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Complexity measures are introduced, that quantify the change of the naturalentropy fluctuations at different length scales in time-series emitted fromsystems operating far from equilibrium. They identify impending sudden cardiacdeath (SD) by analyzing fifteen minutes electrocardiograms, and comparing tothose of truly healthy humans (H). These measures seem to be complementary tothe ones suggested recently [Phys. Rev. E {\bf 70}, 011106 (2004)] andaltogether enable the classification of individuals into three categories: H,heart disease patients and SD. All the SD individuals, who exhibit criticaldynamics, result in a common behavior.Comment: Published in Physical Review

Natural entropy fluctuations discriminate similar-looking electric signals emitted from systems of different dynamics