Alterations in QT Interval in Patients Undergoing Living Donor Liver Transplantation

Background. QT interval prolongation, predisposing to ventricular tachyarrhythmia, has frequently been observed in patients with liver cirrhosis. During liver transplantation (LT) surgery, electrolyte imbalance and hemodynamic instability may affect QT interval changes. We evaluated the alterations in QT parameters at each stage of LT surgery. Methods. We assessed 50 living donor LT recipients without overt heart disease for the corrected QT (QTc) and the interval from peak to the end of the T wave (Tp-e) automatically using Bazett's formula with LabChart software. QT parameters, laboratory and hemodynamic data were simultaneously collected in the following stages of LT: before anesthetic induction (baseline), pre-anhepatic, anhepatic, 1 hour postreperfusion, and after hepatic artery anastomosis. Recipients were allocated into 2 groups according to their baseline QTc: >= 440 versus <440 msec. Results. QTc progressively rose from the pre-anhepatic stage remaining prolonged in each stage of LT surgery compared with the baseline. In the anhepatic stage, 54% of recipients showed marked prolongation of QTc >= 500 msec (522 +/- 14), which indicated the potential for a fatal ventricular dysrhythmia: 77% and 36% in groups with QTc >= 440 and <440 msec, respectively. As opposed to changes in QTc, Tp-e in the anhepatic stage decreased significantly; however, it returned to the baseline level in the neohepatic stage. Conclusion. A prolonged QTc interval (>= 500 msec) was frequently observed throughout the procedure of LT, even among patients with baseline QTc <440 msec, emphasizing the importance of optimizing electrolyte balance and hemodynamic status to reduce greater risk of perioperative arrhythmias.