Daily Anesthesiology Research Analysis
Analyzed 41 papers and selected 3 impactful papers.
Summary
The most clinically consequential findings concern perioperative management of patients receiving glucagon-like peptide-1 receptor agonists, regional analgesia in traumatic rib fractures, and long-term neurobiological effects of anesthesia and surgery. Prospective endoscopy data suggest that extended solid-food fasting may be more informative than medication interruption alone, while observational trauma data associate early treatment-goal uncertainty with reduced regional analgesia use and respiratory deterioration. A mechanistic mouse study identifies sex-dependent extracellular-vesicle signaling as a potential contributor to chronic postoperative neurological dysfunction.
Research Themes
- Perioperative management of GLP-1 receptor agonists and aspiration risk
- Regional analgesia and respiratory outcomes after traumatic rib fractures
- Sex-dependent mechanisms of chronic neurological dysfunction after anesthesia and surgery
Selected Articles
1. Glucagon-like peptide-1 receptor agonists and retained gastric contents on endoscopy: a prospective observational study.
In 256 patients undergoing elective endoscopy, retained gastric contents occurred in 8% of GLP-1 receptor agonist users and 6% of controls, with no statistically significant difference. No aspiration events or procedure cancellations occurred under the study’s preprocedural regimen, which included holding GLP-1 receptor agonists for 1 week and a 24-hour clear-liquid diet.
Impact: This prospective study directly informs an evolving and controversial perioperative safety question. Its findings suggest that prolonged solid-food or clear-liquid preparation may be a viable alternative framework to relying solely on prolonged medication interruption, although the study is not large enough to assess rare aspiration events.
Clinical Implications: For patients receiving GLP-1 receptor agonists who undergo elective upper endoscopy, clinicians may consider procedure-specific fasting protocols and individualized risk assessment rather than automatically applying prolonged drug cessation. The absence of aspiration events should not be interpreted as proof of zero risk.
Key Findings
- Retained gastric contents occurred in 8% of GLP-1 receptor agonist users versus 6% of controls, with P = 0.55.
- No aspiration events, procedure abortions, or relevant conversions to general anesthesia occurred.
- The protocol included holding GLP-1 receptor agonists for 1 week and a 24-hour clear-liquid diet.
Methodological Strengths
- Prospective observational design directly assessed retained gastric contents during endoscopy.
- The study evaluated a clinically relevant perioperative protocol and reported procedural safety outcomes.
Limitations
- The sample size was small for detecting rare aspiration events.
- The findings may not generalize to patients who continue GLP-1 receptor agonists or follow standard fasting without a 24-hour clear-liquid diet.
- Endoscopy-based assessment of gastric contents is an imperfect surrogate for actual aspiration risk.
Future Directions: Large prospective multicenter studies should compare medication continuation, different interruption intervals, and varied solid- and liquid-fasting protocols, while capturing aspiration and respiratory outcomes. Gastric ultrasonography could provide an additional standardized perioperative assessment.
PURPOSE: Retrospective evidence suggests that glucagon-like peptide-1 receptor agonists (GLP-1 RAs) are associated with retained gastric contents (RGC) after standard 8-hr fasting, possibly increasing aspiration risk. The primary aim of this study was to compare the incidence of RGC on upper endoscopy after appropriate preoperative fasting in patients taking GLP-1 RAs vs patients not taking GLP-1 RAs. METHODS: We conducted prospective observational study of 256 patients scheduled for elective endoscopy involving stomach visualization. The primary outcome was RGC, defined as solid content or liquid-only content > 1.5 mL·kg RESULTS: There was no statistically significant difference in the incidence of RGC between patients taking GLP-1 RAs (8%) vs controls (6%, P = 0.55). There were no occurrences of aspiration events, procedure abortion, or relevant conversion to general anesthesia.
2. Early treatment goal uncertainty as a barrier to regional analgesia and respiratory deterioration in traumatic rib fractures: a propensity-weighted analysis.
Among 236 ICU patients with multiple rib fractures, early treatment-goal uncertainty was present in 39.8% and was associated with respiratory deterioration (adjusted odds ratio 2.48; 95% CI 1.35–4.58). Regional analgesia was used less often in patients with high uncertainty and was associated with lower odds of respiratory deterioration than systemic-dominant analgesia (adjusted odds ratio 0.44; 95% CI 0.23–0.85).
Impact: This study reframes respiratory deterioration after rib fractures as partly related to care-process variability, not only injury severity. Although causality cannot be established, the findings support early goal clarification and standardized multidisciplinary pathways for regional analgesia.
Clinical Implications: Trauma and critical-care teams should establish analgesic and respiratory goals early, assess eligibility for regional analgesia, and use multidisciplinary protocols to reduce delays or indecision. Regional analgesia should not be assumed to be causally protective until tested in interventional studies.
Key Findings
- High early treatment-goal uncertainty occurred in 39.8% of patients.
- High uncertainty was associated with respiratory deterioration with an adjusted odds ratio of 2.48.
