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A 28-year-old male presents for psychiatric evaluation reporting difficulty concentrating, impulsive spending, racing thoughts, irritability, and decreased need for sleep. He was diagnosed with ADHD at age 8 and took methylphenidate through high school. His current symptoms have worsened markedly over the past 3 months. He describes this period as distinctly different from his baseline, noting he usually sleeps 8 hours but now feels fully rested on 3-4 hours. His speech is pressured, he has started four new business ventures in the past month, and his wife reports his behavior is 'completely different from his normal self.' The most likely current diagnosis is:
Explanation
The ADHD-vs-bipolar question hinges on one concept: episodicity. ADHD is a chronic, trait-like pattern present since childhood. Mania is an episodic departure from baseline. When someone with known ADHD develops a discrete episode of escalating symptoms that their partner describes as completely out of character, think bipolar superimposed on ADHD. The decreased need for sleep (feeling rested, not insomnia) is a particularly strong mania indicator.
Key Takeaway
ADHD is chronic and trait-like while mania is episodic; a discrete change from baseline functioning, especially decreased need for sleep. In a patient with ADHD history should raise concern for comorbid bipolar disorder.