van der Heide et al. Journal of Medical Case Reports 2011, 5:368 http://www.jmedicalcasereports.com/content/5/1/368 Page 3 of 5 Figure 1 Perioperative electrocardiographic (ECG) recordings. a) Preoperative ECG. Sinus rhythm, 58 beats/min. Without QT prolongation (QTc, 440 msec). b) Two recordings of torsades de pointes episodes. Note the short-long-short phenomenon preceding the arrhythmia in the upper recording. c) Postoperative ECG. Sinus rhythm, 77 beats/min. With prolonged QT interval (QTc, 505 msec), best seen in aVF. In leads V1-V4, there are possible U waves merging into the P wave.