A normal loud cough and normal laughter in a patient with a whispered voice demonstrate that vocal cord adduction and the entire laryngeal apparatus are intact, which is the positive sign of functional dysphonia. Speech and language therapy is the treatment of choice. Consensus recommendations for functional communication and voice disorders apply the same framework used in functional motor disorders: address illness beliefs, redirect self-directed attention, and retrain normal automatic voicing through symptomatic techniques within a supportive and explicitly non-judgemental therapeutic relationship.
Practical techniques exploit automatic voicing: eliciting voice from a cough, a hum, a throat clear or a laugh and shaping it into speech, working with pitch and airflow, and progressively transferring the recovered voice into conversation. Aids such as amplifiers reinforce the illness model and should be weaned rather than made permanent. Being discharged with the message that nothing is wrong is a common and damaging experience for these patients, and replacing it with a positive explanation of what is wrong and why it is reversible is itself part of treatment.
On the ABPN blueprint this maps to the Treatment and management axis, because the item tests selection of a therapy and the withdrawal of a counterproductive aid. Psychological treatment is a useful adjunct where there is comorbid anxiety or a maintaining psychosocial factor, but it is not a substitute for symptomatic voice therapy.
Incorrect Answers
- A. Botulinum toxin is used for adductor spasmodic dysphonia with a strained voice and voice breaks, not for functional whispering dysphonia.
- C. Surgery is indicated for structural or neurogenic cord pathology; her cords are normal and operating would risk iatrogenic harm.
- D. Prolonged voice rest and permanent amplification entrench the disorder and delay recovery of automatic voicing.
- E. Psychological therapy alone omits the symptomatic voice work that has the best evidence and imposes an unsupported aetiological formulation.
Testing Pearls
- A normal cough with a whispered voice proves intact vocal cord adduction.
- Speech and language therapy using automatic voicing is first-line for functional dysphonia.
- Elicit voice from cough, hum or laugh and shape it into conversational speech.
- Wean amplifiers and other aids rather than making them permanent.
- "Nothing is wrong" is a harmful message; give a positive explanation instead.
References
- Jankovic J, Mazziotta JC, Newman NJ, Pomeroy SL, editors. Bradley and Daroff's Neurology in Clinical Practice. 8th ed. Philadelphia, PA: Elsevier; 2022. p. 2084.
- Baker J, Barnett C, Cavalli L, Dietrich M, Dixon L, Duffy JR, et al. Management of functional communication, swallowing, cough and related disorders: consensus recommendations for speech and language therapy. J Neurol Neurosurg Psychiatry. 2021;92(10):1112-1125.
- Stone J. Functional neurological disorders: the neurological assessment as treatment. Pract Neurol. 2016;16(1):7-17.
