Learning Objectives
Master the clinical diagnosis of a Manic Episode. Understand the duration requirements, the necessity of functional impairment, and the high-yield DIG FAST mnemonic used for the USMLE Step 1.
1. Clinical Definition and Requirements
A manic episode is a distinct period of abnormally and persistently elevated, expansive, or irritable mood with increased activity or energy.
| Criteria | Threshold for Diagnosis |
|---|---|
| Duration | Symptoms must last >= 1 week, or any duration if hospitalization is required. |
| Severity | Must cause marked functional impairment (social, occupational, or legal). |
| Symptom Count | Requires >= 3 of the characteristic symptoms (4 if the mood is only irritable). |
2. The DIG FAST Mnemonic
Use this mnemonic to identify the active symptoms during a manic episode.
| Letter | Symptom | Clinical Presentation |
|---|---|---|
| D | Distractibility | Difficulty focusing; easily pulled away by irrelevant stimuli. |
| I | Impulsivity | Hedonistic behavior (spending sprees, sexual indiscretion). |
| G | Grandiosity | Inflated self-esteem or belief in “special powers.” |
| F | Flight of Ideas | Subjective sense of racing thoughts. |
| A | Activity | Increased Goal-directed activity or psychomotor agitation. |
| S | Sleep | Decreased need for sleep (feels rested after only 2–3 hours). |
| T | Talkativeness | Pressured speech; difficult to interrupt. |
Activity:
Activity
High-Yield Clinical Pearls:
- The Hospital Rule: If the board question says the patient was hospitalized or has psychotic features, the answer is always Mania/Bipolar I, regardless of the 1-week duration.
- Sleep vs. Insomnia: In mania, there is a decreased NEED for sleep (they don’t feel tired). In insomnia, they want to sleep but cannot.
- Antidepressant Danger: Starting an SSRI/antidepressant in a patient with undiagnosed Bipolar Disorder can trigger a manic episode.