E Rodriguez et al 2008 Physiol. Meas. 29 1255 doi:10.1088/0967-3334/29/11/002
E Rodriguez1, C Lerma2, J C Echeverria1 and J Alvarez-Ramirez1
Show affiliationsWe applied detrended fluctuation analysis to characterize at very short time scales during episodes of cardiac arrhythmias the raw electrocardiogram (ECG) waveform, aiming to get a global insight into its dynamical behaviour in patients who experienced sudden death. We found that in 15 recordings involving different types of arrhythmias (taken from PhysioNet's Sudden Cardiac Death Holter Database), the ECG waveform, besides showing a less-random dynamics, becomes more regular during bigeminy, ventricular tachycardia or even atrial fibrillation and ventricular fibrillation. The ECG waveform scaling properties thus suggest that reduced complexity dominates the underlying mechanisms of arrhythmias. Among other explanations, this may result from shorted or restricted (i.e. less diverse) pathways of conduction of the electrical activity within ventricles.
87.80.-y Biophysical techniques (research methods)
87.19.R- Mechanical and electrical properties of tissues and organs
Issue 11 (November 2008)
Received 16 April 2008, accepted for publication 29 August 2008
Published 9 October 2008
E Rodriguez et al 2008 Physiol. Meas. 29 1255
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