Attention-Deficit/Hyperactivity Disorder vs Bipolar II Disorder and Cyclothymic Disorder
Attention-Deficit/Hyperactivity Disorder and Bipolar II Disorder and Cyclothymic Disorder are easy to mix up on the boards. Here's a side-by-side comparison — presentation, workup, imaging, and first-line treatment — drawn from our full outlines.
Attention-Deficit/Hyperactivity Disorder vs Bipolar II Disorder and Cyclothymic Disorder at a glance
- Attention-Deficit/Hyperactivity Disorder: Persistent inattention and/or hyperactivity-impulsivity present before age 12 with cross-setting impairment.
- Bipolar II Disorder and Cyclothymic Disorder: Mood disorders with hypomanic (not manic) episodes; bipolar II has full depressive episodes, cyclothymia has chronic subthreshold oscillation.
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Side-by-side comparison
| Feature | Attention-Deficit/Hyperactivity Disorder | Bipolar II Disorder and Cyclothymic Disorder |
|---|---|---|
| At a glance | Persistent inattention and/or hyperactivity-impulsivity present before age 12 with cross-setting impairment. | Mood disorders with hypomanic (not manic) episodes; bipolar II has full depressive episodes, cyclothymia has chronic subthreshold oscillation. |
| Classic presentation | Inattention: careless mistakes, difficulty sustaining attention, doesn't listen, fails to follow through, organization difficulties, avoids sustained mental effort, loses things, easily distracted, forgetful; Hyperactivity-impulsivity: fidgets, leaves seat, runs/climbs inappropriately, can't engage quietly, 'on the go', talks… | Patient presents with depression and reports past 'best week of my life' periods of needing only 3 hours of sleep, completing massive projects, and spending impulsively — without ever being hospitalized or psychotic.; Hypomania: elevated/expansive or irritable mood, decreased need for sleep, increased energy and goal-directed activity,… |
| Workup / key labs | DSM-5-TR: (A) >=6 inattention and/or >=6 hyperactivity-impulsivity symptoms for >=6 months in children, or >=5 for individuals age 17 and older; (B) Several symptoms present before age 12; (C) Present in >=2 settings; (D) Clear interference with functioning; (E) Not better explained by another disorder. Specify combined, predominantly… | Bipolar II: ≥1 hypomanic episode (≥4 days, ≥3 of 7 symptoms, observable change, no marked impairment/psychosis/hospitalization) + ≥1 MDE; never met manic criteria. Cyclothymia: ≥2 yr (≥1 yr youth) of subthreshold hypomanic AND depressive symptoms, ≥half the time, no symptom-free interval >2 mo, no MDE/manic/hypomanic episode in first 2… |
| Imaging | Not routinely indicated | Not routinely indicated; Neuroimaging if first episode late-life or focal neurologic findings |
| First-line treatment | Behavioral parent training and classroom interventions — first-line in preschool age (4-5 years) and adjunct at all ages; Stimulant — methylphenidate, lisdexamfetamine, mixed amphetamine salts (first-line pharmacotherapy school-age and older); titrate to effect over weeks; School accommodations (IEP/504); psychoeducation; sleep… | Bipolar II acute depression: quetiapine (best evidence), lurasidone, cariprazine, or lumateperone; Bipolar II maintenance: lithium (anti-suicide benefit), lamotrigine (especially if depression-predominant), or quetiapine; Cyclothymia: mood stabilizer (lithium, valproate, lamotrigine) ± psychotherapy; Psychotherapy: CBT, family-focused… |
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