In-depth Notes on Attention-Deficit/Hyperactivity Disorder (ADHD)

Attention-deficit/hyperactivity disorder (ADHD)

  • Definition: ADHD is characterized by persistent symptoms of inattention, hyperactivity, and impulsivity, sufficient to impair major life activities.

    • Neurodevelopmental disorder: There are no distinct physical characteristics, but neuroimaging (fMRI scans) shows differences between ADHD and non-ADHD brains.

Key Symptoms of ADHD

Inattention

  • Symptoms include difficulties sustaining attention, sticking to tasks, following instructions, and resisting distractions.

Hyperactivity-Impulsivity

  • Hyperactivity: Inability to delay gratification, fidgeting, excessive talking, and difficulty remaining seated.

  • Impulsivity: Difficulty controlling responses, disorganization, impatience, and irritability.

DSM-5-TR Diagnostic Criteria

  • Persistent inattention/hyperactivity-impulsivity that interferes with functioning or development:

    • Symptoms present before age 12.

    • Symptoms observed in two or more settings (home, school).

    • Symptoms clearly impact social, academic, or occupational functioning.

    • Symptoms not better explained by other mental disorders (e.g., schizophrenia).

Assessment of ADHD

  • Methods:

    • Structured Clinical Interview for DSM-5.

    • Rating scales from teachers, parents, and other informants.

    • Measures of executive functioning.

    • Barkley Screening Checklist.

Presentation Types

  • ADHD-PI (Predominantly Inattentive): Focusing issues, forgetfulness, disorganization.

  • ADHD-HI (Predominantly Hyperactive-Impulsive): Difficulty controlling behavior, higher aggression.

  • ADHD-C (Combined Presentation): Most common type seen for treatment.

Impaired Executive Functions

  • Difficulties with:

    • Organization: Trouble starting and organizing tasks.

    • Attention: Losing focus, forgetfulness.

    • Regulation of effort: Excessive drowsiness, slow task completion.

    • Emotion regulation: Easily irritated, sensitive to criticism.

    • Working memory: Other cognitive tasks are often challenging.

Impaired Academic Functioning

  • Lower productivity, grades, and achievement test scores.

  • Commonly placed in special education due to learning disabilities (up to 45%).

Additional Concerns

  • High rates of sleep disturbances (up to 70%).

  • Increased rates of accidents and early initiation of risk behaviors (smoking, substance use).

  • Peer concerns: Often face rejection by peers; however, positive friendships can help.

Self-Perceptions

  • Distorted self-perceptions:

    • Positive illusory bias in hyperactive children.

    • Lower self-esteem in inattentive children.

Effects on the Family

  • Parents may exhibit higher levels of control, more negative parent-child interactions, depression, and increased parenting stress.

Comorbid Conditions

  • Oppositional Defiant Disorder: 50% of children with ADHD may meet criteria by age 7.

  • Anxiety and Mood Disorders: 25%-50% experience anxiety, with 20%-30% experiencing depression.

  • Developmental Coordination Disorder: 30%-50% display motor coordination issues.

Demographic Associations

  • Prevalence: Estimated diagnostic prevalence of 5-9%, more frequent in boys (6:1 ratio).

  • Under-recognition in girls and variation in prevalence among different socioeconomic statuses.

Course and Outcomes

  • Symptoms may be evident as early as birth, often diagnosed around age 4.

  • Many symptoms worsen in adolescence; challenges can persist into adulthood.

Genetic and Environmental Influences

  • ADHD has a strong hereditary component; influenced by factors affecting nervous system development (e.g., maternal substance use).

Neurochemical Findings

  • ADHD involves changes in neural networks, implicating dopamine and norepinephrine deficiencies.

Diet and Environmental Factors

  • Sugar does not cause hyperactivity; ADHD may relate to allergens and environmental toxins like lead.

Primary Treatment Approaches

  • Medication: Stimulants such as Adderall.

  • Parent Management Training: Strategies to reduce child behavior issues.

  • Educational Interventions: Support in academic settings.

Controversy Surrounding Medication

  • Stimulant use has increased significantly since the '90s; however, there are issues surrounding appropriate usage.

The MTA Study (Multimodal Treatment Study)

  • Studied various treatment approaches but found that medication management was most effective in reducing symptoms of ADHD.