Effect of coronary artery bypass grafting on QT interval dispersion

Simov, Dimitar; Simova, Iana; Danov, Vladimir; Christov, Ivaylo
September 2007
Internet Journal of Thoracic & Cardiovascular Surgery;2007, Vol. 10 Issue 1, p1
Academic Journal
Introduction Coronary artery bypass grafting (CABG) improves prognosis in patients with coronary artery disease. An increase in QT interval dispersion (QTd) is a predictor of cardiac death. The aim of present study is to determine the changes in QTd in the early postoperative period following CABG. Methods 63 patients with multivessel CAD undergo CABG. Standard 12 leads surface electrocardiogram is obtained on the day before operation, and on the first and fifth postoperative days. QTd is calculated by two different methods. Results Complete coronary revascularization is performed. The mean QTd1 and QTd2 preoperatively are 86.03ms and 25.35ms, respectively. on the 1st postoperative day QTd1 and QTd2 decrease to 55.30ms, p < 0.001 and 17.04ms, p < 0.001, respectively, and on the 5th postoperative day � to 45.65ms, p < 0.001 and 14.78ms, p < 0.001, respectively. Conclusions We find a statistically significant decrease in QTd in the immediate postoperative period in patients with CABG.


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