Natural Time Analysis of Electrocardiograms

摘要: Here, we present the results obtained from natural time analysis of electrocardiograms. Considering that a general agreement about whether normal heart dynamics are chaotic or not is still lacking, and physiological series may be due to mixed process, stochastic deterministic, use here concept entropy which equally applicable deterministic as well processes. Sudden cardiac death frequent cause occur even if electrocardiogram seems strikingly similar healthy individual. Upon employing, however, fluctuations in time, when window certain length sliding each by one “pulse” (heartbeat) through whole series, sudden individuals (SD) can clearly distinguished truly individuals. Furthermore, using complexity measures introduced § 3.6.1 quantify change either changing scale shuffling “pulses” randomly, achieve classification into three categories: healthy, disease patients SD. In addition, considering under reversal, at scales (which have clear physical meaning), only SD risk identified, but also an estimate impending arrest provided. particular, after maximization amplitude ?S 13 heartbeats, ventricular fibrillation starts within ≈3 hours 16 out 18 Finally, 1/ f model proposed leads consistent with progressive modification rate variability children adolescents. The separate