Abductory spasmodic dysphonia (AB-SD)

A benign neurological voice disorder caused by laryngeal dystonia. Abductory SD interferes with smooth flow of the voice as follows: During running speech, the voice intermittently drops out to a whisper. AB-SD is also called intermittent whisper phonation, and comprises about 10% of all cases of spasmodic dysphonia. See also tonic variant spasmodic dysphonia.

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