It is commonly reported by people with spasmodic dysphonia that symptoms almost only occur on vocal sounds that require phonation. These phonation breaks have been compared to stuttering in the past, but there is a lack of research in support of spasmodic dysphonia being classified as a fluency disorder. Gradual onset can begin with the manifestation of a hoarse voice quality, which may later transform into a voice quality described as strained with breaks in phonation. They can come and go for hours or even weeks at a time, or remain consistent. Symptoms of spasmodic dysphonia can come on suddenly or gradually appear over the span of years. In some, work and social life are affected. Onset is typically between the ages of 30 and 50. The disorder affects an estimated 2 per 100,000 people.
If this is not effective, surgery may be considered however, evidence to support surgery is limited. Other measures include voice therapy, counselling, and amplification devices. This generally results in improvement for a few months. Most commonly this involves injecting botulinum toxin into the affected muscles of the larynx. While there is no cure, treatment may improve symptoms. Diagnosis is typically made following examination by a team of healthcare providers. The underlying mechanism is believed to typically involve the central nervous system, specifically the basal ganglia.
Triggers may include an upper respiratory infection, injury to the larynx, overuse of the voice, and psychological stress. Onset is often gradual and the condition is lifelong. The person's voice may also sound strained or they may be nearly unable to speak.
This results in breaks or interruptions in the voice, often every few sentences, which can make a person difficult to understand. Spasmodic dysphonia, also known as laryngeal dystonia, is a disorder in which the muscles that generate a person's voice go into periods of spasm. Breaks in the voice making a person difficult to understand Įxamination by a team of healthcare providers īotulinum toxin into the affected muscles, voice therapy, counselling, amplification devices
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