A recent Acute Medicine digest,
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Study Type: Observational study (pre-post with regression discontinuity design)

Key Question: Did Australia's minimum age-16 law for social media accounts reduce adolescent social media use in the three months following implementation?

Key Findings:

• Over 85% of under-16s still reported using regulated platforms at three-month follow-up, predominantly via their own accounts (54–68%)
• Circumvention was common: 15–19% used fake accounts; 6–11% accessed via private browsers; age verification was largely limited to self-declaration or selfies
• Regression discontinuity analyses found no statistically significant reduction in daily use or time spent at the age-16 threshold (p≥0.60)

Clinical Relevance: As the UK considers similar age-based social media restrictions, this provides early real-world evidence that legislative minimum age requirements alone are unlikely to meaningfully reduce adolescent exposure without robust verification infrastructure.

Limitations: Small sample (n=408), short follow-up (three months), and self-reported outcomes introduce significant measurement and maturation bias.

Study Type: Retrospective cohort study

Key Question: Does a higher neutrophil-to-lymphocyte ratio (NLR ≥2.26) correlate with greater disease severity and cardiovascular risk in stable COPD?

Key Findings:

• Patients with NLR ≥2.26 had significantly worse spirometry (lower FEV₁, higher residual volume), higher PaCO₂, and more severe exacerbations in the preceding year (p<0.05)
• Chronic respiratory failure, atrial fibrillation, and lung cancer were significantly more frequent in the high-NLR group
• High NLR was associated with a significantly greater 10-year cardiovascular risk using ESC risk scoring

Clinical Relevance: NLR is a cheap, readily available routine blood test; if validated prospectively, it could help UK acute medicine clinicians risk-stratify stable COPD patients for cardiovascular and respiratory complications without additional cost.

Limitations: Single-centre retrospective design in a pulmonary rehabilitation population limits generalisability to broader acute medicine COPD cohorts.

Study Type: Commentary/Editorial

Key Question: Is epicardial adipose tissue (EAT) ready for routine clinical use as an imaging biomarker?

Key Findings:

• Measurement standardisation and reproducibility remain unresolved barriers to clinical translation of EAT
• EAT has not yet been shown to add meaningful prognostic value beyond established metabolic and imaging markers
• Emerging tissue quality indices (density, perivascular fat attenuation/FAI) lack validated thresholds and outcome-based evidence

Clinical Relevance: For UK acute medicine clinicians encountering CT-derived cardiac imaging reports, this commentary cautions against over-interpreting EAT measurements as actionable biomarkers until pragmatic outcome trials are completed.

Limitations: As an editorial responding to a prior exchange, it presents no original data and does not systematically review the existing evidence base.

Study Type: Retrospective cohort study

Key Question: Does SARS-CoV-2 infection independently worsen in-hospital outcomes in patients hospitalised with heart failure, and does viral load or variant type further modify risk?

Key Findings:

• SARS-CoV-2 infection (11.5% of 2826 HF admissions) independently increased in-hospital mortality (aOR 2.60), invasive ventilation (aOR 2.76), and ICU admission (aOR 1.95), with prolonged hospitalisation of approximately 9 days.
• Higher viral burden (lower Ct value) independently predicted mortality (aOR 0.90 per unit Ct increase, p=0.039).
• Pre-Omicron variants carried substantially higher mortality and ICU utilisation than Omicron sublineages.

Clinical Relevance: HF patients admitted to UK acute medicine units with concurrent SARS-CoV-2 remain a very high-risk group warranting early escalation planning, regardless of dominant circulating variant.

Limitations: Single-centre or registry-based retrospective design limits generalisability, and residual confounding cannot be excluded despite multivariable adjustment.

Study Type: Prospective cohort study

Key Question: How common is low-renin hypertension in patients with adrenal incidentalomas, and does aldosterone-targeted therapy improve outcomes across all aldosterone levels?