- Regional analgesia was less frequently used with high uncertainty and was associated with lower respiratory deterioration odds than systemic-dominant analgesia.
Methodological Strengths
- Blinded medical-record review operationalized treatment-goal uncertainty as a care-process variable.
- Propensity-score overlap weighting and adjusted regression were used to address measured confounding.
Limitations
- This was a single-center observational study and residual confounding is likely.
- Treatment-goal uncertainty is a process-level construct that may be difficult to measure consistently across institutions.
- The study cannot establish that regional analgesia prevents respiratory deterioration.
Future Directions: Prospective multicenter studies should standardize definitions of treatment-goal uncertainty and test early multidisciplinary rib-fracture pathways using regional analgesia, respiratory monitoring, and predefined escalation criteria. Pragmatic randomized trials would be especially valuable.
PURPOSE: Patients with multiple rib fractures (≥ 3) admitted to the intensive care unit (ICU) are at high risk of early respiratory deterioration, for which timely and effective analgesia is essential. Although multimodal analgesic strategies are widely recommended, their real-world implementation may be influenced by variability in early clinical decision-making, including treatment goal uncertainty (TGU). We aimed to investigate the association between early TGU, analgesic strategy selection, and respiratory outcomes in critically injured patients with rib fractures. METHODS: This single-center observational cohort study included 236 adult ICU patients with ≥ 3 radiologically confirmed rib fractures who did not require invasive mechanical ventilation at admission (2020-2024). TGU within the first 48 h was assessed using blinded electronic medical record review as a process-level marker of variability in early care prioritization. Analgesic strategies were categorized as regional-based analgesia (RA), systemic-dominant analgesia (SA), or multimodal conservative management.
3. Sex-dependent chronic neurological dysfunction following isoflurane anesthesia and surgery is associated with circulating extracellular vesicle-mediated neuroinflammatory signaling.
In young adult mice, isoflurane anesthesia combined with laparotomy produced persistent olfactory impairment in both sexes and greater cognitive and associative-learning deficits in females at 12 weeks. Sex-divergent transcriptomic changes and altered circulating extracellular-vesicle abundance and protein cargo were observed, and extracellular vesicles from exposed animals induced inflammatory remodeling after hippocampal injection.
Impact: The study provides a novel mechanistic framework linking anesthesia and surgery to long-term, sex-dependent neurological dysfunction through circulating extracellular vesicles. It is scientifically important despite being a preprint because it integrates behavioral, transcriptomic, proteomic, and functional-transfer experiments.
Clinical Implications: The findings support further investigation of sex-specific vulnerability and extracellular-vesicle biomarkers or therapeutic targets for postoperative neurocognitive disorders. They do not yet justify changing anesthetic practice because the model used young mice and combined anesthesia with laparotomy.
Key Findings
- Isoflurane plus laparotomy caused persistent olfactory impairment in both sexes, with greater deficits in females.
- Female mice showed greater hippocampal-dependent spatial working-memory and associative-learning impairment at 12 weeks.
- Circulating extracellular vesicles showed sex-specific changes in abundance, size distribution, and inflammatory protein cargo, and transferred vesicles induced cytokine remodeling.
Methodological Strengths
- The study used multiple behavioral paradigms and assessed long-term outcomes 12 weeks after exposure.
- Mechanistic triangulation combined brain RNA sequencing, extracellular-vesicle characterization, Olink proteomics, and functional vesicle-transfer experiments.
Limitations
- The work is a bioRxiv preprint and has not undergone completed peer review.
- The study used young adult C57BL/6 mice, limiting direct extrapolation to older or clinically vulnerable patients.
- Anesthesia and laparotomy were combined, so the independent effects of isoflurane and surgical stress cannot be fully separated.
- The extracellular-vesicle transfer experiment used hippocampal injection into naïve male mice, which does not reproduce normal systemic exposure.
Future Directions: Replication in peer-reviewed studies should include aged and disease-vulnerable animals, anesthesia-only and surgery-only controls, and both-sex systemic transfer experiments. Clinical studies should evaluate whether extracellular-vesicle signatures predict postoperative neurocognitive outcomes and whether they are modifiable.
PURPOSE: It is well established that volatile anesthetics and surgery induce acute and subacute changes in the cellular and molecular landscape of the brain and peripheral circulation and can impair neurological function. However, the chronic neurological sequelae of isoflurane (Iso) anesthesia combined with surgical operation (OP), as well as the underlying mechanisms of postoperative neurological dysfunction, remain poorly understood. METHODS: Young adult male (M) and female (F) C57BL/6 mice underwent 4 h of 2% Iso plus laparotomy or sham treatment. At 12 weeks, olfactory and cognitive function were assessed by odor memory, buried food, Y-maze, and active avoidance tests. Olfactory bulbs (OB) and hippocampi (HI) were collected for RNAseq, while plasma extracellular vesicles (EVs) were isolated, characterized by NanoFCM, and profiled by Olink proteomics. Lastly, EVs were injected into the HI of naïve male mice, and cytokine/chemokine responses were measured 24 h later.