Introduction: Coronary artery disease (CAD) is one of the most common causes of morbidity and mortality in
developed countries. SYNTAX (SX) score is a useful index that scores lesion severity during coronary angiography
(CA) and can predict the patient’s outcome. Recent studies have associated a number of serum parameters with
SX score, including platelet volume, and platelet-to-lymphocyte ratio (PLR).
Objectives: We aimed to study the SX score in association with various serum parameters to find a valuable
parameter for prediction of CAD severity.
Patients and Methods: This study consisted of 363 patients referred to Heshmat hospital (Rasht) from March
2016 to October 2016 with acute coronary syndrome (ACS). Serum laboratory parameters were measured after
12 hours of fasting. Severity of CAD was evaluated during CA by SX score. The associations were analyzed using
multinomial logistic regression model.
Results: The mean age of patients was 63.68±11.03 years; since 26.2% of cases had severe, 43% had moderate,
and 30.8% had mild CAD. Comparing to mild CAD, the multivariate adjusted model showed higher significant
odds of severe CAD for one elevation of platelets (odds ratio [OR] =2.18 (95% CI: 1.35-3.50), white blood cells
(WBCs) (OR=1.66, 95% CI: 1.17-2.35) RDW (red cell distribution width), (OR=1.59, 95% CI: 1.08-2.35) and
serum creatinine (OR=1.75, 95% CI: 1.16-2.63).
Conclusion: Plasma platelets, WBC and RDW and also serum creatinine were all independently correlated with
severity of CAD.