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Related Experiment Videos

Identifying oesophageal contents using electrical impedance tomography

R A Erol1, Y Mangnall, A D Leathard

  • 1Department of Medical Physics and Clinical Engineering, University of Sheffield, Royal Hallamshire Hospital, UK.

Physiological Measurement
|November 1, 1995
PubMed
Summary

Electrical impedance tomography (EIT) can distinguish between liquids of different conductivities during swallowing. This study measured bolus transit times using EIT, finding an average of 320 ms.

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Area of Science:

  • Biomedical Engineering
  • Physiology

Background:

  • Swallowing is a complex physiological process crucial for nutrient intake and airway protection.
  • Electrical impedance tomography (EIT) is a non-invasive imaging technique that measures the distribution of electrical conductivity within a body region.

Purpose of the Study:

  • To investigate the feasibility of using real-time EIT to detect changes in conductivity during swallowing.
  • To assess the ability of EIT to differentiate between liquids of varying conductivities.
  • To determine bolus transit times using EIT.

Main Methods:

  • A Sheffield mark II real-time EIT system with a 16-electrode array was used.
  • Ten subjects swallowed four liquids with conductivities ranging from 0.03 mS cm-1 (water) to 35.8 mS cm-1 (salty soup).

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  • Region of interest curves were analyzed to calculate bolus transit times.

    • Main Results:

    • EIT successfully distinguished between conductive and non-conductive liquids during swallowing.
    • The average bolus transit time across all subjects and liquids was calculated to be 320 +/- 100 ms.
    • EIT provided real-time conductivity changes associated with the passage of different bolus types.

    Conclusions:

    • Real-time EIT is a viable method for monitoring swallowing dynamics.
    • EIT can differentiate liquids based on their conductivity, offering insights into bolus characteristics.
    • The study demonstrates the potential of EIT for assessing swallowing function and identifying potential abnormalities.