Key Findings:

• 47% (138/290) of hypertensive patients with adrenal incidentalomas had suppressed renin, regardless of whether aldosterone was overtly elevated
• Aldosterone-targeted therapy (75% mineralocorticoid receptor antagonist, 25% adrenalectomy) produced clinically significant SBP reductions across all aldosterone categories: −18, −26, and −30 mmHg in groups with PAC 5–10, 10–15, and >15 ng/dL respectively (all p<0.001)
• Higher aldosterone correlated with resistant hypertension, greater antihypertensive burden, hypokalaemia, and reduced eGFR (p-trend <0.001)

Clinical Relevance: In UK acute medicine, adrenal incidentalomas are frequently encountered; this study supports routine renin measurement in hypertensive patients with incidentalomas, potentially identifying treatable disease even without overt primary hyperaldosteronism.

Limitations: Single-centre prospective cohort without a control arm limits causal inference and generalisability.

Study Type: Multi-centre cohort study

Key Question: How do renal and hepatic impairment affect the likelihood of supratherapeutic anticoagulant levels in emergency department patients on DOACs versus phenprocoumon?

Key Findings:

• Apixaban (OR 0.41, 95% CI 0.25–0.69) and edoxaban (OR 0.30, 95% CI 0.10–0.90) had significantly lower rates of supratherapeutic levels than phenprocoumon (28.5%)
• Renal impairment independently increased supratherapeutic DOAC levels (OR 1.55), most markedly with apixaban (OR 2.23); renal function did not significantly affect phenprocoumon levels
• Hepatic dysfunction (MELD score) raised supratherapeutic risk for both, but more steeply for phenprocoumon (OR 5.26) than DOACs (OR 3.46)

Clinical Relevance: In UK acute medicine, where DOACs predominate, this supports checking drug levels in DOAC patients presenting with acute kidney injury, as supratherapeutic exposure—and bleeding risk—may be underappreciated.

Limitations: Phenprocoumon (not warfarin) was the VKA comparator, limiting direct applicability to UK practice.

Study Type: Narrative review / commentary

Key Question: Why has AI adoption in clinical laboratory medicine lagged behind other medical specialties, and what barriers impede translation into practice?

Key Findings:

• Three core barriers identified: insufficient model robustness for complex laboratory data; training datasets lacking scale, diversity, and operational representativeness; and regulatory constraints limiting both data acquisition and model deployment
• Progression from autoverification and classical machine learning to foundation/generative models is traced, with limitations identified at each stage
• Federated learning and large-scale data initiatives are proposed as potential mechanisms to address dataset and regulatory barriers

Clinical Relevance: As NHS laboratories face increasing demand, understanding why AI tools fail to reach deployment helps acute medicine clinicians critically appraise vendor claims and engage meaningfully with digital transformation strategies.

Limitations: As a narrative review without systematic methodology, conclusions reflect authors' perspectives and may not capture the full breadth of existing evidence.

Study Type: Retrospective cohort study (difference-in-differences analysis)

Key Question: Does restructuring a regional hospital into specialised facilities affect emergency department quality metrics?

Key Findings:

• Post-restructuring, paediatric ED visits surged 74.3% (22,510→39,226), while general medicine visits fell 26.4%
• Non-paediatric specialties showed significant efficiency gains: Door-to-Physician Time −8.97%, Physician-to-Departure Time −17.92%, Decision-to-Departure Time −24.56% (all p<0.001)
• Paediatric services deteriorated relative to controls: Door-to-Physician Time +18.7 min, Physician-to-Departure Time +14.6 min, Decision-to-Departure Time +4.9 min (all p<0.001), though remained within clinically acceptable thresholds

Clinical Relevance: As NHS trusts explore site specialisation and reconfiguration, this study highlights the risk of demand surges overwhelming the designated specialist service, with direct implications for paediatric emergency capacity planning.

Limitations: Single-centre Taiwanese setting limits generalisability to NHS acute care configurations and patient demographics.