(SD; Adductor Laryngeal Breathing Dystonia (ABLD); Adductor Spasmodic Dysphonia; Abductor Spasmodic Dysphonia; Dysphonia, Episodic Laryngeal Dyskinesia; Laryngeal Dystonia; Spastic Dysphonia)
Spasmodic dysphonia (SD) is a voice disorder. The muscles of the throat freeze or go into spasms. Words are strangled and strained or they don’t get out at all. Sounds are also distorted.
The main types of SD include:
- Adductor spasmodic dysphonia—spasms cause muscles to stiffen and close
- Abductor spasmodic dysphonia—spasms cause muscles to spastically open
- Mixed spasmodic dysphonia
|Spasmodic dysphonia affects the throat muscles.
|Copyright © Nucleus Medical Media, Inc.
Often, the exact cause of SD is unknown. It is a disorder of the central nervous system. The areas of the brain that control these muscle movements are deep within the brain.
This condition is more common in women and people who are between 30 and 50 years of age.
Factors that may increase your chance of developing SD include:
Degenerative brain diseases such as
amyotrophic lateral sclerosis
Another movement disorder such as
- Family history of SD—In some families, a gene on chromosome 9 may be connected to SD.
Brain infection such as
- Exposure to toxins or certain medications such as phenothiazines
Symptoms of SD include:
- Squeaky, strained speech
- No speech at all
- Speech with the wrong pitch and tone
- Breaks in speech
- Breathy voice
You will be asked about your symptoms and medical history. A physical exam will be done.
Imaging tests evaluate the throat or other structures. These may include:
You may be referred to a team of specialists, including:
- Neurologist—to evaluate your brain function
- Speech pathologist—to evaluate your speech and how it’s produced
- Otolaryngologist—to evaluate your vocal cords
Talk with your doctor about the best treatment plan for you. Treatment options include the following:
- Medication—to increase dopamine, a chemical in the brain that influences muscle movement
- Botulinum toxin injections—to reduce muscle spasms
- Speech therapy techniques—to relax muscles
- Brain stimulation—to prevent muscles from freezing and going into spasm
- Counseling—to help deal with the condition
- Surgery in severe cases—to cut or remove a nerve that is connected to the vocal cords
There are no current guidelines to prevent SD because the cause is not known.
American Speech-Language-Hearing Association
National Spasmodic Dysphonia Association
Ontario Association of Speech-Language Pathologists and Audiologists
Speech-Language and Audiology Canada
Daniilidou, P, Carding P, Wilson, J, Drinnan, M, Deary, V. Cognitive behavioral therapy for functional dysphonia.
Ann Otol Rhinol Laryngol. 2007;116(10):717-722.
Diagnosis. National Spasmodic Dysphonia Association website. Available at:
http://www.dysphonia.org/diagnosis.php. Accessed November 26, 2014.
Rosow DE, Parikh P, Vivero RJ, Casiano RR, Lundy DS. Considerations for initial dosing of botulinum toxin in treatment of adductor spasmodic dysphonia. Otolaryngol Head Neck Surg. 2013;148(6):1003-1006.
Spasmodic dysphonia. American Speech-Language-Hearing Association website. Available at:
http://www.asha.org/public/speech/disorders/SpasmodicDysphonia.htm. Accessed November 26, 2014.
Spasmodic dysphonia. National Institute on Deafness and Other Communicative Disorders website. Available at:
http://www.nidcd.nih.gov/health/voice/Pages/spasdysp.aspx. Updated October 2010. Accessed November 26, 2014.