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Journal of Speech, Language, and Hearing Research Vol.42 92-100 February 1999.
© American Speech-Language-Hearing Association
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Aerodynamic Characteristics of Tracheostomy Speaking Valves

An Updated Report

David J. Zajac 1
Lisa Fornataro-Clerici 2

Thomas A. Roop 3
1 University of North Carolina at Chapel Hill
2 The Medical Center Beaver, PA
3 University of Pittsburgh Medical Center Braddock, PA and Community College of Allegheny County Pittsburgh, PA

david_zajac{at}dentistry.unc.edu

Two analyses were conducted to define some aerodynamic properties of one-way speaking valves designed for use with the tracheotomized patient. In the first analysis, the resistance to airflow of six different valves was determined during steady-state flow testing at rates of .450, .500, and .550 l/s. Significant differences among the valves were established only at the lowest flow rate. All valves exhibited relatively low resistance in the range of nasal resistance reported for normal adults. In the second analysis, the aerodynamic integrity of the valves was assessed during repetition of the syllable /pa/ under a condition used to simulate tracheostomy speech production. Significant differences were found among the valves in terms of air loss occurring during the rise in pressure associated with the production of the consonant /p/. Valves with diaphragms open at atmospheric pressure consistently exhibited air loss. Average slope of the rise in pressure for one of the valves tested was significantly greater, suggesting increased work during speech production. The results of these analyses suggest that although the inspiratory resistance to airflow was similar among various one-way speaking valves, some valves exhibit air loss during speech production.

KEY WORDS: tracheostomy, one-way speaking valves, airway resistance, speech production

Submitted on January 22, 1998
Accepted on September 2, 1998


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Characteristics of tracheostomy phonation valves.
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[Abstract] [Full Text] [PDF]


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