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. Author manuscript; available in PMC: 2017 Aug 23.
Published in final edited form as: Int J Cardiol. 2015 Mar 14;186:250–258. doi: 10.1016/j.ijcard.2015.03.074

Fig. 1.

Fig. 1

Digitization and signal processing of a representative VF trace. A. Upper panel, single lead VF trace from paper ECG prior to the first DC shock. Lower panel, 5-s VF epoch after digitization, segmentation and codification. B. Representative spectra of the VF trace shown in A. DF, MF, 1-Hz DF spectral concentration and PSD80%, are shown. The univariate cut-off at 3.9 Hz was used to define low and high PSD bands. DF = dominant frequency. MF =median frequency. NSC = normalized spectral concentration. PSD = power spectral density.