Key result
Interbeat fractal dynamics differ across aging and heart failure, showing distinct crossover behavior.
Why the study?
Fractal organization of heart rate dynamics differs among healthy young, healthy elderly, and congestive heart failure patients, but detailed characterization is lacking.
Does fractal organization of interbeat cardiac time series differ among healthy young, healthy elderly, and congestive heart failure patients?
Observational
Does fractal organization of interbeat cardiac time series differ among healthy young, healthy elderly, and congestive heart failure patients?
Fractal dimension analysis of heart rate dynamics reveals distinct patterns differentiating healthy aging from congestive heart failure.
Answers are grounded in this paper and cite their sources.
Fractal heart rate distinctions may aid phenotyping; leaves open added prognostic value beyond conventional metrics in observational data.
In this work we analyze interbeat cardiac time series arising of three groups: healthy young and healthy elderly subjects and patients with congestive heart failure. We use the fractal dimension method proposed by Higuchi. We find that fractal organization is different for each group. In the case of healthy young subjects only one value of the fractal dimension is necessary to fit the interbeat data, whereas in the cases of healthy elderly and patients with congestive heart failure a crossover behavior in the fractal dimension is present but in opposite directions. By means of a "zoom" on the hinges of the crossover point interesting effects of aging are presented. Finally, we discuss our results in the context of heart interbeat dynamics.
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Guzmán-Vargas et al. (2003) conducted an observational in Congestive heart failure. Aging and congestive heart failure vs. Healthy young subjects was evaluated on Fractal dimension of interbeat cardiac time series. Fractal organization of interbeat cardiac time series differs among healthy young, healthy elderly, and heart failure patients, with crossover behavior present in the latter two groups.
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