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Published in: Dysphagia 4/2020

Open Access 01-08-2020 | Dysphagia | Original Article

The Swallowing Characteristics of Thickeners, Jellies and Yoghurt Observed Using an In Vitro Model

Authors: Simmi Patel, William J. McAuley, Michael T. Cook, Yi Sun, Shaheen Hamdy, Fang Liu

Published in: Dysphagia | Issue 4/2020

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Abstract

Drinks and foods may be thickened to improve swallowing safety for dysphagia patients, but the resultant consistencies are not always palatable. Characterising alternative appetising foods is an important task. The study aims to characterise the in vitro swallowing behaviour of specifically formulated thickened dysphagia fluids containing xanthan gum and/or starch with standard jellies and yoghurt using a validated mechanical model, the “Cambridge Throat”. Observing from the side, the model throat can follow an experimental oral transit time (in vitro-OTT) and a bolus length (BL) at the juncture of the pharynx and larynx, to assess the velocity and cohesion of bolus flow. Our results showed that higher thickener concentration produced longer in vitro-OTT and shorter BL. At high concentration (spoon-thick), fluids thickened with starch-based thickener showed significantly longer in vitro-OTT than when xanthan gum-based thickener was used (84.5 s ± 34.5 s and 5.5 s ± 1.6 s, respectively, p < 0.05). In contrast, at low concentration (nectar-like), fluids containing xanthan gum-based thickener demonstrated shorter BL than those of starch-based thickener (6.4 mm ± 0.5 mm and 8.2 mm ± 0.8 mm, respectively, p < 0.05). The jellies and yoghurt had comparable in vitro-OTT and BL to thickeners at high concentrations (honey-like and spoon-thick), indicating similar swallowing characteristics. The in vitro results showed correlation with published in vivo data though the limitations of applying the in vitro swallowing test for dysphagia studies were noted. These findings contribute useful information for designing new thickening agents and selecting alternative and palatable safe-to-swallow foods.
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Metadata
Title
The Swallowing Characteristics of Thickeners, Jellies and Yoghurt Observed Using an In Vitro Model
Authors
Simmi Patel
William J. McAuley
Michael T. Cook
Yi Sun
Shaheen Hamdy
Fang Liu
Publication date
01-08-2020
Publisher
Springer US
Published in
Dysphagia / Issue 4/2020
Print ISSN: 0179-051X
Electronic ISSN: 1432-0460
DOI
https://doi.org/10.1007/s00455-019-10074-1

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