Autism Spectrum Disorder in Children
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Direct answer
Autism spectrum disorder is a neurodevelopmental condition defined by two DSM-5 domains: persistent deficits in social communication and interaction, plus restricted, repetitive patterns of behaviour, interests or sensory responding — present from the early developmental period and causing functional impairment. The red flags precede the diagnosis: no response to name, absent pointing and joint attention, no words by sixteen months and loss of acquired words in the second year, which is why structured screening with M-CHAT at eighteen and twenty-four months is standard practice. There is no medication for core autism; early, intensive behavioural and communication intervention changes the trajectory, and every child with a communication regression needs audiological assessment first.
What you must remember
- DSM-5 architecture: all three social-communication domains (social-emotional reciprocity, nonverbal communication, developing and maintaining relationships) plus at least two of four restricted-repetitive criteria (stereotypies, insistence on sameness, intense restricted interests, sensory hyper- or hypo-reactivity).
- Boys outnumber girls roughly four to one; severity is specified as levels 1–3, with or without intellectual disability — Asperger syndrome and PDD-NOS no longer exist as separate labels.
- Screening: M-CHAT-R at eighteen and twenty-four months; a positive screen is a referral for structured diagnostic evaluation, not a label.
- Regression occurs in a substantial minority, typically fifteen to twenty-four months — regression of any kind demands evaluation, including hearing and EEG where the pattern fits Landau-Kleffner syndrome.
- Associated conditions: epilepsy (commoner than in typical children, with peaks in early childhood and adolescence), intellectual disability, ADHD, anxiety, sleep disturbance and constipation.
- Genetic and syndromic associations: fragile X syndrome, tuberous sclerosis and Down syndrome carry raised risk — dysmorphism or regression prompts genetic referral; heritability is strong.
- The MMR-autism claim has been conclusively refuted and the paper retracted — delaying vaccination is harmful; prenatal valproate exposure is a genuine risk factor.
- Management is educational and behavioural: early intensive behavioural intervention, speech-language therapy, parent-mediated communication training, and individualised schooling with visual supports — intensity and early start predict better outcomes.
- Medication has no role in core features; risperidone and aripiprazole are used for severe irritability and aggression, melatonin for sleep problems, always alongside behavioural strategies.
- Every child diagnosed needs audiology, vision check and cognitive assessment, and a family plan including sibling guidance and respite.
A typical exam case
An eighteen-month-old is brought because he "does not talk". He does not respond to his name, does not point to show things, lines up cars and screams if the sequence is disturbed, and has begun flapping his hands; he walked at thirteen months. The correct sequence: apply M-CHAT-R (it will be positive), arrange formal audiological evaluation because any speech delay is hearing loss until excluded, and refer for structured multidisciplinary diagnostic assessment rather than issuing a label at the first visit. Once confirmed, the prescription is early intensive behavioural and communication intervention — twenty-plus hours per week of structured programme where resources allow — plus parent training and management of sleep and constipation.
The second scenario is the same child at three years, with a vocabulary of ten words used meaninglessly, who develops staring spells with eye flutter. Epilepsy is commoner in autism, and EEG plus paediatric neurology referral is indicated — recognising Landau-Kleffner syndrome when acquired language regression meets epileptiform sleep activity. The third scenario is the school-age boy with average intelligence, encyclopaedic knowledge of train timetables, literal language and friendship failure — level 1 autism without intellectual disability, managed with social-skills training, classroom accommodation and anxiety management.
Where students slip
Candidates blur autism with intellectual disability: the globally delayed child is behind in everything, whereas the autistic child is uneven — language and social interaction disproportionately affected, sometimes with preserved nonverbal problem-solving. Second, forgetting hearing assessment in every language concern. Third, over-medicalising: extensive metabolic and imaging work-ups without red flags for syndromes or seizures. Fourth, the vaccination trap — any answer implying a causal MMR-autism link is factually wrong. Finally, quoting "no treatment" — the accurate statement is no pharmacological treatment for core features, with behavioural intervention genuinely modifying outcome.
Frequently asked questions
What are the two core DSM-5 domains of autism spectrum disorder?
Persistent deficits in social communication and social interaction across all three subdomains, plus restricted and repetitive patterns of behaviour, interests or sensory responding, with early onset and functional impairment.
Which screening tool and schedule are used for autism in routine well-child care?
The Modified Checklist for Autism in Toddlers, Revised (M-CHAT-R), administered at eighteen and twenty-four months, with positive screens referred for structured diagnostic evaluation.
What developmental red flags in the second year warrant autism evaluation?
No response to name, absent pointing or joint attention, no single words by sixteen months, no two-word phrases by twenty-four months, poor eye contact, and loss of previously acquired words or social skills.
Is there any drug treatment for core autism?
No — medication does not treat core social-communication deficits; risperidone or aripiprazole help severe irritability and melatonin helps sleep, always alongside intensive behavioural and educational intervention.