Daily Anesthesiology Research Analysis
Three perioperative studies stand out today: a large multicenter RCT shows lateral positioning markedly reduces hypoxemia during sedation; a meta-analysis with trial sequential analysis confirms dexmedetomidine lowers postoperative delirium and atrial fibrillation after cardiac surgery; and a multicenter cohort links vancomycin guideline non-adherence to higher surgical site infections, underscoring antibiotic stewardship.
Summary
Three perioperative studies stand out today: a large multicenter RCT shows lateral positioning markedly reduces hypoxemia during sedation; a meta-analysis with trial sequential analysis confirms dexmedetomidine lowers postoperative delirium and atrial fibrillation after cardiac surgery; and a multicenter cohort links vancomycin guideline non-adherence to higher surgical site infections, underscoring antibiotic stewardship.
Research Themes
- Airway and respiratory safety during procedural sedation
- Delirium prevention strategies in cardiac surgery
- Perioperative antibiotic stewardship and SSI prevention
Selected Articles
1. Effect of lateral versus supine positioning on hypoxaemia in sedated adults: multicentre randomised controlled trial.
In a multicenter RCT of 2143 analyzed adults undergoing sedation, lateral positioning significantly reduced hypoxemia compared with supine positioning and lowered the need for airway rescue interventions, without safety trade-offs. The benefits were observed across centers, supporting lateral positioning as a simple, scalable respiratory strategy during procedural sedation.
Impact: A large, pragmatic RCT demonstrates that a no-cost positional intervention reduces hypoxemia during sedation, with immediate applicability across diverse settings.
Clinical Implications: Adopt lateral positioning as a default during procedural sedation to lower hypoxemia risk and reduce airway rescue interventions, especially in resource-constrained settings.
Key Findings
- Lateral positioning significantly reduced the incidence and severity of hypoxemia versus supine.
- Lateral position decreased the need for airway rescue interventions during sedation.
- No safety compromise was observed, supporting lateral positioning as a routine strategy.
Methodological Strengths
- Prospective multicenter randomized controlled design with large sample size
- Stratified randomization by center and pre-specified outcomes
Limitations
- Generalizability to very high-risk subgroups (e.g., extreme obesity, very elderly) requires replication
- Blinding to positioning is not feasible, potentially introducing performance bias
Future Directions: Replicate in high-BMI and frail populations, and integrate with oxygen supplementation and airway adjunct protocols to define optimal bundles.
OBJECTIVES: To evaluate the effect of lateral versus supine positioning on incidence of hypoxaemia in sedated patients and to provide evidence based recommendations for respiratory strategies. DESIGN: Prospective, multicentre, randomised controlled trial. SETTING: 14 tertiary hospitals in China, July to November 2024. PARTICIPANTS: 2159 adults (≥18 years) who underwent sedation. INTERVENTIONS: Sedated patients were randomly assigned (1:1) to receive either lateral positioning or conventional supine positioning, stratified by study centres. MAIN OUTCOME MEASURES: The primary outcome was incidence of hypoxaemia (peripheral oxygen saturation (SpO
2. Dexmedetomidine for the prevention of postoperative delirium in patients undergoing cardiac surgery: a systematic review and meta-analysis with trial sequential analysis.
Across 32 RCTs (n=6046), dexmedetomidine significantly reduced postoperative delirium after cardiac surgery (RR 0.67) and also lowered postoperative atrial fibrillation (RR 0.82). Trial sequential analysis indicated sufficient cumulative evidence for POD reduction, supporting clinical adoption while optimizing dosing and timing.
Impact: Synthesizing randomized evidence with trial sequential analysis provides robust confirmation that an anesthetic adjunct reduces delirium and atrial arrhythmias after cardiac surgery.
Clinical Implications: Consider dexmedetomidine in cardiac surgery care pathways to lower delirium and atrial fibrillation, balancing benefits with bradycardia/hypotension risks and tailoring dose/timing.
Key Findings
- Dexmedetomidine reduced postoperative delirium after cardiac surgery (RR 0.67, 95% CI 0.59–0.76).
- Trial sequential analysis indicated sufficient evidence for the delirium endpoint.
- Postoperative atrial fibrillation was also reduced (RR 0.82, 95% CI 0.74–0.92).
Methodological Strengths
- Inclusion of randomized controlled trials only with comprehensive database search
- Use of trial sequential analysis to assess conclusiveness and control random errors
Limitations
- Heterogeneity in dosing regimens, timing, and co-interventions across trials
- Overall evidence quality rated low to moderate; potential publication bias
Future Directions: Head-to-head RCTs to define optimal dosing and timing windows, and implementation trials integrating delirium prevention bundles.
