Spasmodic (Laryngeal) Dysphonia
Spasmodic dysphonia (SD) is an adult-onset focal dystonia characterized by abnormal vocal cord contractions activated by speech. There are three forms of spasmodic dysphonia. The commonest form, making up about 90% of cases, is adductor dysphonia in which spasmodic adduction of the vocal cords causes interruptions in phonation called voice breaks. Because of this, the resultant closed glottis speech is highly strained, effortful, high-pitched, and reduced in volume. Whispering is often normal. The second most common type is abductor dysphonia in which patients have a breathy voice with aphonic interruptions occurring in the middle of a word. These typically occur when phonating a vowel right after a voiceless consonant such as a p, f, s, t, or h.
KeywordsVocal Cord Focal Dystonia Spasmodic Dysphonia Voice Therapy Thyroarytenoid Muscle
Spasmodic (laryngeal) dyphonia.mp4 (MP4 17,298KB)
Patient exhibits a staccato style voice pattern. She can whisper and sing relatively normally.