Autism Spectrum Disorder - Introduction

Introduction to Autism Spectrum Disorders

Prevalence and Increase

  • The prevalence of autism spectrum disorder (ASD) has been increasing.
  • Currently, 1 in 59 children is diagnosed with ASD.
  • Factors contributing to the increase include:
    • Increased awareness, leading more parents to seek diagnosis.
    • Insurance coverage for services in all 50 states, incentivizing diagnostic evaluations.

Demographic Differences

  • Gender: Male children are four times more likely to be diagnosed with autism than female children.
  • Racial Groups: Slight differences exist, likely due to varying access to quality diagnostic and healthcare services.

Genetic Component

  • There is evidence suggesting a genetic component.
  • Identical twins are more likely to share an autism diagnosis compared to fraternal twins.
  • Siblings of children with autism have an increased risk of developing autism symptoms.
  • About 10% of children with autism also have a separate genetic disorder (e.g., Fragile X, Down syndrome).
  • Approximately 41% of children with autism are also diagnosed with an intellectual disability.
  • Note: A child with autism can also be highly intelligent.

Impact on Families and Healthcare System

  • The lifetime expense to care for an individual with autism is estimated to be approximately 3,200,0003,200,000.
  • Individuals with autism are likely to incur more expenses for medical care.
  • Early and high-quality intervention can lead to increased independence and self-sufficiency, resulting in potential cost savings of up to 2,000,0002,000,000 over their lifetime.

Definition of Autism

  • Autism is a pervasive developmental disorder affecting the development of certain skills beginning in early childhood.
  • It is a spectrum disorder, meaning it varies in severity and symptoms.
  • Autism is diagnosed based on behavioral characteristics and outward symptoms, not detectable physiologically unlike genetic disorders like Down syndrome.

Core Characteristics of Autism

  1. Persistent Deficit in Social Communication and Interactions

    • Delayed language
    • Difficulty establishing and maintaining social relationships
    • Lack of interest in others
    • Failure to make eye contact
    • Difficulty understanding others' perspectives

  2. Restricted or Repetitive Patterns of Behavior, Interests, or Activities

    • Repetitive, non-functional body movements or vocalizations (e.g., hand flapping, body rocking)
    • Repetitive sounds, words, or phrases
    • Strong desire for sameness; difficulty with changes, transitions, or unexpected events
    • These are general characteristics and do not describe every single individual diagnosed with autism spectrum disorder.

Early Signs of Autism

  • Typically, autism is not diagnosed until 18-24 months of age.
  • Early signs to watch for (note: presence of these signs does not confirm autism but warrants discussion with a physician):
    • Not responding to their name by 12 months of age.
    • Not pointing at objects to show interest.
    • Not playing pretend games (e.g., peekaboo).
    • Avoiding eye contact and wanting to be alone.
    • Having trouble understanding other people's feelings or talking about their own feelings.
    • Delayed speech and language skills.
    • Echolalia (repeating words or phrases over and over).
    • Giving unrelated answers to questions.
    • Becoming upset by minor changes.
    • Having obsessive or restrictive interests.
    • Repetitive body movements (stimming).
    • Having unusual reactions to sensory input.

Redefinition as a Spectrum Disorder

  • Autism now includes separate diagnoses previously considered distinct:
    • Asperger's Syndrome
    • Childhood Disintegrative Disorder
    • Pervasive Developmental Disorder Not Otherwise Specified (PDD-NOS)
  • These disorders now fall under different levels of severity within the autism spectrum.

Levels of Severity (DSM-5)

  • When a child is diagnosed with autism, the level of severity is also described:
    • Level 1: Requiring support
    • Level 2: Requiring substantial support
    • Level 3: Requiring very substantial support

Diagnosis

  • Autism is diagnosed by the presence of certain symptoms.
  • Symptoms must be persistent and present in early childhood (before age two).
  • Symptoms must meet a certain standard for severity, impairing the child's ability to function.
  • The disorder must not be better explained by another diagnostic conclusion.

Important Considerations

  • These are general criteria; every individual is unique.
  • Physicians and diagnosticians should evaluate each child individually to determine if they meet the criteria for an autism diagnosis and the level of severity.