Acoustic Impedance Measurement in the Study of Patients with Spasmodic Dysphonia

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Abstract
The use of acoustic impedance measurement for the study of middle ear muscle dysfunction in patients with spasmodic dysphonia is advocated. Preliminary data reported here provide evidence of a high incidence of apparent middle ear muscle dysfunction in these patients. The findings appear to add further support to the theory of neurogenic dysfunction in spasmodic dysphonia. Observations of possible problems in muscle relaxation in some patients and tremor of the middle ear muscle(s) in others are interpreted as being suggestive of neurologic involvement of the extrapyramidal motor system.

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