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. Author manuscript; available in PMC: 2014 Aug 1.
Published in final edited form as: Circ Arrhythm Electrophysiol. 2013 Jul 24;6(4):10.1161/CIRCEP.113.000114. doi: 10.1161/CIRCEP.113.000114

Figure 4.

Figure 4

Use of phase estimation to detect phase resetting. Effect of phase resetting on the alternans voltage (A and C) and Kscore (B and D) estimation on a body-surface lead in two different study subjects (subject 1: panel A and B, subject 2: panel C and D). Artificial decrease (A) or increase (C) of the alternans voltage with concomitant Kscore artificial decrease (B) or increase (D), are in each case associated with the presence of phase resetting caused by a premature ventricular contraction. Detection and removal of phase resetting (in black) results to the corrected alternans voltage and Kscore estimation (in gray). Dashed vertical lines indicate the index of the PVC.