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Updated: Oct 30, 2025
08:32
Adapting Human Videofluoroscopic Swallow Study Methods to Detect and Characterize Dysphagia in Murine Disease Models
Published on: March 1, 2015
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Rheological Issues on Oropharyngeal Dysphagia
Crispulo Gallegos1, Mihaela Turcanu2, Getachew Assegehegn2
1Product and Process Engineering Center, Fresenius Kabi Deutschland GmbH, Daimlerstrasse 22, 61352, Bad Homburg, Germany. crispulo.gallegos-montes@fresenius-kabi.com.
Dysphagia
|July 3, 2021
Summary
Rheology is crucial for designing safe swallowing fluids for dysphagia. Understanding both shear and extensional viscosity helps predict safe swallowing and manage oropharyngeal dysphagia (OD).
Area of Science:
- Rheology and its application in clinical diagnostics and fluid dynamics.
Background:
- Clinical evidence suggests increased bolus viscosity reduces airway penetration during swallowing.
- Objective viscosity levels for safe swallowing prediction are not yet established.
- Bolus extensional viscosity is increasingly recognized for its role in swallowing dynamics.
Purpose of the Study:
- To review the significance of rheology in diagnosing and managing oropharyngeal dysphagia (OD).
- To introduce experts in dysphagia to basic rheological concepts, including shear and extensional viscosity.
Main Methods:
- Definition of fundamental rheological concepts: shear and extensional viscosity.
- Overview of relevant shear and elongational rheometrical techniques for dysphagia fluids.
- Analysis of current knowledge on rheology's role in OD diagnosis and management.
Main Results:
- Exploration of shear and elongational behaviors of dysphagia-oriented products and contrast fluids.
- Discussion on the influence of saliva on bolus rheological properties during swallowing.
Conclusions:
- Rheology, encompassing both shear and extensional viscosity, is vital for objective assessment and management of OD.
- Further research is needed to define specific viscosity parameters for safe swallowing.
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