N-Terminal Pro Brain Natriuretic Peptide in Assessment of Severity of Coronary Artery Disease in Patients with Non ST Elevation Acute Coronary Syndrome OC30-OC34
Dr. Abdulkarem Saeed Hassan,
Camp Shizar, Alexandria, Egypt.
Introduction: N-Terminal pro Brain Natriuretic Peptide (NT-pro BNP) is an important biomarker in the management of patients with heart failure. Several studies reported its importance as a predictor of morbidity and mortality in Acute Coronary Syndrome (ACS) patients.
Aim: To compare serum NT-proBNP levels in Non ST Elevation Acute Coronary Syndrome (NSTE-ACS) patients and controls and to assess the relation between Nt-proBNP and the severity of Coronary Artery Disease (CAD) in patients with NSTE-ACS including unstable Angina (UA) and Non ST Elevation Myocardial Infarction (NSTEMI).
Materials and Methods: Sixty NSTE-ACS patients and 20 matched control without significant obstructive CAD were included in the study. Cardiac enzymes, blood urea, serum creatinine, serum NT-proBNP were measured in all patients immediately before coronary angiography. Gensini score and Syntax score were calculated for all study patients. The NSTE-ACS patients were followed up for six months Major Adverse Cardiovascular Events (MACE) including mortality, myocardial infarction, heart failure, stroke, revascularisation by primary percutaneous coronary intervention or Coronary Artery Bypass Grafting (CABG).
Results: The mean serum NT-proBNP in NSTE-ACS (UA and NSTEMI) patients was significantly higher (662.7±635.2) pg/mL than that in the control (102.3±96.4) pg/mL, p<0.001. The effective cut-off value for the diagnosis of CAD was 139 pg/mL, Area Under Curve (AUC)=0.950, 95% CI: 0.890-1.00). The serum NT-proBNP was correlated with the severity and complexity of CAD as measured by Gensini score (r=0.496, p<0.001) and Syntax score (r=0.443, p<0.001). The mean value of NT-proBNP in patients with six months MACE was insignificantly higher than in patients without six months MACE with Interquartile Range (IQR) of 418.5 (139-2037) vs. 366 (175-3237) pg/mL, p=0.970.
Conclusion: NT-proBNP was correlated with the severity and complexity of CAD in NSTE-ACS with preserved left ventricular systolic function, but it has no impact on six months MACE.