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What Happens: Vocal folds come together (close) tightly at the wrong time during speech, making it difficult to produce voice Type 1: Adductor SD (Ad-SD) (80% to 95% of cases) Swallowing and breathing, the other important functions of the voice box, are almost never affected.SD is not a psychiatric or psychological disease.
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SD is a type of dystonia, a disorder of the central nervous system that causes involuntary movement of the vocal folds during voice production.These spasms interrupt normal voice (dysphonia) in “abrupt spurts” with a strained, strangled voice with breathy, soundless voice or with a mixture of both. Spasmodic dysphonia (SD) is a voice disorder resulting from involuntary movements (or spasms) of the voice box muscles.
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