Objectives: This study aimed to assess the effects of percutaneous coronary intervention (PCI) on regional and global left
ventricular (LV) functions (systolic and diastolic) in patients with coronary artery disease (CAD) using tissue Doppler strain rate (SR)
imaging. Patients and Methods: in this study, we randomly assigned 100 Egyptian adult symptomatic patients with CAD that underwent
coronary angiography and candidate for PCI on the left anterior descending artery. LV early diastolic and systolic SR were measured 24 h
before and 48 h after PCI. Results: Most of the LV diastolic and systolic parameters(A, E’, E/A, E/E’, and isovolumic relaxation time [IVRT])
showed significant difference before and after elective PCI, while mitral E velocity, DT, and pulmonary vein flow before and after PCI did
not show significant difference. SR imaging findings showed high significant difference mean peak systolic and mean early diastolic SR of
ischemic regions after PCI;   mean early diastolic SR before PCI was 1.86 ± 0.13 while after PCI was 2.57 ± 0.18 (P < 0.001) and mean peak
systolic SR before PCI was 0.65 ± 0.18 while after PCI was 0.901 ± 0.15 (P < 0.001). Conclusion: Most of the LV diastolic and systolic
parameters (A, E’, E/A, E/E’, and IVRT) improved after PCI in CAD patients. Furthermore, regional myocardial function as measured by
mean peak systolic and mean early diastolic SR in the ischemic segments improved significantly compared with that in nonischemic segments.