Electrical bioimpedance measurement as a tool for dysphagia visualisation

Chris J. Chester; Paul T. Gaynor; Richard D. Jones; Maggie-Lee Huckabee

Electrical bioimpedance measurement as a tool for dysphagia visualisation

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Author(s): Chris J. Chester ¹ ; Paul T. Gaynor ¹ ; Richard D. Jones ^{1, 2, 3} ; Maggie-Lee Huckabee ^{1, 2}
- Affiliations: 1: University of Canterbury, Christchurch, New Zealand;
  2: New Zealand Brain Research Institute, Christchurch, New Zealand;
  3: Canterbury District Health Board, Christchurch, New Zealand
Source: Volume 1, Issue 3, September 2014, p. 115 – 118
DOI: 10.1049/htl.2014.0067 , Online ISSN 2053-3713

Received 13/05/2014, Accepted 30/08/2014, Revised 28/08/2014, Published 25/09/2014

A non-invasive and portable bioimpedance method and a device for detecting superior to inferior closure of the pharynx during swallowing have been developed. The 2-channel device measures electric impedance across the neck at two levels of the pharynx via injected currents at 40 and 70 kHz. The device has been trialled on both healthy and dysphagic subjects. Results from these trials revealed a relationship (r = 0.59) between the temporal separation of the second peaks in the bioimpedance waveforms and descending pressure sequence in the pharynx as measured by pharyngeal manometry. However, these features were only clearly visible in the bioimpedance waveforms for 64% of swallows. Further research is underway to improve the bioimpedance measurement reliability and validate waveform feature correlation to swallowing to maximise the device's efficacy in dysphagia rehabilitation.

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