الفهرس 
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Abstract
Objective: The aim of this study is to evaluate the relation between LA strain and the severity of coronary artery stenosis in patients with CAD.
Study design: A total 30 patients with stable coronary artery disease (SCAD) with coronary artery stenosis (>50%) who were admitted for elective coronary angiography at Ain Shams University hospitals was included in the study. Measurements of conventional echocardiographic parameters as well as LA strain and strain rate parameters were obtained. Also the syntax score was calculated for all patients.
Results: Patients were categorized into 3 groups: low Syntax score of <23 (group I), moderate syntax score 23-33(group II) and high syntax score of ≥33 (group III). PALS (group I: 29.80±4.48, group II: 22.44±1.42, group III: 19.53±4.46; p<0.001) and PACS (group I: 13.43±4.05, group II: 10.84±2.47, group III: 7.19±0.71; p<0.022) were lower in high syntax group.Correlation analysis indicated inverse correlation between SX score level and LA strain parameters (PALS and PACS)(r=0.861; p<0.001).
Conclusion: Left atrial deformation analysis by 2D Speckle tracking Doppler Echocardiography can predict the severity of coronary artery disease.