Depression

Differential Diagnosis

General Psychiatric

• Organic causes
  • Delirium
  • Dementia
  • Overdose
• Psychiatric causes
  • Depression
  • Anxiety
  • Conversion disorder
  • Bipolar disorder
  • Acute psychosis
  • Panic attack
  • Schizophrenia

Workup

General ED Psychiatric Workup

• Point-of-care glucose
• CBC
• Chem 7
• LFTs
• ECG (for toxicology evaluation)
• ASA level
• Tylenol level
• Urine toxicology screen/Blood toxicology screen
• EtOH
• Urine pregnancy/beta-hCG (if female of childbearing age)
• Consider:
  • Ammonia (see Hepatic encephalopathy)
  • TSH (hypo or hyperthyroidism may mimic mental illness)
  • CXR (for Tb screen or rule-out delirium in older patient)
  • UA (for rule-out delirium in older patients)
  • Head CT (to rule-out ICH in patients with AMS)
  • Lumbar puncture (to rule-out meningitis or encephalitis)

Disposition

• See Sad person's score