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. Author manuscript; available in PMC: 2011 May 4.
Published in final edited form as: J Am Coll Cardiol. 2010 Jan 29;55(18):1955–1961. doi: 10.1016/j.jacc.2009.12.015

Figure 3. QT Interval Stretching in LQT1.

Figure 3

A 22-year-old woman with long QT syndrome mutation LQT1. (Left panel) At baseline, heart rate is 68 beats/min, QT interval is 480 ms, and corrected QT interval (QTc) is 512 ms. (Middle panel) Immediately after standing, there is movement artifact; heart rate increases to 82 beats/min but the QT interval fails to shorten, and the QTc interval increases to 582 ms (the QT interval stretches all the way to the next P-wave). (Right panel) At the end of the test, heart rate returns to baseline but the QT interval remains prolonged, and the QTc interval is 565 ms long and has abnormal morphology.