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. Author manuscript; available in PMC: 2014 Dec 9.
Published in final edited form as: Trends Cardiovasc Med. 2008 Aug;18(6):216–224. doi: 10.1016/j.tcm.2008.11.002

Figure 1.

Figure 1

Surface ECG showing a prolonged QTc of 687. Measurement of the QTc is calculated as the duration of the QT interval, divided by the square root of the preceding RR interval.