BACKGROUND: The efficacy of dexmedetomidine in preventing postoperative delirium (POD) following cardiac surgery remains controversial. This systematic review aimed to evaluate whether dexmedetomidine could prevent POD in patients undergoing cardiac surgery. METHODS: PubMed, CENTRAL, and Embase were searched up to 1 November 2024. Randomized controlled trials (RCTs) concerning dexmedetomidine for preventing POD in patients undergoing cardiac surgery were included. The primary outcome was the incidence of POD, and the secondary outcome was the incidence of postoperative atrial fibrillation (POAF). The analyses were performed using RevMan 5.3 and R 4.4.2 to calculate risk ratio (RR) with 95% confidence interval (CI). Trial sequential analysis (TSA) was conducted using TSA 0.9.5.10 Beta. RESULTS: Thirty-two studies with 6046 participants were included. Dexmedetomidine notably reduced the incidence of POD (RR = 0.67, 95% CI 0.59-0.76, P < 0.00001), with sufficient evidence and conclusive result from TSA. Dexmedetomidine was more effective in preventing POD compared with both positive control (RR = 0.47, 95% CI 0.38-0.59, P < 0.00001) and placebo control (RR = 0.83, 95% CI 0.70-0.98, P = 0.02). It reduced the incidence of POD not only in elderly patients (RR = 0.66, 95% CI 0.54-0.81, P < 0.0001) but also in normal age patients (RR = 0.68, 95% CI 0.57-0.80, P < 0.00001). Moreover, dexmedetomidine decreased the incidence of POAF (RR = 0.82, 95% CI 0.74-0.92, P = 0.0005). CONCLUSIONS: Dexmedetomidine could reduce the incidence of POD in patients undergoing cardiac surgery and was associated with a decreased incidence of POAF. The findings should be interpreted with caution because of the low to moderate quality of evidence. Further trials are still needed to explore the optimal regimen of dexmedetomidine. REGISTRATION NUMBER: INPLASY2024110008.
3. Association of Prophylactic Antibiotic Guideline Non-Adherence with Surgical Site Infections in Patients Receiving Perioperative Vancomycin: Results from a Multi-Institutional Combined NSQIP and MPOG Registry.
In 5542 noncardiac surgeries with perioperative vancomycin, guideline non-adherence—particularly inappropriate antibiotic choice and mistimed administration—was independently associated with higher surgical site infection risk. Timing and stewardship of vancomycin matter, reinforcing adherence to IDSA/SIS/SHEA recommendations.
Impact: Multi-institutional real-world evidence links specific elements of perioperative antibiotic practice to SSI risk, enabling actionable stewardship and workflow changes.
Clinical Implications: Limit vancomycin to guideline-indicated scenarios and ensure correct pre-incision timing; audit perioperative antibiotic workflows to improve adherence and reduce SSIs.
Key Findings
- Among 5542 cases, SSI incidence was 5.6%.
- Non-adherence to antibiotic choice was associated with higher SSI risk (RR 1.64, 95% CI 1.17–2.31).
- Mistimed vancomycin administration was associated with increased SSI risk (RR 1.56, 95% CI 1.01–2.40).
Methodological Strengths
- Large, multicenter dataset integrating MPOG, NSQIP, and MSQC with hierarchical modeling
- Explicit assessment of distinct guideline domains (choice, dose, timing)
Limitations
- Observational design with potential residual confounding (e.g., MRSA risk, colonization status)
- Findings limited to vancomycin recipients; may not generalize to other prophylactic agents
Future Directions: Prospective stewardship interventions to improve timing and selection, and evaluation of SSI outcomes; explore patient-level risk stratification to guide prophylaxis.
OBJECTIVE: To investigate whether non-adherence to the combined Infectious Disease Society of America (IDSA), the Surgical Infection Society (SIS), and the Society for Healthcare Epidemiology of America (SHEA) guideline based antibiotic choice, timing, and/or dose of vancomycin was associated with Surgical Site infections in surgeries where vancomycin was administered. SUMMARY BACKGROUND DATA: Despite the pivotal role of antibiotics in preventing surgical site infections (SSIs), widespread non-adherence to IDSA/SIS/SHEA guidelines especially related to vancomycin for intraoperative antibiotic prophylaxis continues. It is unclear whether this non-adherence is associated with SSIs. METHODS: In this multicenter observational study, we utilized integrated data from Multicenter Perioperative Outcomes Group (MPOG) registry, the National Surgical Quality Improvement Program (NSQIP) and Michigan Surgical Quality Collaborative (MSQC) registries encompassing 31 academic and community hospitals for surgeries from 01/01/2014 to 08/31/2022. Patients over 18 years of age who underwent non-cardiac procedures involving a skin incision and who were administered Vancomycin were included. The co-primary exposures were non-adherence to IDSA/SIS/SHEA guidelines with respect to choice, dose, or timing, and the primary outcome was NSQIP/MSQC-coded SSI. A hierarchical generalized linear mixed model with surgical patients nested within MPOG institutions was performed. RESULTS: A total of 5542 unique cases met the inclusion criteria, 55.5% participants were women, and the mean (SD) age was 60.0 (14.3) years. The incidence of SSI was 5.6% in the cohort. Non-adherence to guideline-based antibiotic choice, dosing and timing was 705 (12.7%), 59 (1.1%) and 197 (3.6%) respectively. In adjusted analysis, non-adherence to antibiotic choice [RR (95% CI): 1.64 (1.17, 2.31), P =0.004], and timing [RR (95% CI): 1.56 (1.01, 2.40), P=0.043] were significantly independently associated with SSI. CONCLUSIONS: Guideline adherent antibiotic choice (IDSA/SIS/SHEA metric) and time of vancomycin administration (IDSA/SIS/SHEA and SCIP metric) are associated with reduced odds of Surgical Site Infections in patients receiving perioperative vancomycin prophylaxis.