The aim of the study was to investigate the relationship between severity of coronary artery disease (CAD) assessed with SYNTAX score (SS) and myocardial performance index (MPI) in stable CAD. (Echocardiography 2013;30:385-391).Methods
The study participants consisted of 106 consecutive patients (mean age: 57.6 ± 9.5 years) with angiographically proven obstructive stable CAD and 30 patients with nonobstructive CAD (control group) (mean age: 58.0 ± 7.6 years). The MPI was calculated by using pulsed-wave Doppler before coronary angiography. Coronary angiography was performed in all patients. The SS was prospectively calculated in 106 obstructive CAD patients. Patients were partitioned into 3 groups based on SS. Frequencies of risk factors, biochemical and hematological data were recorded in all patients.Results
The SS tertiles were defined as SSlow ≤ 8 (n = 35), SSmid ≤ 17 (n = 36), and SShigh > 17 (n = 35). The patients with SShigh group (mean MPI; 0,48 ± 0.06) based on SS had significantly higher MPI values compared with the SSmid (mean MPI; 0,44 ± 0.05), SSlow (mean MPI; 0.43 ± 0.06), and control (mean MPI; 0.41 ± 0.05) groups (P < 0.05 for all). The MPI levels of control group were also lower than compared with SSmid group (P = 0.006). The MPI value was significantly correlated with SS (r = 0.564, P < 0.001), diabetes (r = 0.355, P < 0.001), hypertension (r = 0.326, P < 0.001), and ejection fraction (EF) (r = −0.224, P = 0.018) in bivariate analysis. Multivariate regression analysis showed that MPI was independently associated with SS (β = 0.486, P < 0.001) and diabetes (β = 0.205, P = 0.028).Conclusion
Although the normal EF, MPI value was impaired in proportion to the severity of CAD in patients with stable CAD.