FRCEM SBA practice questions is a core part of UK Emergency Medicine practice. Stress disorders sit at an uncomfortable intersection for emergency clinicians: they are common, clinically significant, frequently co-exist with physical injury, and carry genuine mortality risk through suicide, yet they remain systematically under-recognised and underprepared for by candidates sitting the FRCEM SBA exam. Acute Stress Reaction (ASR), Acute Stress Disorder (ASD) and Post-Traumatic Stress Disorder (PTSD) each appear in the Royal College of Emergency Medicine curriculum as mandatory knowledge domains, and the SBA format increasingly tests nuanced diagnostic distinctions, appropriate referral pathways and evidence-based pharmacological decision-making. This article provides the academic depth you need to approach these topics confidently in the exam and to manage patients safely in practice.
FRCEM SBA practice questions: Key Points: Stress Disorders in the ED
- ASR, ASD and PTSD are differentiated primarily by symptom duration and timing relative to the index trauma, not by symptom character alone.
- Dissociative symptoms at the time of or immediately after trauma are a major independent risk factor for progression to PTSD and require explicit documentation.
- ICD-11 and DSM-5 use slightly different diagnostic frameworks; FRCEM SBA practice questions may test either, but ICD-11 is the UK clinical standard.
- Immediate ED management centres on psychological first aid, safety assessment including active suicidality, and appropriate onward referral rather than pharmacological intervention alone.
- Benzodiazepines are not first-line and may worsen long-term outcomes in ASD; this is a classic exam pitfall.
- Disposition decisions must integrate safeguarding considerations, particularly following assault, sexual violence or domestic abuse.
Definitions, Epidemiology and Why This Matters in the ED
Population data consistently demonstrate that traumatic events are not rare: conservative estimates suggest up to 70% of adults will experience at least one potentially traumatic event during their lifetime. Of those exposed, approximately 20 to 25% develop ASD in the immediate aftermath, and around half of those with ASD subsequently meet criteria for PTSD. UK lifetime PTSD prevalence sits at approximately 3 to 4% in the general population, with substantially higher rates among emergency service workers, military veterans, survivors of sexual violence and refugee populations. The ED is frequently the first clinical point of contact following a traumatic event, which means emergency physicians carry a specific responsibility to identify at-risk individuals early.
The three conditions exist on a temporal continuum. ASR is an immediate, transient psychological response to overwhelming stress, typically resolving within hours to a few days. ASD shares many of the same symptom clusters but persists beyond three days and up to one month after trauma exposure. PTSD, by definition under both ICD-11 and DSM-5 frameworks, is diagnosed when symptoms persist beyond one month. The clinical distinction matters in the exam because question stems frequently specify a time point, and choosing the correct diagnosis depends on correctly interpreting that temporal clue.
Common precipitating events encountered in UK emergency departments include road traffic collisions (including bystanders and first responders), physical assault and domestic violence, sexual assault and rape, traumatic bereavement or witnessing death, life-threatening medical events such as cardiac arrest or anaphylaxis, industrial accidents and, in delayed presentations, childhood trauma. NICE guidance on PTSD (NG116) explicitly identifies these high-risk groups and informs the triage and referral decisions that ED clinicians must make.
Pathophysiology: The Neurobiology of Acute Stress
A registrar-level understanding of the underlying mechanisms not only supports clinical reasoning but is directly tested in the mechanistic question styles found in FRCEM SBA exam questions. Acute stress activates two parallel systems: the hypothalamic-pituitary-adrenal (HPA) axis and the sympathoadrenal system. The immediate catecholamine surge via the adrenal medulla mediates the classic fight-or-flight response, producing tachycardia, hypertension, hyperventilation, peripheral vasoconstriction and heightened sensory alertness. Cortisol release via the HPA axis follows, consolidating the physiological response and modulating immune function.
In individuals who go on to develop ASD and PTSD, this response is dysregulated in characteristic ways. Amygdala hyperreactivity produces heightened threat detection and fear conditioning. Prefrontal cortical inhibition of the amygdala is impaired, reducing top-down emotional regulation. Hippocampal volume, which is critical for contextualising threat and integrating episodic memory, is reduced in PTSD, contributing to fragmented, intrusive and context-stripped traumatic memories. Paradoxically, cortisol levels may be low rather than high in established PTSD, reflecting HPA axis dysregulation rather than ongoing activation. This is a counterintuitive fact that occasionally appears in MRCEM SBA exam questions on the neurobiological basis of PTSD.
