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A VIRTUAL INSTRUMENT FOR TRANS-THORACIC IMPEDANCE INVESTIGATIONS

E. Piuzzi, D. A. Lampasi, S. Pisa, L. Podestà
  • Abstract:
    Impedance pneumography is a technique that allows the monitoring of respiratory activity through the measurement of variations in the impedance between two points located on the thoracic surface. In this paper, a low-cost, easily portable, and re-configurable measurement system is presented, suitable to perform impedance pneumography investigations, based on virtual instrumentation employing a data acquisition card controlled through a LabVIEW program. A possible approach for a metrological characterization of the system is proposed, showing a base uncertainty of the order of 0,4 % in the measurement of the resistive part of the impedance, in the range of interest. Some preliminary investigations have been performed in order to assess the influence on measured trans-thoracic impedance both of the kind of electrodes adopted for current injection and simultaneous voltage measurement and of the frequency of injected sinusoidal currents. Finally, acquisitions made on a volunteer are presented, evidencing the feasibility of the proposed system in monitoring the breath activity of a patient and in extrapolating relevant diagnostic parameters.
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  • DOI:
    _unreg_tc4-2008.105

Event details:

  • IMEKO TC:
    TC4
  • Event name:
    Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
  • Title:
    XVIth IMEKO TC4 International Symposium on Electrical Measurements and Instrumentation (together with 13th IMEKO TC4 Workshop on ADC Modelling and Testing)
  • Place:
    Florence, ITALY
  • Time:
    22 September 2008 - 24 September 2008