Question 1

What is the difference between PTSD and acute stress disorder?

Accepted Answer

The primary difference is timeline. Acute stress disorder is diagnosed when post-traumatic symptoms are present from 3 days to 1 month after a traumatic event. PTSD is diagnosed when symptoms persist beyond 1 month. The symptom content is largely the same.

Question 2

Does acute stress disorder always turn into PTSD?

Accepted Answer

No. Research suggests that roughly half of individuals diagnosed with ASD go on to develop PTSD, though estimates vary by study and population. PTSD can also develop in individuals who did not meet ASD criteria in the first month.

Question 3

Can you have PTSD and acute stress disorder at the same time?

Accepted Answer

No. They are sequential diagnoses, not co-occurring. ASD applies from 3 days to 1 month post-trauma. If symptoms persist beyond 1 month and meet PTSD criteria, the diagnosis converts from ASD to PTSD.

Question 4

A 30-year-old man is brought to the psychiatric clinic by his wife. Three weeks ago, he was involved in a serious motor vehicle accident in which his passenger was killed. Since the accident, he has had recurrent intrusive memories of the crash, nightmares about the event, hypervigilance while driving, emotional numbness, and avoidance of the highway where the accident occurred. He also describes episodes of feeling as though he is detached from his body and that the world around him is unreal. He has been unable to return to work. Which of the following is the most likely diagnosis?

Accepted Answer

The timeline is the key. Symptoms have been present for 3 weeks, which falls within the 3-day to 1-month window for acute stress disorder, following a qualifying traumatic event (motor vehicle accident in which his passenger was killed). The patient has symptoms spanning multiple categories — intrusion (intrusive memories, nightmares), avoidance (avoiding the highway), negative mood (emotional numbness), arousal (hypervigilance), and dissociation (depersonalization, derealization) — consistent with ASD. PTSD (A) cannot be diagnosed until symptoms have persisted beyond 1 month. Adjustment disorder (C) would be considered if the stressor did not meet Criterion A for a traumatic event or if the symptom profile did not meet ASD or PTSD criteria. A normal grief reaction (D) does not account for the full post-traumatic symptom constellation including dissociation and intrusive re-experiencing.

Question 5

A 25-year-old female combat veteran presents 4 months after returning from deployment. She reports persistent flashbacks of an IED explosion that killed two members of her unit, recurrent nightmares, avoidance of loud noises and crowded places, persistent negative beliefs about herself ("It was my fault"), emotional detachment from her family, irritability, hypervigilance, and difficulty sleeping. She was evaluated 2 weeks after the event and diagnosed with acute stress disorder at that time. What is the most appropriate current diagnosis?

Accepted Answer

The patient's symptoms have persisted for 4 months post-trauma, well beyond the 1-month maximum for acute stress disorder. She has symptoms consistent with all four PTSD clusters: intrusion (flashbacks, nightmares), avoidance (loud noises, crowded places), negative alterations in cognition and mood (distorted self-blame, emotional detachment, negative beliefs), and arousal/reactivity (irritability, hypervigilance, sleep disturbance). The ASD diagnosis converts to PTSD once symptoms persist beyond 1 month — ASD does not persist past that window. If criteria are met beyond 1 month, the diagnosis is PTSD. There is no delayed expression specifier for ASD (that is a PTSD specifier only). Adjustment disorder (D) would not be appropriate when full PTSD criteria are met following a Criterion A traumatic event.

Question 6

A 40-year-old woman survived a building collapse 10 days ago. She presents with intrusive images of the event, nightmares, avoidance of the building site, difficulty experiencing positive emotions, depersonalization, exaggerated startle response, and insomnia. Her psychiatrist is considering trauma-focused cognitive-behavioral therapy. Which of the following statements about early intervention is most accurate?

Accepted Answer

Brief trauma-focused CBT delivered during the ASD period has evidence from multiple randomized controlled trials for reducing the progression from ASD to PTSD. Critical Incident Stress Debriefing (A) has not been shown to prevent PTSD in systematic reviews, and some evidence suggests it may be associated with worse outcomes in certain populations — this is a commonly tested board fact. Benzodiazepines (C) are not recommended for PTSD prevention and may interfere with fear extinction processes that are important for natural recovery and therapeutic exposure. Deferring treatment (D) is not supported by the evidence — early intervention during the ASD window is a genuine secondary prevention opportunity.

PTSD vs Acute Stress Disorder

Frequently Asked Questions

What is the difference between PTSD and acute stress disorder?

Does acute stress disorder always turn into PTSD?

Can you have PTSD and acute stress disorder at the same time?

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