Peritraumatic dissociation, a depersonalisation or derealisation response occurring at or immediately after the traumatic event, is now recognised as one of the strongest predictors of subsequent PTSD. The mechanism is thought to involve acute suppression of hippocampal memory encoding, producing the fragmented, non-integrated traumatic memory trace that underpins intrusive re-experiencing symptoms. Identifying dissociation in the ED therefore carries real prognostic weight and should inform referral urgency.
ED Assessment and Management
History and Clinical Assessment
The clinical assessment begins with a structured trauma-informed history. Establish the nature and timing of the index event, symptom onset and trajectory, and the presence of core symptom clusters: re-experiencing (intrusive memories, nightmares, flashbacks), avoidance (of trauma-related stimuli), negative cognitions and mood (guilt, shame, emotional numbing), and hyperarousal (insomnia, irritability, hypervigilance, exaggerated startle). Explicitly enquire about dissociative symptoms, as patients rarely volunteer these. Document peritraumatic panic, sense of horror, and perceived life threat, all of which inform risk stratification.
A critical component of ED assessment is active suicide risk evaluation. PTSD carries a substantially elevated suicide risk; the presence of command hallucinations, active suicidal ideation with intent or plan, or significant self-neglect mandates urgent liaison psychiatry referral. The NICE self-harm guidelines (NG225) provide the framework for structured risk assessment in this context. Document your risk assessment explicitly: vague notes about mood that omit suicidality assessment are both clinically and medicolegally inadequate.
Physical examination must not be omitted. Head injury, intoxication, hypoglycaemia, hypoxia and sepsis can each produce acute behavioural disturbance and altered cognition that mimics or co-exists with ASR. Perform targeted investigations based on clinical context: blood glucose, oxygen saturation, ECG in the context of significant physiological stress, and urine toxicology where relevant. In assault and sexual assault cases, forensic examination pathways and safeguarding referrals must be initiated promptly and in accordance with local protocol.
Immediate Management: Psychological First Aid
The evidence base supports psychological first aid (PFA) as the appropriate immediate intervention in the ED, not formal psychological debriefing. Critical incident stress debriefing, once widely used, is now contraindicated by evidence showing it may worsen outcomes by forcing premature processing of traumatic material. PFA instead provides a structured, non-intrusive approach centred on safety and comfort, addressing practical needs, facilitating social support and providing information without demanding disclosure. This approach aligns with both NICE NG116 and WHO guidance.
Pharmacological management in the acute phase is limited and must be used judiciously. Benzodiazepines are explicitly not recommended for routine use in ASR or ASD: beyond their well-known risks of dependence and cognitive impairment, there is evidence they may impair the fear extinction processes necessary for natural recovery, thereby increasing PTSD risk. Short-term hypnotics may be considered for severe insomnia causing functional impairment, but only with explicit time-limiting and safety-netting. Propranolol, once postulated to reduce PTSD incidence by blunting noradrenergic consolidation of traumatic memory, has not demonstrated clinical efficacy in randomised trials and should not be prescribed outside a research context. If pharmacological treatment for established PTSD is indicated, the NICE PTSD guideline (NG116) recommends trauma-focused cognitive behavioural therapy (TF-CBT) or EMDR as first-line treatments, with SSRIs (sertraline or paroxetine) reserved for those who decline or cannot access psychological therapy.
Disposition and Referral
Most patients with ASR can be safely discharged with written safety-netting information, a clear follow-up plan via their GP, and signposting to NHS Talking Therapies (formerly IAPT) services. Where ASD is suspected, a referral to a specialist trauma service or liaison psychiatry outpatient clinic is appropriate. Active suicidality, severe dissociation, inability to maintain safety, or significant safeguarding concerns (including domestic or sexual violence) require urgent liaison psychiatry review, potential admission, and activation of safeguarding protocols in accordance with local and national frameworks. The treating clinician must communicate clearly with the receiving team and document the risk assessment, management plan and rationale in full.
How the FRCEM SBA Exam Tests Stress Disorders
The FRCEM SBA exam consistently tests this topic in several predictable patterns that are worth mapping explicitly during your FRCEM SBA revision. First, expect temporal diagnosis questions: a vignette describes a patient with specific symptoms at a defined time point after trauma, and you must select the correct diagnosis from ASR, ASD and PTSD based on duration criteria. Second, management decision questions test whether you can correctly rank interventions, for example placing PFA above benzodiazepines, or TF-CBT above SSRIs for established PTSD. Third, risk stratification questions present clinical scenarios with a specific red flag (dissociation, suicidal ideation, domestic violence) and test whether you select the appropriately escalated management pathway rather than a standard discharge.
