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Discussion Starter #1 (Edited)
Commonly seen in USMLE is questions that can only be answered when we know the DSM IV specified duration to define a psychiatric illness:

Here's some high-yield examples:

  • Post Traumatic Stress Disorder ---- > More than 1 Month duration But if less than 1 Month then think Acute Stress Disorder (symptoms should present for more than 2 days)
  • Adjustment Disorder -----------> Less than 6 Months duration within the three months of the causative stressful event
  • Somatization Disorder ------> For prolonged periods of time, if shorter then think of conversion disorders. Also there should be more than 8 physical symptoms and onset before age 30
  • Normal Grief ----------> Up to one year, if more then think of major depression
  • Dysthymic and Cyclothymic disorders ------------> More than 2 Years duration
  • Schizophreniform disorder -------------> More than 1 Month and less than 6 Months (just like schizophrenia but shorter duration)
  • Brief psychiatric disorder -------------> 1-30 days only
  • Delusional disorder -------------> at least One Month of non-bizarre delusion
  • Conduct disorder --------> before age 18 Years, if continued it's called Antisocial personality disorder
  • Conduct disorder ------> Duration more than one Year
  • Oppositional Defiant disorder ------> Duration more than 6 Months
  • Major depression ---------- > More than 2 Weeks duration
  • Bipolar disorder ----------- > More than 1 Week duration (One attack is enough to make the diagnosis)
  • Generalized anxiety disorder ----------- > More than 6 Months duration
  • Hypochondriasis ----> More than 6 Months duration
  • Panic Disorder ------------------ > At least three attacks withing 3 weeks and onset to peak of the attack is within 10 minutes
  • Tourette syndrome ------ > More than 1 Year duration and must be diagnosed before age 18 Years.
  • Narcolepsy ----> Duration of daytime sleepiness must be more than 3 Months
  • Mental retardation ----> Onset before age 18
  • ADHD ------> Duration at least 6 Months and Onset before age 7 Years
  • Autism -----> Onset before age 3 Years
  • Monosymptomatic Nocturnal Enuresis ----> Never diagnose before age 5 Years
  • Stranger anxiety ---> 8 Months to 2 Years old
  • Separation anxiety ----> Onset 1 to 3 Years old and may continue into adolescence
 
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