@article{Amaral1998,
title={Scale-independent measures and pathologic cardiac dynamics},
author={Amaral LAN, 
Goldberger AL, 
Ivanov PC, 
Stanley HE},
abstract={We study several scale-independent measures of cardiac interbeat interval dynamics defined through the application of the wavelet transform. We test their performance in detecting heart disease using a database consisting; of records of interbeat intervals for a group of healthy individuals and subjects with congestive heart failure. We find that scale-independent measures effectively distinguish healthy from pathologic behavior and propose a new two-variable scale-independent measure that could be clinically useful. We compare the performance of a recently proposed scale-dependent measure and find that the results depend on the database analyzed and on the analyzing wavelet.},
journal={Physical Reviews Letters},
volume={81},
doi={https://doi.org/10.1103/PhysRevLett.81.2388},
year={1998},
month={SEP},
day={14},
pages={2388--2391},
}