Quarterly ReportJan 1 – Mar 31, 2025
Anesthesiology, Q1 2025 edition
We read 270 papers and selected 10.
Summary
The quarter marked a shift from broad perioperative interventions toward mechanism-based, phenotype-guided anesthesiology. Large randomized and evidence-synthesis studies strengthened respiratory safety, cardiac-surgical blood management, perfusion-system design, prehabilitation, and individualized anesthetic selection. Translational work identified new biological mechanisms, including rocuronium-specific IgE epitopes, Piezo2-mediated vascular mechanosensation, and cortical circuit control of burst suppression. Methodological advances in EHR-omics transfer learning and multimodal physiologic interpretation created infrastructure for future precision perioperative research. Several studies also clarified limits of universal policies, supporting targeted implementation rather than blanket adoption of benzodiazepine restriction, TIVA, or other single-strategy approaches. Overall, the most durable scientific contributions combined clinically relevant randomized evidence with methods or mechanisms that can shape subsequent research programs.
Selected Articles
1. A machine learning approach to leveraging electronic health records for enhanced omics analysis.
COMET is a transfer-learning framework that pretrains on large observational EHR datasets and integrates clinical and omics data from smaller cohorts. Across two independent datasets, it improved prediction and biological discovery and enabled more granular patient stratification than binary case-control classification.
Impact: The paper introduces reusable research infrastructure that can strengthen biomarker discovery and precision-risk modeling across anesthesiology and critical care.
Clinical Implications: COMET is not yet a clinical decision tool, but it can support discovery-stage modeling for delirium, acute kidney injury, pulmonary complications, and other perioperative outcomes.
Key Findings
- COMET combines EHR pretraining with adaptive clinical-omics fusion.
- It improved predictive modeling and biological discovery across two independent datasets.
- It enabled finer patient stratification beyond binary case-control labels.
2. Antibody-secreting cell repertoires hold high-affinity anti-rocuronium specificities that can induce anaphylaxis in vivo.
Using single-cell VH/VL sequencing, structural crystallography, and FcεRI-humanized mice, this translational study identified high-affinity human-format anti-rocuronium antibodies. These antibodies activated human effector cells and caused severe anaphylaxis in vivo, while structural analyses mapped distinct epitopes involving the ammonium moiety.
Impact: The study establishes direct mechanistic evidence for rocuronium-specific IgE-mediated anaphylaxis and creates a foundation for epitope-resolved allergy diagnostics.
Clinical Implications: The findings may improve evaluation of suspected neuromuscular-blocker allergy and guide future desensitization or alternative-agent strategies, but clinical validation is required.
Key Findings
- More than 500 VH-VL pairs included antibody families with subnanomolar affinity for rocuronium.
- Human IgE versions activated mast cells and basophils and caused severe anaphylaxis in humanized mice.
- Cocrystal structures identified distinct rocuronium-binding modes involving the ammonium group.
3. Vascular motion in the dorsal root ganglion sensed by Piezo2 in sensory neurons triggers episodic pain.
This mechanistic preclinical study showed that dynamic microvascular motion within injured dorsal root ganglia triggers episodic spontaneous neuropathic pain through Piezo2 mechanotransduction in sensory neurons. Angiogenesis and pericyte alterations amplified clustered neuronal firing, while anti-VEGF or Piezo2-targeting approaches reduced pain behaviors in mice.
Impact: The study introduces a vascular-neural mechanism for neuropathic pain and identifies Piezo2 and angiogenic signaling as potential non-opioid therapeutic targets.
Clinical Implications: Peripherally restricted Piezo2 modulators or vascular-targeted treatments may eventually address refractory spontaneous pain, but human tissue and early clinical validation are needed.
Key Findings
- Microvascular motion in injured dorsal root ganglia triggered spontaneous pain and clustered neuronal firing.
- Piezo2 in sensory neurons was necessary for sensing vascular motion.
