PTSD vs Acute stress disorder
How to tell PTSD and Acute stress disorder apart when a board question makes them look alike.
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Symptom duration beyond 1 month is the key discriminator for PTSD versus acute stress disorder.
Side by side
Trauma-related intrusive memories, avoidance, negative mood-cognition changes, and hyperarousal lasting more than 1 month indicate PTSD.
The same trauma-related symptom clusters occurring from day 3 through day 30 after trauma indicate acute stress disorder.
Persistent maladaptive fear-memory consolidation and hyperadrenergic reactivity sustain long-term post-trauma symptoms.
Early post-traumatic stress response causes short-duration dysregulation before chronic consolidation occurs.
Diagnosis is clinical; PTSD requires symptom duration above 1 month with impairment and may co-occur with sleep disturbance, irritability, and exaggerated startle response.
Acute stress disorder requires trauma-linked symptoms lasting at least 3 days but less than 1 month; persistent symptoms beyond 1 month reclassify to PTSD.
The trap
Clinicians may diagnose PTSD too early in week 1 after trauma. The timing window matters because early cases are acute stress disorder and management emphasizes early psychotherapy and monitoring progression.
The repair move
Next best step: diagnose acute stress disorder when symptoms are within 3 to 30 days and start trauma-focused psychotherapy promptly. If symptoms persist beyond 1 month, reclassify as PTSD and continue trauma-focused therapy, adding an SSRI such as sertraline when functional impairment remains significant.
Try a free question
CoreA 31-year-old woman develops nightmares, intrusive recollections, and avoidance 12 days after an armed robbery. She remains hypervigilant but has no prior psychiatric history. What is the most likely diagnosis?
Show answer and explanation
Answer: A. Acute stress disorder. Trauma-related symptoms within the first month meet criteria for acute stress disorder rather than PTSD.
Why the other choices are tempting
- B. PTSD requires persistence longer than one month.
- C. Generalized anxiety disorder is not trauma-anchored and requires broader chronic worry criteria.
- D. Panic disorder centers on recurrent unexpected panic attacks rather than trauma-linked intrusion and avoidance.
- E. OCD requires obsessions and compulsions not described here.
Flashcards
Tap a card to flip it.
What time threshold separates PTSD from acute stress disorder after trauma exposure?
PTSD requires symptom persistence beyond 1 month, whereas acute stress disorder lasts from day 3 to day 30.
Which symptom clusters overlap between acute stress disorder and PTSD?
Intrusion, avoidance, negative mood-cognition changes, and arousal symptoms can occur in both.
Quick answers
What is the fastest way to tell PTSD from Acute stress disorder?
Symptom duration beyond 1 month is the key discriminator for PTSD versus acute stress disorder.
What is the key clue for PTSD?
Trauma-related intrusive memories, avoidance, negative mood-cognition changes, and hyperarousal lasting more than 1 month indicate PTSD.
What is the key clue for Acute stress disorder?
The same trauma-related symptom clusters occurring from day 3 through day 30 after trauma indicate acute stress disorder.
What is the common trap with PTSD vs Acute stress disorder?
Clinicians may diagnose PTSD too early in week 1 after trauma. The timing window matters because early cases are acute stress disorder and management emphasizes early psychotherapy and monitoring progression.