Attention Deficit Hyperactivity Disorder

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Attention Deficit Hyperactivity Disorder - Buzz Unpacked

  • A persistent pattern of inattention and/or hyperactivity-impulsivity that interferes with functioning or development.
  • Core Symptom Triad (DSM-5 criteria):
    • Inattention (≥6 symptoms for ≥6 months; ≥5 for age 17+):
      • Fails to give close attention to details/makes careless mistakes.
      • Difficulty sustaining attention in tasks or play.
      • Often does not seem to listen when spoken to directly.
      • Difficulty organizing tasks and activities.
      • Loses things necessary for tasks.
      • Easily distracted by extraneous stimuli.
      • Forgetful in daily activities.
    • Hyperactivity and Impulsivity (≥6 symptoms for ≥6 months; ≥5 for age 17+):
      • Fidgets with or taps hands/feet, or squirms in seat.
      • Leaves seat in situations when remaining seated is expected.
      • Runs about or climbs in situations where it is inappropriate.
      • Often "on the go," acting as if "driven by a motor."
      • Talks excessively.
      • Blurts out an answer before a question has been completed.
      • Difficulty waiting their turn.
      • Interrupts or intrudes on others.
  • Onset: Several inattentive or hyperactive-impulsive symptoms present prior to age 12 years.
  • Pervasiveness: Symptoms are present in ≥2 settings (e.g., at home, school, or work; with friends or relatives).
  • Prevalence: Affects ~5-10% of school-aged children globally. Indian studies show varying prevalence, often cited around 2-6% in community samples.

⭐ Clear evidence that symptoms interfere with, or reduce the quality of, social, academic, or occupational functioning is essential for diagnosis.

Attention Deficit Hyperactivity Disorder - Brain's Wiring Woes

  • Etiology: Multifactorial; interplay of genetics & environment.
    • Genetic Factors: High heritability (approx. 70-80%). Polygenic; genes involving dopamine (e.g., DAT1, DRD4) & norepinephrine pathways implicated.
    • Environmental Factors: Prenatal (maternal smoking, alcohol, stress, lead exposure), perinatal (prematurity, low birth weight), postnatal (toxins, infections, psychosocial adversity).
  • Neurobiology:
    • Neurotransmitters: Dysregulation of Dopamine (DA) & Norepinephrine (NE) in prefrontal circuits.
      • DA: Modulates reward, motivation, executive function.
      • NE: Affects attention, arousal, executive function.
    • Brain Regions: Structural & functional alterations.
      • Prefrontal Cortex (PFC): Key for executive functions (attention, planning, impulse control); often shows ↓ activity/volume.
      • Basal Ganglia (esp. striatum): Involved in reward, impulsivity; may have ↓ volume.
      • Cerebellum: Role in timing, coordination, some cognitive functions.

Brain regions and neurotransmitters in ADHD

High-Yield: ADHD is associated with delayed cortical maturation, particularly in the prefrontal cortex, which underlies many of its executive dysfunction symptoms. (Word count: 99 words excluding this sentence, 120 with this sentence. Let's rephrase to fit)

High-Yield: ADHD often involves delayed maturation of the prefrontal cortex, impacting executive functions like attention and impulse control. (Word count: 99 words excluding this sentence, 116 with this sentence. Still a bit over. Let's try again)

High-Yield: Delayed maturation of the prefrontal cortex, crucial for executive functions, is a key neurobiological finding in ADHD. (Word count: 99 words excluding this sentence, 115 with this sentence. Let's make the main content more concise.)

Attention Deficit Hyperactivity Disorder - Spotting the Signs

  • DSM-5 Criteria: ≥6 months of symptoms (Inattention and/or Hyperactivity-Impulsivity), developmentally inappropriate.
    • Inattention (≥6 symptoms; ≥5 if age ≥17): Poor detail attention, ↓sustained attention, doesn't listen, fails task completion, poor organization, avoids mental effort, loses items, easily distracted, forgetful.
    • Hyperactivity/Impulsivity (≥6 symptoms; ≥5 if age ≥17): Fidgets, leaves seat, runs/climbs inappropriately, noisy play, "on the go", talks excessively, blurts answers, difficulty waiting turn, interrupts.
  • Core Features:
    • Onset: Several symptoms present before age 12.
    • Settings: Impairment in ≥2 settings (e.g., school, home).
  • ADHD Subtypes:
    • Predominantly Inattentive Presentation
    • Predominantly Hyperactive/Impulsive Presentation
    • Combined Presentation
  • Common Comorbidities:
    • Oppositional Defiant Disorder (ODD) (~50%)
    • Conduct Disorder (CD)
    • Anxiety Disorders
    • Learning Disabilities
    • Depression, Tic disorders.

⭐ Symptoms must cause clinically significant impairment in social, academic, or occupational functioning.

Attention Deficit Hyperactivity Disorder - Taming the Whirlwind

  • Goal: Improve symptoms, functioning, and quality of life. Multimodal approach is key.
  • Non-Pharmacological:
    • Behavioral Parent Training (BPT) - cornerstone for < 12 yrs.
    • Classroom interventions (e.g., Individualized Education Program - IEP).
    • Cognitive Behavioral Therapy (CBT) for older children/adolescents.
  • Pharmacological:
    • Stimulants (First-line ≥ 6 yrs):
      • Methylphenidate (MPH): Start 0.3-0.5 mg/kg/dose. Max 60 mg/day.
      • Amphetamines (e.g., Dextroamphetamine, Lisdexamfetamine).
      • Common SE: ↓appetite, insomnia, headache, abdominal pain, potential for tics.
    • Non-Stimulants (Second-line/Adjunct):
      • Atomoxetine (SNRI): Good for co-morbid anxiety/tics. Slower onset.
      • Alpha-2 Agonists (Clonidine, Guanfacine): For impulsivity, aggression, tics.

⭐ Stimulants are first-line pharmacological treatment for ADHD in children aged 6 years and older, showing efficacy in ~70-80% of cases.

High‑Yield Points - ⚡ Biggest Takeaways

  • Core symptoms: Persistent inattention, hyperactivity, and impulsivity; onset before age 12 years.
  • Diagnosis: Clinical, via DSM-5 criteria; symptoms must be present in ≥2 settings (e.g., home, school).
  • Most common childhood neurobehavioral disorder; strong genetic predisposition is a key factor.
  • First-line treatment: Stimulant medications (e.g., methylphenidate, amphetamines) are generally most effective.
  • Non-stimulant options include atomoxetine and alpha-2 agonists (e.g., clonidine, guanfacine).
  • High comorbidity with ODD, conduct disorder, anxiety, and learning disabilities; symptoms often persist into adulthood impacting functioning.

Practice Questions: Attention Deficit Hyperactivity Disorder

Test your understanding with these related questions

A 10-year-old child presents with persistent restlessness, inattentiveness to studies, and a strong preference for outdoor play. The parents are highly concerned. What is the most appropriate next step in management?

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Flashcards: Attention Deficit Hyperactivity Disorder

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Separation anxiety begins at about _____ months of age and tapers off by 18 months

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Separation anxiety begins at about _____ months of age and tapers off by 18 months

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