Electrical bioimpedance measurement as a tool for dysphagia visualisation

[摘要] 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.

[学科分类] 肠胃与肝脏病学

[关键词] bioelectric phenomena;electric impedance measurement;biomedical measurement;medical disorders;electrical bioimpedance measurement;dysphagia visualisation;portable bioimpedance method;pharynx closure;swallowing;2-channel device;neck;injected currents;dysphagic subjects;bioimpedance waveforms;descending pressure sequence;pharyngeal manometry;bioimpedance measurement reliability;waveform feature correlation;dysphagia rehabilitation;frequency 40 kHz;frequency 70 kHz