PMC3927008_01
Preoperative electrocardiography. The calculated corrected QT interval from lead II is 455 ms.
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F1
ECG was performed just before surgery and showed atrial fibrillation with a normal heart rate (Fig. 1).
Changes observed in lead II by electrocardiography (ECG) during anesthesia. (A) ECG after anesthetic induction (QTc = 492 ms) showed QTc interval prolongation. (B) At 50 min after the patient's arrival, large QRS tachycardia appeared (QTc = 480-490 ms). (C) The R-on-T phenomenon and ventricular premature beats were observed during the occurrence of large QRS tachycardia. (D) During cardiac arrest, ECG demonstrated torsade de pointes. ECG: electrocardiography, QTc: corrected QT interval.
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F2
At that time, sudden-onset large QRS tachycardia (Fig. 2B) appeared, and the femoral and radial arterial waves became flat.
Electrocardiography on the day of patient's expiry. The measured corrected QT interval in lead II is over 500 ms.
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F3
ECG showed a marked prolonged QTc interval (Fig. 3).