Daily Anesthesiology Research Analysis
Analyzed 40 papers and selected 3 impactful papers.
Summary
Today's most impactful studies include a large prospective multicentre cohort showing that additional perioperative antimicrobial prophylaxis doses did not reduce surgical-site infections but increased adverse effects, a randomized trial finding similar functional outcomes after craniotomy versus decompressive craniectomy for acute subdural hematoma, and a meta-analysis indicating that EEG-guided anesthesia lowers postoperative delirium but has uncertain effects on longer-term cognitive dysfunction.
Research Themes
- Perioperative antimicrobial stewardship and patient safety
- Randomized evidence for neurosurgical operative strategy
- EEG-guided anesthesia and postoperative brain health
Selected Articles
1. Safety of routine antimicrobial prophylaxis for surgery (SAPPHIRE): a prospective multi-centre cohort study.
In this prospective cohort of 13,646 patients across 26 UK hospitals, increasing the number of antimicrobial prophylaxis doses was not associated with lower 30-day surgical-site infection rates. Higher exposure was associated with more antimicrobial-related side effects and postoperative complications, supporting protocol adherence and avoidance of unnecessary doses.
Impact: This large, contemporary multicentre study directly challenges the assumption that more perioperative prophylactic antibiotic doses improve infection prevention. Its safety findings have immediate implications for antimicrobial stewardship, surgical protocols, and perioperative anesthesia practice.
Clinical Implications: Clinicians should avoid extending surgical antimicrobial prophylaxis beyond evidence-based protocols unless a specific indication exists. Perioperative teams should monitor for antimicrobial toxicity and prioritize timely discontinuation after the recommended dosing window.
Key Findings
- Among 13,646 analyzed patients, 8.0% developed a surgical-site infection within 30 days.
- Increasing prophylactic antibiotic doses was not associated with reduced surgical-site infection risk.
- Antimicrobial-related side effects and postoperative complications increased with greater antibiotic exposure; more than 10 doses were associated with a 4.2% increase in side effects and a 6.2% increase in complications.
Methodological Strengths
- Prospective multicentre design involving 26 UK hospitals and 13,646 analyzable patients.
- Pre-specified registration and assessment of both infection outcomes and clinically relevant antimicrobial toxicities.
Limitations
- The observational design limits causal inference regarding antibiotic dose and outcomes.
- Only six common surgical procedures in UK hospitals were studied, which may limit generalizability to other procedures and healthcare systems.
Future Directions: Future research should evaluate implementation strategies that reduce unnecessary prophylaxis, examine procedure-specific dosing policies, and determine whether protocol-based de-escalation improves antimicrobial safety without increasing infection rates.
BACKGROUND: Prophylactic antimicrobial drugs are routinely administered for most surgical procedures worldwide. However, the benefit may be modest and supported by low-certainty evidence, while little is known about safety in contemporary practice. METHODS: Observational study in 26 UK hospitals between 2022 and 2024. Eligible patients were aged ≥18 years undergoing any of six common surgical procedures. The exposure was the number of antimicrobial doses administered before, during or after surgery to prevent infection. The primary outcome was surgical site infection (SSI) within 30 days after surgery.
2. Decompressive craniectomy versus craniotomy for patients undergoing surgical evacuation of an acute subdural hematoma: RESCUE-ASDH RCT and cost effectiveness.
In this international multicentre randomized trial of 450 patients with traumatic acute subdural hematoma, craniotomy and decompressive craniectomy produced similar 12-month functional outcomes. Craniotomy required additional surgery more often, whereas decompressive craniectomy caused more wound complications and was not considered more cost-effective.
Impact: This pragmatic randomized trial addresses a long-standing emergency neurosurgical controversy with patient-centred and economic outcomes. Its negative result supports individualized operative selection rather than routine decompressive craniectomy for acute subdural hematoma evacuation.
Clinical Implications: For patients undergoing evacuation of traumatic acute subdural hematoma, decompressive craniectomy should not be assumed to provide superior functional recovery. The choice between craniotomy and decompressive craniectomy should incorporate intracranial pressure risk, brain swelling, likelihood of reoperation, wound complications, and institutional expertise.
