Correlation and prognostic role of neutrophil to lymphocyte ratio and SYNTAX score in patients with acute myocardial infarction treated with percutaneous coronary intervention: A six-year experience

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 +/- 11.77 years) 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. (c) 2017 Elsevier Inc. All rights reserved.