[13] Autism Flashcards
What is autism?
Autism is a pervasive developmental disorder
What is autism characterised by?
- Impairment in social interaction
- Impairment in communication
- Restricted, stereotyped interests and behaviours
What can the aetiology of autism be divided into?
- Prenatal
- Antenatal
- Postnatal
What are the pre-natal factors in the development of autism?
- Genetics
- Parental age
- Drugs
- Infection
What is the role of genetics in the development of autism?
There is a complex polygenetic relationship, with a number of chromosomes implicated, such as chromosome 7
There is a significantly increased risk of autism associated with genetic syndromes such as fragile X syndrome and tuberous sclerosis
How is parental age involved in the development of autism?
A study found that women who are 40 years old have a 50% greater chance of having a child with autism compared with women 20-29 years
How are pre-natal drugs involved in the development of autism?
Babies who have been exposed to certain medications in the womb have a greater risk of developing autism, including sodium valproate in particular
How is pre-natal infection involved in the development of autism?
Prenatal viral infections, e.g. rubella, increase the risk of autism
What are the antenatal factors in the developmen of autism?
- Obstetic complications such as hypoxia during childbith
- Reduced gestational age at birth (before 35 weeks gestation)
- Very low birthweight
What postnatal factors are involved in the development of autism?
- Toxins such as lead and mercury may increase the risk of autism
- Pesticide exposure may affect those genetically predisposed to autism
What % of the population are affected by autism?
1.1%
What are the risk factors for autism?
- Male gender
- Genetics/family history
Advancing parental age - Parental psychiatric disorders
- Prematurity
- Maternal medication use
What can the symptoms of autism described in the ICD-10 be divided into?
- Asocial features
- Restricted behaviour
- Impaired communication
What are the asocial symptoms of autism?
- Few social gestures, e.g. waving, nodding, and pointing at objects
- Lack of eye contact, social smile, response to name, interest in others, emotional expression, sustained relationships, and awareness of social rules
What are the behaviour restriction symptoms of autism?
- Restricted, repetitive, and stereotyped behaviour, e.g rocking and twisting
- Upset at any change in daily routine
- May prefer the same foots, insist on the same clothes, and play the same games
- Obsessively persued interests
- Fascination with sensory aspects of environment
What are the communication symptoms of autism?
- Distorted or delayed speech
- Echolalia
What is echolalia?
Repetition of words
What % of patients notice signs of autism by 12-18 months of age?
50%
What age should the onset of autism occur before?
3
Can autism be diagnosed if the onset is after 3?
There is an atypical autism that can be diagnosed after 3
Other than those described in the ICD-10, what are the features of autism?
- Intellectual disability
- Temper tantrums
- Impulsivity
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Do all patients with autism have intellectual disability?
No - if you include all on the autistic spectrum, the majority will not have an intellectual disability
What conditions are associated with autism?
- Epileptic seizures
- Visual impairment
- Hearing impairmnt
- Infections
- Pica (eating inedible objects)
- Constipation
- Sleep disorders
- Underlying medical conditions
- Psychiatric conditions