Tonic variant spasmodic dysphonia

A variant of spasmodic dysphonia in which the spasms (and their effect on the voice) are sustained rather than intermittent. Tonic variant spasmodic dysphonia is to be distinguished from classic variant spasmodic dysphonia.

Individuals with a tonic variant of adductor spasmodic dysphonia have a sustained strained-sounding voice. Individuals with a tonic variant of abductor spasmodic dysphonia have a voice that is more or less continuously breathy. Tonic variant spasmodic dysphonia goes undiagnosed or misdiagnosed far more frequently than does classic variant spasmodic dysphonia.


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Four subtypes of adductor spasmodic dysphonia, tonic variant :

Non dysphonic variant

Cry variant

Stage whisper variant

Vocal fry variant