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. Author manuscript; available in PMC: 2006 Oct 1.
Published in final edited form as: J Electrocardiol. 2005 Oct;38(4 Suppl):75–80. doi: 10.1016/j.jelectrocard.2005.06.009

Fig. 3.

Fig. 3

Stored endocardial electrogram derived from the ICD memory showing an episode of primary ventricular fibrillation in short QT syndrome. The ventricular tachyarrhythmia was initiated by a short coupled premature ventricular beat (VS encircled; coupling interval, 180 milliseconds) (upper electrogram strip, shock electrogram; lower electrogram strip, rate electrogram; ICD markers: FS, fibrillation sensing; FD, fibrillation detection; VS, ventricular sensing).