Artif Intell Med - Comparative study of approximate entropy and sample entropy robustness to spikes.

Tópicos

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Resumo

JECTIVE: There is an ongoing research effort devoted to characterize the signal regularity metrics approximate entropy (ApEn) and sample entropy (SampEn) in order to better interpret their results in the context of biomedical signal analysis. Along with this line, this paper addresses the influence of abnormal spikes (impulses) on ApEn and SampEn measurements.METHODS: A set of test signals consisting of generic synthetic signals, simulated biomedical signals, and real RR records was created. These test signals were corrupted by randomly generated spikes. ApEn and SampEn were computed for all the signals under different spike probabilities and for 100 realizations.RESULTS: The effect of the presence of spikes on ApEn and SampEn is different for test signals with narrowband line spectra and test signals that are better modeled as broadband random processes. In the first case, the presence of extrinsic spikes in the signal results in an ApEn and SampEn increase. In the second case, it results in an entropy decrease. For real RR records, the presence of spikes, often due to QRS detection errors, also results in an entropy decrease.CONCLUSIONS: Our findings demonstrate that both ApEn and SampEn are very sensitive to the presence of spikes. Abnormal spikes should be removed, if possible, from signals before computing ApEn or SampEn. Otherwise, the results can lead to misunderstandings or misclassification of the signal regularity.

Resumo Limpo

jectiv ongo research effort devot character signal regular metric approxim entropi apen sampl entropi sampen order better interpret result context biomed signal analysi along line paper address influenc abnorm spike impuls apen sampen measurementsmethod set test signal consist generic synthet signal simul biomed signal real rr record creat test signal corrupt random generat spike apen sampen comput signal differ spike probabl realizationsresult effect presenc spike apen sampen differ test signal narrowband line spectra test signal better model broadband random process first case presenc extrins spike signal result apen sampen increas second case result entropi decreas real rr record presenc spike often due qrs detect error also result entropi decreaseconclus find demonstr apen sampen sensit presenc spike abnorm spike remov possibl signal comput apen sampen otherwis result can lead misunderstand misclassif signal regular

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