Key Findings
- Four hundred and fifty patients were randomized: 228 to craniotomy and 222 to decompressive craniectomy.
- Twelve-month functional outcomes measured by the extended Glasgow Outcome Scale were similar between groups.
- Additional surgery occurred more often after craniotomy, whereas wound complications were more frequent after decompressive craniectomy; craniotomy was estimated to provide better value for money.
Methodological Strengths
- International, multicentre, pragmatic randomized controlled trial with intention-to-treat analysis.
- Included long-term functional outcomes and a formal UK-based cost-effectiveness evaluation.
Limitations
- Surgeons and treating clinicians were not blinded to treatment allocation.
- There was some crossover and non-adherence to assigned treatment, and the trial population may not represent patients in whom randomization was considered unsuitable.
Future Directions: Further studies should identify clinical or imaging characteristics that predict benefit from either procedure, evaluate long-term rehabilitation and cranioplasty outcomes, and refine patient-specific algorithms for emergency surgical decision-making.
BACKGROUND: Traumatic acute subdural haematomas often require surgical evacuation via craniotomy or decompressive craniectomy. Decompressive craniectomy may prevent intracranial hypertension; however, it is unclear whether it is associated with better outcomes. OBJECTIVE: Multicentre, pragmatic, parallel-group randomised trial to compare the clinical and cost-effectiveness of decompressive craniectomy versus craniotomy for evacuation of acute subdural haematomas. DESIGN: International, multicentre, pragmatic, parallel-group randomised trial with additional observational arm.
3. Effect of electroencephalography-guided general anesthesia on postoperative delirium : A meta-analysis of randomized controlled trials.
This meta-analysis of 18 randomized trials found that EEG-guided anesthesia reduced postoperative delirium incidence by approximately 23% and shortened the duration of EEG suppression. However, it did not demonstrate a statistically significant reduction in postoperative cognitive dysfunction at 1 week or 1–3 months.
Impact: The study synthesizes randomized evidence on a practical anesthesia-monitoring strategy aimed at preventing an important postoperative neurological complication. The discordance between delirium reduction and lack of proven longer-term cognitive benefit appropriately emphasizes both clinical promise and the limits of current evidence.
Clinical Implications: EEG-guided titration may be considered, particularly in patients at high risk of postoperative delirium, to avoid excessively deep anesthesia and prolonged EEG suppression. It should not yet be presented as a proven strategy for preventing longer-term postoperative cognitive dysfunction.
Key Findings
- Across 18 studies, EEG-guided anesthesia significantly reduced postoperative delirium incidence (RR 0.77, 95% CI 0.64–0.92; p = 0.0046).
- EEG-guided anesthesia significantly reduced the duration of EEG suppression (SMD −0.57, 95% CI −0.90 to −0.25).
- No significant benefit was demonstrated for postoperative cognitive dysfunction at 1 week or 1–3 months.
Methodological Strengths
- Systematic synthesis of randomized controlled trials with pooled relative risks and standardized mean differences.
- Evaluated both immediate neurological outcomes and postoperative cognitive outcomes at multiple time points.
Limitations
- The abstract does not provide detailed information on heterogeneity, risk-of-bias assessments, or the specific EEG-guidance protocols used across trials.
- Definitions and assessment methods for postoperative delirium and cognitive dysfunction may have varied among included studies.
Future Directions: Future large, prospectively registered trials should standardize EEG targets, delirium ascertainment, anesthetic protocols, and long-term cognitive follow-up, while identifying patient subgroups most likely to benefit from EEG-guided anesthesia.
BACKGROUND: Postoperative delirium (POD) is a common and serious complication. Electroencephalography (EEG)-guided anesthesia has been proposed as a method to minimize excessive depth of anesthesia and potentially reduce the incidence of POD. OBJECTIVE: This study was conducted to evaluate the effect of EEG-guided anesthesia on POD incidence. METHODS: To identify relevant trials a comprehensive search across several electronic databases was performed. The primary outcome was the incidence of POD, while secondary outcomes included duration of EEG suppression and postoperative cognitive dysfunction (POCD) at 1 week and between 1 and 3 months postoperatively.