Tonic Variant Spasmodic Dysphonia
“Pure” tonic-variant adductory Spasmodic Dysphonia
Four subtypes of adductor SD, tonic variant
Stage Whisper Variant
Vocal Fry Variant
AD-SD | Tonic Variant
Adductory spasmodic dysphonia is a variant of spasmodic dysphonia in which the spasms push the vocal cords together, choking off or straining the voice. There are two variants of adductory spasmodic dysphonia: classic and tonic. In the tonic variant, the adductory spasms are more constant and sustained than intermittent, so that instead of interrupting the person’s speech, the spasms cause a constant strained or “tight” vocal quality.