PMC8168475_01
Shows day 1 ECG with a QTc of 495 ms.
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fig1
QTc of 495 ms, shown in Figure 1. QT intervals and RR intervals were measured manually for the calculation of the QTc using Bazett's method; the calculated values were consistent with the automatic machine measurements.
Shows day 2 ECG with a QTc of 621 ms.
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fig2
A repeat ECG one day postadmission showed a QTc of 621 ms, shown in Figure 2.
Shows day 24 ECG with a QTc of 445 ms.
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fig3
Her QTc resolved to a normal level of 445 ms, shown in Figure 3.