Selective mutism — formative SAQs

SAQ 1 (10)

A 6-year-old girl is referred because her teacher reports she has "never heard her voice all year", yet her mother describes a cheerful chatterbox at home. The child speaks freely to one younger cousin but not to any adult outside the family. She hides behind her mother in clinic and produces no speech, though she nods and points. [14]

1. Define selective mutism using the DSM-5-TR framework and the setting-specificity principle. (3) [14] [3]
2. List the key differential diagnoses and the single mandatory investigation before settling on an anxiety diagnosis. (4) [14] [11]
3. Outline your initial assessment plan and the first-line management. (3) [14] [5]

Model answer

Definition. Selective mutism is a consistent failure to speak in specific social situations where speech is expected (such as school), despite speaking in other situations (such as home), present for at least one month (not limited to the first month of school), that interferes with educational or social communication and is not better explained by a communication disorder, lack of comfort with the spoken language, autism, schizophrenia or another psychotic disorder. The setting-specificity — fluent speech at home versus silence at school — is the diagnostic hook and reflects an anxiety-driven freeze rather than defiance. [14] [3]

Differentials and mandatory investigation. Normal shyness (resolves, no impairment); social anxiety disorder (the dominant comorbidity and conceptual relative); autism spectrum (communication deficit across ALL settings); hearing loss or glue ear (quiet in ALL settings); developmental language disorder; trauma or abuse (acute, context-bound silence); and a new-language comfort period in bilingual or migrant children. The single mandatory investigation is a hearing assessment — a child silent from undiagnosed hearing loss must never be labelled with an anxiety disorder. [14] [11]

Assessment plan and first-line management. Multi-informant history (child without pressure, parent about home speech, structured teacher report), map the speaking gradient across every setting, confirm hearing and spoken-language adequacy, and screen comorbidity and safeguarding. First-line management is psychoeducation (anxiety, not defiance) plus collaborative behavioural intervention — stimulus fading, shaping, positive reinforcement and defocused communication delivered with the school — with removal of pressure to speak. [14] [5]

SAQ 2 (10)

A 9-year-old with confirmed moderate selective mutism has had only a partial response to three months of school-based behavioural intervention. She has prominent comorbid social anxiety but no suicidality or bipolar history. The family and school are engaged. [5]

1. Outline the stepped pharmacotherapy decision and justify adding an SSRI. (3) [5] [13] [1]
2. Give an SSRI framework and the monitoring you will provide. (4) [1] [13]
3. Describe how you define treatment response and the refractory pathway. (3) [13] [14]

Model answer

SSRI decision. For moderate selective mutism with a partial behavioural response and significant comorbid social anxiety, combine continued behavioural intervention with an SSRI such as fluoxetine or sertraline. Behavioural intervention remains first-line and is not substituted by medication; the SSRI is added because the moderate-severity, comorbid picture justifies pharmacotherapy alongside the behavioural pillar. The Black and Uhde double-blind RCT and the Dummit open trial anchored fluoxetine as the most-studied agent. [5] [13] [1]

SSRI framework and monitoring. Start low and titrate toward response over weeks to an adequate dose (confirm local product information). Monitor for activation, sleep disturbance, appetite and weight change, mood change and suicidal ideation early and after each dose change (youth suicidality warning); document baseline suicidality and screen for a personal or family history of mania before starting. Sustained behavioural intervention and school collaboration continue in parallel. [1] [13]

Response and refractory pathway. Define response by function — speech generalising from home into school and to peers, school participation, friendships and mood — rather than by a single clinic utterance. If refractory after an adequate behavioural trial and SSRI optimisation, intensify behavioural care, optimise SSRI dose and duration, and refer to specialist child and adolescent mental health services with a coordinated school plan. [13] [14]