Abstract
Respiration monitoring by means of electric field plethysmography is influenced by cardiac activity, which represents an artefact although of physiological relevance itself. For a separation of respiration and cardiac signals, a portable plethysmograph was developed, which uses a fifth electrode in addition to the conventional tetrapolar electrode arrangement. The separation is attained by weighted software subtraction of two detected signals. In a comparative way, three mathematical methods are discussed for the effective determination of individual weighting factors. Results of the practical applications indicate the best results for a method based on Fast Fourier Transformation.
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Nakesch, H., Pfützner, H., Ruhsam, C. et al. Five-electrode field plethysmography technique for separation of respiration and cardiac signals. Med. Biol. Eng. Comput. 32 (Suppl 1), S65–S70 (1994). https://doi.org/10.1007/BF02523330
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DOI: https://doi.org/10.1007/BF02523330