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Empirical mode decomposition: a method to reduce low frequency interferences from surface electroenterogram

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Abstract

The surface electroenterogram (EEnG) is a non-invasive method of studying myoelectrical bowel activity. However, surface EEnG recordings are contaminated by cardiac activity, respiratory and motion artifacts, and other sources of interference. The aim of this work is to remove the respiration artifact and the very low frequency components from surface EEnG by means of empirical mode decomposition (EMD). Eleven recording sessions were carried out on canine model. Several parameters were calculated before and after the application of the method: signal-to-interference ratio (S/I ratio) and the attenuation level of the signal and of interference. The results show that the S/I ratio was significantly higher after the application of the method (3.68 ± 5.54 dB vs. 10.45 ± 3.65 dB), the attenuation level of signal and of interference is −0.49 ± 0.80 dB versus −7.26 ± 5.42 dB, respectively. Therefore, EMD could be a useful aid in identifying the intestinal slow wave and in removing interferences from EEnG recordings.

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Acknowledgments

The authors thank J. Bertelli, J. L. Guardiola, Dr. C. Vila and the Veterinarian Unit of the Research Centre of ‘La Fe’ University Hospital (Valencia, Spain), where surgical interventions and recording sessions were carried out, and the R + D + I Linguistic Assistance Office at the UPV for their help in revising this paper. This work was supported by the Instituto Carlos III (FIS-03/0432), by the Universidad Politécnica de Valencia under Programa de apoyo a la investigación y el desarrollo de la UPV, and by Conselleria de Universitat, Educació y Ciència de la Generalitat Valenciana.

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Authors and Affiliations

  1. Centro de Investigación e Innovación en Bioingeniería, Universidad Politécnica de Valencia, Camino de Vera, 46022, Valencia, Spain

    Y. Ye, J. Garcia-Casado & J. L. Martinez-de-Juan

  2. Departamento de Cirugía, Hospital Universitario la Fe de Valencia, 46022, Valencia, Spain

    J. L. Ponce

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  1. Y. Ye
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  2. J. Garcia-Casado
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  3. J. L. Martinez-de-Juan
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  4. J. L. Ponce
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Correspondence to Y. Ye.

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Ye, Y., Garcia-Casado, J., Martinez-de-Juan, J.L. et al. Empirical mode decomposition: a method to reduce low frequency interferences from surface electroenterogram. Med Bio Eng Comput 45, 541–551 (2007). https://doi.org/10.1007/s11517-007-0189-7

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  • DOI: https://doi.org/10.1007/s11517-007-0189-7

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