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The Impact of Rheologically Controlled Materials on the Identification of Airway Compromise on the Clinical and Videofluoroscopic Swallowing Examinations

Abstract

Numerous studies have suggested that the clinical evaluation of swallowing fails to adequately identify those patients who aspirate or do not aspirate on a videofluoroscopic swallowing examination. These conclusions, however, are based on comparisons between swallowed materials that were not rheologically matched. The present study used a battery of rheologically matched test materials, involving thin and thick liquids and cohesive and adhesive semisolids. Using these test items, results from a clinical swallow evaluation were compared to the results of a videofluorographic evaluation using identical test materials. Results suggest that the use of three test materials, including thin and thick liquids given in volumes of 5 and 10 ml, demonstrated the strongest associations between cough on the clinical examination and aspiration on the videofluoroscopic examination.

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Acknowledgments

The authors thank Amy Harju, M.A., R.D., for her help in providing test stimuli from the sensory panels and dietitians in the greater Minneapolis area; Don Tymchuck of Med-Diet Laboratories, Inc., for his inspiration and guidance to begin this work; and Cynthia DuBose, M.A., for her assistance in data collection. This study was supported by a grant from the Sota-Tec Foundation.

Author information

Correspondence to Michael E. Groher PhD.

Appendix

Appendix

Table 3 Appendix 1. Formulae for the preparation of liquid viscosities
Table 4 Appendix 2. Formulae for the cohesive and adhesive test samples

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Groher, M.E., Crary, M.A., Carnaby (Mann), G. et al. The Impact of Rheologically Controlled Materials on the Identification of Airway Compromise on the Clinical and Videofluoroscopic Swallowing Examinations. Dysphagia 21, 218–225 (2006). https://doi.org/10.1007/s00455-006-9046-3

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Keywords

  • Dysphagia
  • Aspiration
  • Clinical swallowing examination
  • Videofluoroscopic examination
  • Rheology
  • Deglutition
  • Deglutition disorders