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New tracheal sound feature for apnoea analysis

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Abstract

Sleep apnoea syndrome is common in the general population and is currently underdiagnosed. The aim of the present work was to develop a new tracheal sound feature for separation of apnoea events from non-apnoea time. Ten overnight recordings from apnoea patients containing 1,107 visually scored apnoea events totalling 7 h in duration and 72 h of non-apnoea time were included in the study. The feature was designed to describe the local spectral content of the sound signal. The median, maximum and mean smoothing of different time scales were compared in the feature extraction. The feature was designed to range from 0 to 1 irrespective of tracheal sound amplitudes. This constant range could offer application of the feature without patient-specific adjustments. The overall separation of feature values during apnoea events from non-apnoea time across all patients was good, reaching 80.8%. Due to the individual differences in tracheal sound signal amplitudes, developing amplitude-independent means for screening apnoea events is beneficial.

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Acknowledgments

This study was financially supported by the National Technology Agency of Finland, the Research fund of the Tampere University Hospital, the Jenny and Antti Wihuri foundation, the Tampere Tuberculosis foundation, the Emil Aaltonen foundation, the Instrumentarium science foundation, as well as the Finnish Cultural foundation.

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Authors and Affiliations

  1. Department of Clinical Neurophysiology, Medical Imaging Center, Pirkanmaa Hospital District, Tampere, Finland

    A. Kulkas, E. Huupponen, J. Virkkala, M. Tenhunen, A. Saastamoinen, E. Rauhala & S.-L. Himanen

  2. Sleep Laboratory, Brain Work Research Center, Finnish Institute of Occupational Health, Helsinki, Finland

    J. Virkkala

  3. Department of Clinical Neurophysiology, Satakunta Central Hospital, Pori, Finland

    E. Rauhala

Authors
  1. A. Kulkas
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  2. E. Huupponen
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  3. J. Virkkala
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  4. M. Tenhunen
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  5. A. Saastamoinen
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  6. E. Rauhala
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  7. S.-L. Himanen
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Correspondence to A. Kulkas.

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Kulkas, A., Huupponen, E., Virkkala, J. et al. New tracheal sound feature for apnoea analysis. Med Biol Eng Comput 47, 405–412 (2009). https://doi.org/10.1007/s11517-009-0446-z

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  • DOI: https://doi.org/10.1007/s11517-009-0446-z

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