Plasma and pericardial fluid natriuretic peptide levels in postinfarction ventricular dysfunction

Area of Science:

• Cardiology
• Biochemistry

Background:

• Atrial natriuretic peptide (ANP) and B-type natriuretic peptide (BNP) are cardiac hormones involved in cardiovascular homeostasis.
• Ventricular dysfunction following myocardial infarction (MI) can lead to altered natriuretic peptide levels.

Purpose of the Study:

• To investigate plasma and pericardial fluid ANP and BNP concentrations in patients with postinfarction ventricular dysfunction.
• To determine the association of these peptide levels with left ventricular (LV) dysfunction and the location of the MI.

Main Methods:

• Plasma and pericardial fluid samples were collected from 37 patients undergoing coronary bypass surgery.
• Patients were categorized into three groups based on ECG and coronary angiography: anterior MI (n=12), inferior/posterior MI (n=15), and no history of MI (n=10).

Main Results:

• Patients with anterior MI exhibited significantly elevated plasma ANP and BNP, and pericardial fluid BNP compared to controls.
• Patients with inferior/posterior MI showed increased pericardial fluid BNP but not plasma levels compared to controls.
• Even with normal left ventricular ejection fraction (LVEF ≥ 45%), anterior MI patients had increased plasma and pericardial fluid BNP.

Conclusions:

• Anterior myocardial infarction is linked to heightened cardiac BNP production, irrespective of preserved LV systolic function.
• Elevated pericardial fluid BNP in post-MI patients indicates augmented ventricular myocardium synthesis and release of BNP, independent of LVEF.