Objective  To investigate the roles of speckle tracking echocardiography in the evaluation of left ventricular systolic function for patients with coronary artery disease (CAD) after percutaneous coronary intervention (PCI).

  Methods  Fifty-one CAD patients undergoing PCI were selected as study group, and 51 volunteers were selected as control group. The left ventricular systolic function was detected by speckle tracking technology of color Doppler ultrasound diagnostic instrument in the two groups. The study group was detected before PCI and 3 months after PCI, and the control group was detected at physical examination. The left ventricular end diastolic diameter (LVDd), left ventricular end systolic diameter (LVDs), peak early flow velocity (E)in mitral, peak late flow velocity (A), the ratio of E to A (E/A), left ventricular ejection fraction (LVEF) were compared between the two groups before and after PCI. The correlations between global peak radial strain (GPRS), global peak longitudinal strain (GPLS), global peak circumferential strain (GPCS) and LVEF detection changes in the study group were analyzed. Speckle-tracking imaging curve and longitudinal strain bull eye diagram were observed in two groups.

  Results  The A value of the study group before and after PCI was significantly higher, and the E/A and LVEF of the study group were significantly lower than that of the control group (P < 0.01); LVEF after PCI was significantly higher than that before PCI (P < 0.01); the GPRS of the study group before and after PCI was significantly lower, and the GPLS and GPCS of the study group were significantly higher than that of the control group (P < 0.01). GPRS in the study group after PCI was significantly higher, and GPLS and GPCS were significantly lower than before (P < 0.01). GPRS, GPLS and GPCS in the study group were correlated with LVEF (r=-0.722, -0.545, -0.667, P < 0.05). Before PCI, the shape and amplitude of motion curve of each segment of STI curve were inconsistent, and the contour was irregular and obviously separated. The STI curve after PCI showed that the shape and amplitude of motion curve of each segment were basically consistent, and the curve had tended to be normal; in the control group, the contour of strain curve was regular, the peak time was unified, and the peak and trough were consistent.

  Conclusion  Ultrasound speckle tracking technique can effectively evaluate left ventricular systolic function in patients with coronary heart disease after PCI, and has the advantages of repeatable tracking, convenience and painless.