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Variability of thoracic impedance cardiograms in man

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Abstract

The variability of thoracic impedance cardiogram signals was studied in a normal population with the objective of determining the effect of different respiratory manoeuvres and the optimal criteria for acquisition of this type of physiological signal. The variability of the first derivative of the thoracic impedance signal (dZ/dt) was determined at each 5ms intervals along the signal as the ensemble confidence limits of 3% and 97% around the coherent average. The results obtained indicate that: (a) signal variability is minimum during respiratory apnea (p<0.05) as compared with apneusis or normal respiration, (b) signal patterns are different during apnea and apneusis, and (c) during normal respiration the cardiac component of the thoracic impedance signal can be extracted from the respiratory noise by coherent average yielding a signal with the same pattern obtained during apnea.

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  1. Biomedical Engineering Laboratory, COPPE/UFRJ, Caixa Postal 1191-20.010, Rio de Janeiro, Brazil

    W. M. de Souza & R. B. Panerai

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  1. W. M. de Souza
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  2. R. B. Panerai
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de Souza, W.M., Panerai, R.B. Variability of thoracic impedance cardiograms in man. Med. Biol. Eng. Comput. 19, 411–415 (1981). https://doi.org/10.1007/BF02441304

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  • DOI: https://doi.org/10.1007/BF02441304

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