences on natriuretic peptide levels in heart failure is warranted.