Spasmodic Dysphonia
En Español (Spanish Version)

Definition
Spasmodic dysphonia (SD) is a voice disorder. It occurs when 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.

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
Throat

Spasmodic dysphonia affects the throat muscles.
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Causes
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.

Risk Factors
Factors that may increase your chance of developing SD include:

  • Degenerative brain diseases such as amyotrophic lateral sclerosis
  • Another movement disorder such as tardive dyskinesia
  • Family history of SD—In some families, a gene on chromosome 9 may be connected to SD.
  • Brain infection such as encephalitis
  • Exposure to toxins or certain medications such as phenothiazines
  • Gender: female
  • Age: between 30-50
Symptoms
Symptoms of SD include:

  • Squeaky, strained speech
  • No speech at all
  • Speech with the wrong pitch and tone
  • Breaks in speech
  • Breathy voice
Diagnosis
You will be asked about your symptoms and medical history. A physical exam will be done.

Images may be taken of your bodily structures. This can be done with:

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
Treatment
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
Prevention
Since the causes are unknown, it is difficult to prevent SD.




RESOURCES:
American Speech-Language-Hearing Association

National Spasmodic Dysphonia Association

CANADIAN RESOURCES:
Ontario Association for Speech-Language Pathologists and Audiologists

Speech-Language & Audiology Canada

References:
Daniilidou, P, Carding P, Wilson, J, Drinnan, M, Deary, V. Cognitive behavioral therapy for functional dysphonia. Annals of Otology, Rhinology & Laryngology. 2007;116:717-722.

Diagnosis. National Spasmodic Dysphonia Association website. Available at: http://www.dysphonia.org/diagnosis.php. Accessed February 17, 2014.

Rosow DE, Parikh P, et al. Considerations for initial dosing of botulinum toxin in treatment of adductor spasmodic dysphonia. Otolaryngol Head Neck Surg. 2013; 148(6):1003-6.

Spasmodic dysphonia. American Speech-Language-Hearing Association website. Available at: http://www.asha.org/public/speech/disorders/SpasmodicDysphonia.htm. Accessed February 17, 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 February 17, 2014.

Last Reviewed February 2014



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