The RCEM curriculum maps this topic under the domains of mental health, safeguarding and major trauma. Candidates who approach FRCEM SBA practice questions on this topic without understanding the ICD-11 diagnostic criteria, the evidence base against benzodiazepines, and the structure of safe referral pathways consistently lose marks. The distinction between ASR (hours to days, ICD-11 category QE84) and ASD (three days to one month) is a frequent source of error. Similarly, confusing the indications for liaison psychiatry referral versus GP follow-up is a reliable mark differentiator.
Revision Pearls: High-Yield Facts for the FRCEM SBA
- ASR resolves within days by definition; symptoms persisting beyond three days meeting PTSD symptom clusters constitute ASD under ICD-11.
- PTSD requires symptom duration of more than one month under both ICD-11 and DSM-5; the one-month threshold is the single most frequently tested diagnostic criterion.
- Peritraumatic dissociation is the strongest acute predictor of PTSD development and must be explicitly documented in the ED.
- Benzodiazepines are contraindicated in the routine management of ASR and ASD and may increase PTSD risk by impairing fear extinction.
- TF-CBT and EMDR are first-line treatments for PTSD; SSRIs are second-line for those unable to access psychological therapy, per NICE NG116.
- Cortisol levels in established PTSD are often low, not high, reflecting HPA axis dysregulation. This counterintuitive fact is tested in mechanistic question formats.
- Female sex approximately doubles the risk of PTSD following equivalent trauma exposure; this influences risk stratification in clinical vignettes.
- Critical incident stress debriefing is contraindicated; psychological first aid is the evidence-based immediate intervention.
Common Pitfalls: Where Candidates Lose Marks
- Selecting benzodiazepines as the pharmacological intervention of choice for acute stress states, a classic and heavily penalised error.
- Failing to apply the one-month duration threshold correctly, confusing ASD with PTSD or misclassifying ASR.
- Overlooking the need for organic exclusion (hypoglycaemia, head injury, intoxication) before attributing behavioural change to a stress disorder.
- Neglecting active suicide risk assessment in the clinical vignette management options, resulting in selection of an inappropriately low-acuity disposition.
- Confusing ICD-11 and DSM-5 criteria when the question specifies the diagnostic framework; read the stem carefully.
- Omitting safeguarding referral in vignettes involving assault or domestic violence, where this is a mandatory parallel action regardless of mental health disposition.
- Recommending critical incident debriefing, which is now contraindicated by evidence and would represent a patient safety error in practice.
How EM Learning Centre Supports Your MRCEM Single Best Answer Revision
Stress disorders represent exactly the kind of cross-disciplinary, nuanced topic that rewards systematic, structured revision over last-minute cramming. The MRCEM Single Best Answer revision course at EM Learning Centre covers the full breadth of the RCEM curriculum, including mental health presentations, psychiatric emergencies, safeguarding and the diagnostic frameworks examined in the FRCEM SBA. Our question bank includes detailed worked explanations for every answer option, not merely the correct one, so you understand precisely why distractors are wrong and can apply that reasoning under exam conditions.
Whether you are building foundational knowledge or refining your approach to high-stakes FRCEM SBA practice questions in the final weeks before your sitting, the EM Learning Centre platform is designed to meet you at your current level and systematically close the gaps that cost candidates marks. Our content is written and reviewed by practising UK emergency medicine consultants, ensuring clinical accuracy and direct curriculum relevance throughout.
References
- National Institute for Health and Care Excellence. Post-traumatic stress disorder (NG116). 2018. NICE (nice.org.uk)
- National Institute for Health and Care Excellence. Self-harm: assessment, management and preventing recurrence (NG225). 2022. NICE (nice.org.uk)
- Royal College of Emergency Medicine. RCEM Curriculum and Credentialing Framework. Royal College of Emergency Medicine (rcem.ac.uk)
- NICE Clinical Knowledge Summaries. PTSD. NICE Clinical Knowledge Summaries (cks.nice.org.uk)
- NHS. Overview: Post-traumatic stress disorder. NHS (nhs.uk)
- The BMJ. Psychological debriefing for preventing post traumatic stress disorder. The BMJ (bmj.com)
