Fig. 1
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40981-017-0093-6/MediaObjects/40981_2017_93_Fig1_HTML.gif)
12-lead ECG performed before the operation. The ECG shows not only the obvious QTc interval prolongation (QTc 631 ms by Bazett formula) but also prolongation of the Tp-e interval (Tp-e 126 ms)
12-lead ECG performed before the operation. The ECG shows not only the obvious QTc interval prolongation (QTc 631 ms by Bazett formula) but also prolongation of the Tp-e interval (Tp-e 126 ms)