PMC5804612_01
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)
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PMC5804612_01_40981_2017_93_Fig1_HTML.jpg
Fig1
His 12-lead ECG performed before the operation showed 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) (Fig. 1).
Time courses of the QTc interval, the Tp-e interval, and the HR interval during anesthesia. The QTc interval, the Tp-e interval was also prolonged after sevoflurane exposure, with peaks of QTc (727 ms) and Tp-e (222 ms) at 20 min after sevoflurane exposure. Both the QTc and the Tp-e intervals gradually decreased with time and returned to around the pre-anesthetic levels 40 min after sevoflurane administration
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PMC5804612_01_40981_2017_93_Fig2_HTML.jpg
Fig2
Tp-e interval, which is from the peak to the end of the T wave, were measured manually. The QT interval was adjusted for the patient's heart rate using Bazett's formula (QTc = QT/[RR/1,000]1/2). The time courses of the QTc interval, the Tp-e interval, and the HR interval during anesthesia are shown in Fig. 2.