## Clinical Vignette Analysis: Inattentive ADHD ### Presentation Summary The child exhibits classic inattention symptoms: - Organization difficulties - Forgetfulness - Losing belongings - BUT: No reported hyperactivity or impulsivity (sits quietly, does not interrupt) ### Diagnostic Distinction **Key Point:** This child meets criteria for ADHD Predominantly Inattentive Type because he has ≥6 inattention symptoms but does NOT have ≥6 hyperactivity-impulsivity symptoms. The absence of hyperactivity-impulsivity is the defining feature that excludes Combined Type. ### Why Inattentive Type Is Often Missed **Clinical Pearl:** Inattentive ADHD is frequently underdiagnosed in early childhood because these children are not disruptive in the classroom. They are often described as "spacey," "forgetful," or "lazy" rather than referred for psychiatric evaluation. Teachers may not report concerns because the child is compliant and quiet. **High-Yield:** The quiet, organized-looking child who loses things and forgets instructions is a classic Inattentive Type presentation—do NOT assume ADHD requires hyperactivity. ### Diagnostic Criteria Met | Criterion | Status | Evidence | | --- | --- | --- | | **Inattention symptoms ≥6** | ✓ Met | Organization, forgetfulness, losing items | | **Hyperactivity-Impulsivity ≥6** | ✗ Not met | Sits quietly, does not interrupt | | **Onset before age 12** | ✓ Met | Age 6 | | **Functional impairment ≥2 settings** | ✓ Likely | School and home reported | | **Not better explained by other disorder** | ✓ Assumed | No mention of alternative etiology | ### Mnemonic: ADHD Subtypes **"I-HI-C"** = **Inattentive** (I only), **Hyperactive-Impulsive** (HI only), **Combined** (both I and HI) - **Inattentive:** Daydreamy, forgetful, disorganized → quiet in class - **Hyperactive-Impulsive:** Fidgety, interrupts, restless → disruptive in class - **Combined:** Both profiles → most common (~70%)
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