Correct Answer: B. Acute stress disorder
Acute stress disorder (ASD) is the correct diagnosis because the symptom onset and timeline are the discriminating factors. The patient presents with dissociative symptoms (amnesia for events), re-experiencing phenomena (flashbacks), and avoidance behaviors—all within 2 weeks of a severe psychosocial stressor (father's death in RTA). According to DSM-5 and ICD-10 criteria used in Indian psychiatric practice, ASD is diagnosed when these trauma-related symptoms emerge within 3 days to 1 month following exposure to a traumatic event. The presence of dissociative features (amnesia) is particularly characteristic of ASD and distinguishes it from other conditions. The 2-week duration places this squarely within the ASD window. If symptoms persist beyond 1 month, the diagnosis would shift to PTSD. The key clinical discriminator is the early onset (within 2 weeks) combined with dissociative amnesia, which is the hallmark of ASD in the acute post-trauma phase. In Indian clinical settings, ASD is often underrecognized because clinicians may prematurely label such presentations as depression or dissociative disorders, but the temporal relationship to the stressor and the specific symptom cluster point definitively to ASD.
Why the other options are wrong
A. Major depression — While depressive symptoms may co-occur with trauma, major depression requires a 2-week minimum duration of persistent low mood, anhedonia, and neurovegetative symptoms as the primary presentation. This patient's primary symptoms are dissociative (amnesia) and re-experiencing (flashbacks)—trauma-specific, not mood-specific. Depression would be a secondary diagnosis if it develops later. The acute dissociative response is not explained by major depression alone. C. Dissociative disorder — Dissociative disorders (e.g., dissociative amnesia, depersonalization/derealization disorder) are characterized by persistent dissociative symptoms without a clear temporal link to acute trauma or without the re-experiencing and hyperarousal features. This patient has both dissociation AND flashbacks, which together with the acute 2-week post-trauma timeline define ASD, not a primary dissociative disorder. Dissociative disorders are typically more chronic and less trauma-responsive. D. PTSD — PTSD requires symptom persistence for more than 1 month after trauma exposure. This patient is only 2 weeks post-event, placing her within the ASD diagnostic window. While she will likely meet PTSD criteria if symptoms continue beyond 4 weeks, the current timeline and acute presentation define ASD. Premature PTSD diagnosis ignores the critical temporal boundary that distinguishes the two disorders.
High-Yield Facts
- ASD onset window: 3 days to 1 month post-trauma; PTSD requires symptoms >1 month—this is the key temporal discriminator.
- Dissociative amnesia for the traumatic event is a hallmark feature of ASD and often the presenting complaint in Indian trauma survivors.
- Re-experiencing (flashbacks, intrusive memories) + dissociation + avoidance within 2 weeks = ASD until proven otherwise.
- ASD prevalence in Indian RTA survivors is underestimated; many are misdiagnosed as depression or adjustment disorders in primary care.
- Dissociative symptoms in ASD (depersonalization, derealization, amnesia) are more prominent in the acute phase than in PTSD.
Mnemonics
ASD vs PTSD: The '1-Month Rule' Acute Stress = Acute (within 1 month); PTSD = Persistent (beyond 1 month). If <4 weeks post-trauma with dissociation + flashbacks → ASD. If >4 weeks → PTSD. ASD Triad: DRE Dissociation (amnesia, depersonalization), Re-experiencing (flashbacks), Exposure (acute stressor). All three within 2 weeks = ASD.
NBE Trap
NBE often pairs "dissociative symptoms" with "dissociative disorder" to trap students who confuse symptom overlap with diagnosis. The key trap here is ignoring the acute timeline and trauma-specific re-experiencing—dissociation alone does not equal dissociative disorder; in the acute post-trauma context with flashbacks, it defines ASD.
Clinical Pearl
In Indian emergency departments and trauma centers, young women presenting with amnesia and flashbacks after RTA-related bereavement are frequently misdiagnosed as depressed or "hysterical." Recognizing the 2-week post-trauma window with dissociative amnesia as ASD allows early psychological intervention (debriefing, supportive counseling) to prevent progression to chronic PTSD—critical in resource-limited Indian settings where long-term psychiatric follow-up is inconsistent.
_Reference: DSM-5 (Diagnostic and Statistical Manual of Mental Disorders, 5th Edition), Trauma and Stressor-Related Disorders section; ICD-10 Clinical Descriptions and Diagnostic Guidelines, F43.0 (Acute Stress Reaction); Kaplan & Sadock's Synopsis of Psychiatry (relevant for Indian medical curricula)_