Adductory spasmodic dysphonia (AD-SD)

A benign neurological voice disorder caused by laryngeal dystonia. Typically, during running speech, the voice is interrupted by sudden choking off of the voice, and there may be an underlying more continuous “tight” sound to the voice as well. Also called strain-strangle phonation. AD-SD comprises about 90% of cases of spasmodic dysphonia. Also exists in the less common tonic variant spasmodic dysphonia.

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