BACKGROUND/PURPOSE - The neutrophil/lymphocyte ratio (NLR) has been proposed as a prognostic marker in acute myocardial infarction (AMI). The aim of our study is to demonstrates the correlation between SYNTAX score (SXs) and NLR and its association with 1-year cardiovascular (CV) mortality in patients with ST-segment elevation myocardial infarction (STEMI) or non-ST-segment elevation myocardial infarction (NSTEMI) treated with percutaneous coronary intervention (PCI).
METHODS/MATERIALS - Over 6 consecutive years, (1st January 2010 and 1st January 2016) 6560 patients (4841 males and 1719 females, mean age 64.36±11.77years) were admitted for AMI and treated with PCI within 24-h. The study population was divided into tertiles based on the SXs.
RESULTS - Both in STEMI and NSTEMI groups, neutrophils and the SXs were significantly higher (p<0.0001) in upper versus lower among NLR tertiles and a significant correlation was found between the NLR and SXs (r=0.617, p<0.0001 and r=0.252, p<0.0001 for STEMI and NSTEMI groups, respectively). One-year CV mortality significantly raised up among the NLR tertiles in both STEMI and NSTEMI patients (p<0.0001). Multivariate analysis revealed that, after adjusting SXs and PAD, an NLR (≥3.9 and ≥2.7 for STEMI and NTEMI patients, respectively) was an independent significant predictor of 1-year CV mortality (OR 2.85, 95% CI 1.54-5.26, p=0.001 and OR 2.57, 95% CI 1.62-4.07, p<0.0001 for STEMI and NSTEMI respectively.) CONCLUSIONS: NLR significantly correlates with SXs and is associated with 1-year CV mortality in patients with STEMI or NSTEMI treated with PCI within 24-h.