Abstract

Myocardial infarction which happens post operatively belongs to surgery is due to myocardial infarctions with hemodynamic instability. The mortality is increased and reduce the survival of patients undergoing CABG surgery that depends on revascularization and ejection fraction. This study was designed to determine the electrocardiogram changes in patients undergoing coronary artery bypass graft in Afshar cardiovascular research center, Yazd, Iran. In a before-after study, 200 patients who were undergone Coronary Artery Bypass Graft surgery, from October 2001 to 0ctober 2002 in Afshar Cardiovascular Research Center in Yazd, Iran were investigated.Patient s selection was done by Haphazard method that including 145 men and 55 women. Among them 21 patients were treated with off-pump surgery and the other 179 ones treated with on-pump CABG surgery. An electrocardiogram for each patient was done once before surgery, also immediately after surgery (that was in intensive care unit after CABG surgery) and finally when they were discharged from hospital.ECGs were investigated for Q and T waves in Lateral, Anterior and Inferior segments and also left anterior hemi block, left posterior hemi block, left bundle branch block and right bundle branch block. In lateral leads 22 patients had T - depression in preoperative evaluations which was seen in 23 patients in immediately after operation and in 21 patients when they were discharged that it was not significant by chi-square test (P-Value > 0.05). Pathologic Q wave were found in 13 patients with one vessel obstruction category in inferior leads while 28 patients were reported for the same wave with three vessels. In three categorized ejection fraction, 2 patients were found with pathologic Q wave in EF between 35 to 45 and one patient above 45. In conclusion,We found that Pathologic Q wave and Reversed T in lateral, anterior and inferior leads did not changed significantly in pre and post operation investigations in our study. In this survey among conductive disorders only LBBB changed significantly between pre operation and ICU investigation and also between ICU and discharge-time ones which it may because of cardiac inflammation and edema in CABG procedure especially in first two days after surgery and it can be better just with rest. © IDOSI Publications, 2012.