A recent Emergency Medicine digest,
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Study Type: Randomized controlled trial

Key Question: Does point-of-care ultrasound (POCUS) improve patient-family experience, stress, and anxiety in pediatric emergency department care?

Key Findings:

• Both POCUS and non-POCUS groups showed significant reductions in stress and anxiety from arrival to discharge (p < 0.0001 for stress in both groups; p < 0.0001 and p = 0.0003 for anxiety respectively)
• No significant differences between groups in patient experience scores or ED length of stay
• POCUS families reported significantly greater perceived importance of imaging and stated POCUS directly alleviated their stress and anxiety

Clinical Relevance: While POCUS doesn't demonstrate superior anxiety reduction compared to standard care, families value the intervention and perceive it as beneficial, supporting its use as part of patient-centred care in UK paediatric emergency departments.

Limitations: Study population was predominantly English-speaking, non-Hispanic White patients, limiting generalisability to diverse UK populations.

Study Type: Systematic review

Key Question: Is ultrasound superior to plain radiography for detecting radiolucent soft tissue foreign bodies in the extremities?

Key Findings:

• Ultrasound demonstrated high sensitivity (90-99%) for detecting radiolucent foreign bodies across six included studies
• Plain radiography detected no radiolucent foreign bodies in the comparative studies
• Most studies were small, single-centre investigations with experienced ultrasound operators

Clinical Relevance: This supports ultrasound as the imaging modality of choice for suspected radiolucent foreign bodies in UK emergency departments, potentially reducing missed diagnoses and unnecessary procedures.

Limitations: Limited generalisability due to small study sizes, single-centre designs, and reliance on experienced operators rather than typical emergency department skill levels.

Study Type: Prospective multicentre cohort study

Key Question: Does the MATTS triage tool accurately identify major trauma patients requiring specialist major trauma centre care in the prehospital setting?

Key Findings:

• MATTS demonstrated 55.3% sensitivity (95% CI 51.8-58.7%) and 94.3% specificity (95% CI 94.1-94.6%) for identifying major trauma among 38,010 injured patients
• Only 6.3% of cases showed evidence of actual MATTS tool use, despite good theoretical performance when applied retrospectively
• The undertriage/overtriage trade-off met previously established economic targets for major trauma triage

Clinical Relevance: This validates MATTS as meeting accuracy targets for major trauma triage decisions, but highlights implementation challenges that UK ambulance services must address before wider NHS adoption.

Limitations: Low documented adherence to the tool (6.3%) suggests results may not reflect real-world performance and raises questions about implementation fidelity.

Study Type: Observational cohort substudy

Key Question: How do anxiety and depression symptoms compare between out-of-hospital cardiac arrest survivors and their partners at 3 months post-arrest?

Key Findings:

• No significant difference in anxiety (median HADS-A: survivors 4 vs partners 5, p=0.107) or depression scores (median HADS-D: both groups 1, p=0.290) between survivor-partner dyads
• Older survivors had lower anxiety (β -0.065, 95% CI -0.125 to -0.025) and depression scores (β -0.040, 95% CI -0.090 to 0.00)
• Poor self-rated health was associated with higher anxiety and depression scores in both survivors and partners

Clinical Relevance: Emergency clinicians should consider that partners of cardiac arrest survivors experience similar psychological burden to survivors themselves, warranting inclusion in post-discharge support and follow-up planning.

Limitations: Single time-point assessment at 3 months limits understanding of symptom trajectory over time.

Study Type: Retrospective cohort study

Key Question: How does preceding out-of-hospital cardiac arrest affect patient characteristics, clinical course, and mortality outcomes in patients receiving mechanical circulatory support for acute MI cardiogenic shock?

Key Findings:

• Among 241 patients with cardiogenic shock requiring MCS, 49.4% had preceding OHCA with similar 30-day mortality rates (63.0% vs 61.2%, p=0.869)
• Mortality predictors differed by group: OHCA patients - resuscitation >30 minutes, non-shockable rhythm, multivessel disease; non-OHCA patients - age, lactate, in-hospital arrest
• OHCA patients paradoxically had fewer comorbidities and less multivessel disease despite more acute presentation

Clinical Relevance: This challenges assumptions about futility in post-arrest cardiogenic shock patients, suggesting OHCA history alone should not preclude consideration for advanced mechanical support in UK emergency departments.

Limitations: Single-country registry data may limit generalisability to UK healthcare systems and patient populations.

Study Type: Retrospective observational cohort study

Key Question: Does transthoracic impedance affect the success of defibrillation and VF/pVT recurrence in out-of-hospital cardiac arrest patients receiving impedance-compensated shocks?

Key Findings:

• Analysis of 8,333 shocks in 1,880 OHCA patients showed impedance ≥100Ω significantly reduced defibrillation success (adjusted OR 0.994 per 1-Ω increase, 95% CI 0.988-0.999)
• Impedance <100Ω had no significant effect on VF/pVT termination (adjusted OR 0.999, 95% CI 0.993-1.006)
• Transthoracic impedance did not influence VF/pVT recurrence after successful termination

Clinical Relevance: High impedance (≥100Ω) reduces defibrillation effectiveness even with modern impedance-compensated defibrillators, suggesting UK emergency services should prioritise optimal pad placement and contact to minimise impedance.

Limitations: Retrospective design cannot establish causation and may be subject to unmeasured confounding factors affecting defibrillation success.

Study Type: Counterfactual simulation study

Key Question: Could wearable devices with pulselessness detection technology improve survival in unwitnessed out-of-hospital cardiac arrests by enabling earlier EMS notification?

Key Findings:

• Complete adoption (100% cases, 100% sensor sensitivity) could increase survival from 0.5% to 8.3% in unwitnessed arrests, yielding 693 additional survivors over 5 years in Western Australia
• Modest adoption (10% cases, 80% sensor sensitivity) could still double survival from 0.5% to 1.1%, adding 52 survivors over 5 years
• Two-thirds of EMS-attended arrests are unwitnessed with current survival <5%

Clinical Relevance: This technology could significantly impact UK emergency medicine practice, where unwitnessed arrests similarly have poor outcomes, by potentially converting these cases into witnessed arrests with earlier intervention.

Limitations: Simulation modelling relies on assumptions about device performance and uptake rates that may not reflect real-world implementation challenges.

Study Type: Retrospective analysis

Key Question: What is the involvement and psychological impact of community first responders (CFRs) activated to pediatric out-of-hospital cardiac arrests in Denmark?

Key Findings:

• Of 157 CFRs who arrived at 55 pediatric cardiac arrests, 54% arrived before EMS and 30% performed CPR
• One-third (34%) reported moderate-to-severe immediate distress, rising to 52% among those arriving before EMS and 64% among those performing CPR
• Despite distress, 99% remained willing to continue volunteering as CFRs

Clinical Relevance: This informs UK emergency services considering CFR activation for pediatric arrests, highlighting both potential early intervention benefits and the need for psychological support systems for volunteers.

Limitations: Study reflects only immediate psychological responses without long-term follow-up data on CFR wellbeing or patient outcomes.