## ADHD Presentation Classification ### DSM-5 ADHD Subtypes **Key Point:** ADHD is classified into three presentations based on which symptom domains predominate over the past 6 months: | Presentation | Inattention Symptoms | Hyperactivity-Impulsivity Symptoms | Clinical Features | |--------------|----------------------|-----------------------------------|------------------| | **Predominantly Inattentive** | ≥6 present | <6 present | Daydreaming, forgetfulness, difficulty sustaining focus, loses items, appears not to listen, easily distracted, disorganized; **no prominent fidgeting or impulsivity** | | **Predominantly Hyperactive-Impulsive** | <6 present | ≥6 present | Fidgeting, restlessness, difficulty waiting turn, interrupts, talks excessively; **minimal attention problems** | | **Combined Type** | ≥6 present | ≥6 present | Both inattention AND hyperactivity-impulsivity equally prominent | ### Clinical Presentation in This Case **High-Yield:** This child demonstrates: - **Inattention:** Daydreaming, forgetfulness, difficulty concentrating, losing belongings, forgetting instructions, poor sustained attention on independent work - **Hyperactivity-Impulsivity:** **Absent** — no fidgeting, no interrupting, no excessive talking - **Context sensitivity:** Better performance in structured one-on-one settings (suggests attention-dependent rather than impulse-control deficit) - **Neuropsychological profile:** Weakness in working memory and processing speed (consistent with inattentive subtype) **Clinical Pearl:** The Predominantly Inattentive Type is often underdiagnosed in girls because the absence of hyperactivity makes symptoms less conspicuous to teachers and parents. These children are labeled "spacey," "lazy," or "unmotivated" rather than recognized as having ADHD. ### Why Not Combined Type or Hyperactive-Impulsive? - **Combined Type** requires ≥6 symptoms in BOTH inattention AND hyperactivity-impulsivity domains. This child has no hyperactivity or impulsivity. - **Hyperactive-Impulsive Type** requires ≥6 hyperactivity-impulsivity symptoms; this child has none. ### Differential Diagnosis: Learning Disorder vs. ADHD **Warning:** Specific Learning Disorder (SLD) and ADHD are distinct but can co-occur. | Feature | ADHD, Inattentive | Specific Learning Disorder | |---------|-------------------|---------------------------| | **Onset** | Before age 12, across all settings | Often identified when academic demands increase | | **Attention span** | Variable; improves with novelty, one-on-one, or preferred activities | May be normal for non-affected domains | | **Working memory weakness** | Part of executive dysfunction; affects all domains | Domain-specific (e.g., reading, math, writing) | | **Response to structure** | Improves significantly with external structure | May improve but core deficit persists | | **Medication response** | Stimulants improve attention and executive function | No response to ADHD medications | **Key Point:** This child's improvement in one-on-one settings and across-the-board working memory/processing speed weakness favor ADHD over a specific learning disorder. However, formal psychoeducational testing should rule out comorbid SLD. ### Management Implications 1. **Behavioral interventions first:** Parent and teacher training in behavior modification, environmental structure, use of checklists, reminders. 2. **Medication:** If behavioral interventions insufficient, stimulants (methylphenidate, amphetamine) are first-line; atomoxetine is an alternative. 3. **School accommodations:** Extended time, preferential seating, frequent breaks, written instructions. 4. **Neuropsychological follow-up:** To identify and address any comorbid learning disorders. [cite:DSM-5 ADHD Criteria; Sadock's Kaplan & Grebb Psychiatry 11e Ch 38]
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