A female patient presents with flashbacks and a history of forgetting about her father's death in a road traffic accident 2 weeks ago. What is the most likely diagnosis?

Explanation

## Correct Answer: D. Acute Stress Disorder (ASD) Acute Stress Disorder (ASD) is the correct diagnosis because the clinical presentation meets the DSM-5 criteria: exposure to a traumatic event (RTA with father's death) occurring 2 weeks ago, combined with dissociative symptoms (flashbacks) and memory impairment (forgetting about the death). The critical temporal discriminator is the **onset within 3 days to 1 month post-trauma**. ASD specifically requires dissociative symptoms (depersonalization, derealization, numbing, reduced awareness, amnesia) as a core feature, which this patient demonstrates through flashbacks and selective amnesia about the traumatic event. The patient's symptom cluster—intrusive memories, dissociative phenomena, and avoidance—occurring in the acute post-trauma window (2 weeks) fits ASD precisely. If symptoms persist beyond 1 month, the diagnosis would shift to PTSD. The dissociative amnesia here is trauma-related and part of the ASD syndrome, not a standalone dissociative disorder. In Indian clinical practice, ASD is often underrecognized in trauma survivors presenting to emergency departments or general hospitals following accidents, yet it predicts higher risk of chronic PTSD if untreated. ## Why the other options are wrong **A. Dissociative Amnesia** — Dissociative Amnesia is a primary dissociative disorder characterized by inability to recall important personal information, typically without flashbacks or intrusive symptoms. While this patient has amnesia (forgetting father's death), the presence of flashbacks—a hallmark of trauma response—excludes isolated dissociative amnesia. Dissociative Amnesia lacks the full trauma symptom cluster (hyperarousal, re-experiencing) seen here. This is an NBE trap: students may fixate on the amnesia component and miss the trauma-specific symptom constellation. **B. Post-Traumatic Stress Disorder (PTSD)** — PTSD requires symptom onset and persistence for **at least 1 month** post-trauma. This patient is only 2 weeks post-event, placing her in the acute phase. While her symptoms (flashbacks, amnesia) overlap with PTSD, the temporal criterion excludes PTSD at this stage. PTSD is the natural progression if ASD symptoms persist beyond 1 month without intervention. Premature PTSD diagnosis ignores the critical time-window distinction that defines ASD's clinical utility in early intervention. **C. Adjustment Disorder** — Adjustment Disorder involves maladaptive emotional or behavioral response to an identifiable stressor, with onset within 3 months and symptom severity not meeting criteria for another mental disorder. Critically, Adjustment Disorder does **not** include flashbacks, intrusive memories, or dissociative phenomena—the hallmark trauma-response symptoms this patient exhibits. Adjustment Disorder is milder and lacks the re-experiencing and dissociative features. This option traps students who conflate any post-stressor reaction with Adjustment Disorder, ignoring the specific trauma-response symptomatology present. ## High-Yield Facts - **ASD onset window: 3 days to 1 month** post-trauma; if symptoms persist beyond 1 month, diagnosis shifts to PTSD. - **Dissociative symptoms are mandatory** in ASD (amnesia, depersonalization, derealization, numbing, reduced awareness); PTSD does not require dissociation. - **Flashbacks + amnesia + trauma exposure within 2 weeks** = ASD until proven otherwise; temporal proximity is the discriminator. - **ASD predicts chronic PTSD risk**; early recognition and intervention (trauma-focused CBT, pharmacotherapy) in Indian trauma centers reduces progression. - **Dissociative Amnesia lacks intrusive re-experiencing**; it is a primary dissociative disorder, not a trauma-response syndrome. ## Mnemonics **ASD vs PTSD: The '1-Month Rule'** **A**cute Stress = **A**cute phase (days to weeks, <1 month); **P**TSD = **P**ersistent (≥1 month). If flashbacks + dissociation occur within 1 month of trauma, think ASD first. **ASD Core Triad: DRE** **D**issociation (amnesia, depersonalization), **R**e-experiencing (flashbacks, intrusive thoughts), **E**xposure (recent trauma). All three present = ASD in acute window. ## NBE Trap NBE pairs dissociative amnesia with trauma to lure students into selecting Dissociative Amnesia as a primary diagnosis. The trap is forgetting that ASD *includes* dissociative amnesia as part of its syndrome, but adds the critical trauma-response features (flashbacks, re-experiencing) and temporal constraint (<1 month) that distinguish it from isolated dissociative disorders. ## Clinical Pearl In Indian trauma centers and emergency departments, ASD is frequently missed because clinicians focus on physical injuries and overlook the dissociative-trauma symptom cluster. Early recognition and referral for trauma-focused cognitive-behavioral therapy within the first month can prevent progression to chronic PTSD, which carries significant morbidity in Indian populations with limited mental health infrastructure. _Reference: DSM-5 Diagnostic Criteria for Acute Stress Disorder (309.81); Harrison's Principles of Internal Medicine Ch. 466 (Psychiatric Disorders); Kaplan & Sadock's Synopsis of Psychiatry (Trauma and Stressor-Related Disorders)_