Abstract:
A reduction in QT dispersion (QTd) has been previously shown in patients receiving thrombolytics
and undergoing coronary artery bypass grafting (CABG). The purpose of the present study was to
investigate changes occurring in corrected QT intervals or QT dispersion after CABG and
concomitant aneurysmectomy in the same session. The study population included 43 patients with
coronary artery disease with left ventricular aneurysm (LVA). The control group included 32 patients
with coronary artery disease without LVA. The study patients underwent CABG and aneurysmectomy
in the same surgical session. Corrected maximum and minimum QT interval duration (QTcmax
and QTcmin) and corrected QT dispersion (QTcd) were measured in the study patients before and
after surgery. QTcmax and QTcd in the patients with LVA were significantly higher than in the
patients without LVA ( P b .001 and P b .001, respectively). QTcmax and QTcd in the patients with
LVA were significantly shortened after surgery ( P b .001 and P b .001, respectively). This study
showed that QTcmax and QTcd values are significantly reduced after CABG and concomitant
aneurysmectomy. We have suggested that coronary revascularization and left ventricular
reconstruction in the same session have beneficial effects on QT interval duration and dispersion.
