Skip to main content
. Author manuscript; available in PMC: 2011 Mar 13.
Published in final edited form as: Circulation. 2010 Feb 8;121(8):1047–1060. doi: 10.1161/CIRCULATIONAHA.109.192704

Figure 1.

Figure 1

Onset of TdP during the recording of a standard 12-lead ECG in a young male with a history of drug addiction treated with chronic methadone therapy who presented to a hospital emergency department after ingesting an overdose of prescription and over-the-counter drugs from his parent’s drug cabinet. Classic ECG features evident in this rhythm strip include a prolonged QT interval with distorted T-U complex, initiation of the arrhythmia after a short-long-short cycle sequence by a PVC that falls near the peak of the distorted T-U complex, “warm-up” phenomenon with initial R-R cycles longer than subsequent cycles, and abrupt switching of QRS morphology from predominately positive to predominately negative complexes (asterisk).