en Cardiology Cardiology Original Article Original Article <span style="font-size:14px;"><span style="font-family:Times New Roman;"><span style="line-height:13.7pt"><b><i><span style="color:blue">Background</span></i></b><i><span style="color:blue">:</span></i> For patients with advanced, diffuse Coronary artery disease (CAD), surgical myocardial revascularization via coronary artery bypass grafting (CABG) continues to represent the gold standard therapeutic approach. Given the paucity of studies demonstrating CABG benefits in patients with significant left intraventricular dyssynchrony (LVD), we conducted this study to evaluate how viable myocardial tissue volume, quantified by dobutamine stress echocardiography (DSE), predicts postoperative LVD improvement.</span><br> <span style="line-height:13.7pt"><b><i><span style="color:blue">Methods:</span></i></b> This investigation employed a cross-sectional analytical design to assess 30 CABG candidates with moderate-severe ischemic cardiomyopathy. Myocardial viability evaluation utilized dobutamine stress echocardiography, complemented by tissue Doppler Imaging for synchronized assessment of regional LV contractility.&nbsp; </span><br> <span style="line-height:13.7pt"><b><i><span style="color:blue">Results:</span></i></b> Demographic analysis revealed a study population aged 61.5&plusmn;7.9 years (range: 47 to 85 years), comprising 73.3% males. Left ventricular ejection fraction (LVEF) measurements improved from 32.2&plusmn;4.6% at baseline to 39.6&plusmn;5.2 % following surgical revascularization (p<0.001). Postoperative resolution of left ventricular dyssynchrony occurred in 9 patients (30.0 %), whereas 19 patients (63.3 %) showed no improvement (p<0.001). Two patients (6.6 %) died due to progressive heart failure and inadequate revascularization. </span><br> <span style="line-height:13.7pt"><b><i><span style="color:blue">Conclusion</span></i></b><i><span style="color:blue">:</span></i> Our current study demonstrates significant postoperative improvements in LVEF, LVEDD, and left ventricular dyssynchrony. However, given that approximately two-thirds of cases showed only minimal improvement in dyssynchrony, it would be reasonable to consider cardiac resynchronization therapy (CRT) for these patients. </span></span></span><br> &nbsp; Dobutamine stress echocardiography, Coronary artery bypass grafting, Left ventricular dyssynchrony 158 162 http://caspjim.com/browse.php?a_code=A-10-3091-2&slc_lang=en&sid=1 Rezvanieh Salehi salehiir2002@yahoo.com 100319475328460055834 100319475328460055834 No Cardiovascular Research Center, Tabriz University of Medical Sciences, Tabriz, Iran. Zahra Jabbary Dr.z.Jabbary@gmail.com 100319475328460055835 100319475328460055835 Yes Department of Cardiology, Babol University of Medical Sciences, Babol, Iran Fariba Abaszadeh 100319475328460055836 100319475328460055836 No Cardiovascular Research Center, Tabriz University of Medical Sciences, Tabriz, Iran Maryam Chenaghlou mchenaghlou@yahoo.com 100319475328460055837 100319475328460055837 No Cardiovascular Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.