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2014 8th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)

DOI: 10.1109/esgco.2014.6847590

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Day-to-night variations of RR intervals complexity observed in 24-h ECG Holter R

Proceedings article published in 2014 by Sebastian Zurek, Jaroslaw Piskorski, Premislaw Guzik, Marcin Kosmider, Mateus Lewandowski, Paolo Castiglioni ORCID
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This paper is available in a repository.

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Abstract

Complexity of RR intervals can be measured by Sample entropy (SampEn) traditionally estimated only for a limited number of points by fixing the values of the embedding dimension "m" and distance threshold "r". Recently we have proposed a new and fast Norm Component Matrix (NCM) algorithm for SampEn calculation - it allows analyzing whole ranges of (m, r) values leading to entropy surfaces. This study is aimed at the analysis of these surfaces in the scope of day-to-night variations of RR intervals complexity estimated by the NCM.