Statistical analysis
Statistical analysis was carried out with the SPPS program (version 21.0, SPSS, Chicago, İllinois, USA). All measurements were evaluated with the Kolmogorov-Smirnov test for normality. A comparison of continuous variables between the groups was performed using the Mann-Whitney U test. All continuous variables were expressed as mean ± standartd deviation values. PLS values were compared to according to presence of more than 50% stenosis least one vessel. Categorical variables were analysed using the Chi-square test. Presence of PSS in each segment were compared according to more than 50% stenosis in segment related coronary artery. We also evaluated the relation between presence of PSS of segments and presence of severe coronary artery disease of at least one vessel. Correlations between coronary artery disease severity and peak systolic strain for each coronary artery and its territory was evaluated by a Pearson correlation test where two-sided P values <0.05 were accepted as statistically significant