- Anti-VEGF or Piezo2-targeted interventions suppressed angiogenesis-linked pain amplification in mice.
4. TAK-925 (Danavorexton), an Orexin Receptor 2 Agonist, Reduces Opioid-induced Respiratory Depression and Sedation without Affecting Analgesia in Healthy Men.
In a double-blind, placebo-controlled crossover phase 1 trial involving 13 healthy men, danavorexton dose-dependently increased minute ventilation, tidal volume, and respiratory rate during remifentanil-induced respiratory depression. It reduced sedation without reducing experimentally measured pain tolerance, and respiratory benefits persisted after infusion.
Impact: This is the first randomized human signal that orexin-2 agonism may reverse opioid-related respiratory depression while preserving analgesia, offering a mechanistically distinct alternative to naloxone-centered rescue.
Clinical Implications: Clinical use is premature, but orexin-2 agonists could eventually provide targeted respiratory stimulation without precipitating analgesia loss or withdrawal if efficacy and safety are confirmed in patient populations.
Key Findings
- Danavorexton increased minute ventilation by approximately 8.2 and 13.0 L/min at low and high doses versus placebo.
- The high dose reduced sedation scores without changing experimentally measured pain tolerance.
- Respiratory improvements persisted after infusion, and adverse events were generally mild.
5. Prothrombin Complex Concentrate vs Frozen Plasma for Coagulopathic Bleeding in Cardiac Surgery: The FARES-II Multicenter Randomized Clinical Trial.
In a pragmatic multicenter randomized trial of approximately 528 analyzed patients, 4-factor PCC was superior to frozen plasma for hemostatic effectiveness during coagulopathic bleeding in cardiac surgery. PCC also reduced allogeneic transfusion exposure and serious adverse events, including postoperative acute kidney injury through day 30.
Impact: This trial provides high-level randomized evidence for a change in cardiac-surgical blood-management algorithms and links factor replacement to patient-centered safety outcomes.
Clinical Implications: Cardiac surgery programs should evaluate PCC-first pathways for selected coagulopathic bleeding, with viscoelastic or laboratory-guided dosing and thrombosis surveillance.
Key Findings
- Hemostatic effectiveness was higher with PCC than frozen plasma: 77.9% versus 60.4%.
- PCC reduced allogeneic transfusion requirements.
- Serious adverse events, including postoperative acute kidney injury, were lower with PCC through day 30.
6. Synchronicity of pyramidal neurones in the neocortex dominates isoflurane-induced burst suppression in mice.
Using EEG, micro-endoscopic calcium imaging, and chemogenetic manipulation, this mouse study showed that isoflurane-induced burst suppression is driven primarily by synchronized cortical pyramidal-neuron activity. Bidirectional manipulation of parvalbumin interneurons altered cortical synchrony and burst suppression.
Impact: The study provides causal circuit-level interpretation of a clinically familiar EEG pattern and may improve mechanistic understanding of anesthetic depth.
Clinical Implications: The findings may support more biologically informative EEG biomarkers, although translation from mice to humans and clinical validation remain necessary.
Key Findings
- Burst suppression was strongly correlated with synchronous cortical pyramidal-neuron activity.
- Chemogenetic manipulation of parvalbumin interneurons bidirectionally changed cortical synchrony and burst suppression.
- Other interneuron classes and subcortical structures showed limited correlation in this model.
7. Effect of high flow nasal cannula oxygenation on incidence of hypoxia during sedated gastrointestinal endoscopy in patients with obesity: multicentre randomised controlled trial.
In a multicentre randomized trial of approximately 984 adults with obesity undergoing sedated gastrointestinal endoscopy, HFNC reduced hypoxia from 21.2% to 2.0%. Severe hypoxia fell from 4.1% to 0%, and subclinical respiratory depression decreased from 36.3% to 5.6%, without an increase in other sedation-related adverse events.
Impact: The large effect size and randomized multicentre design provide unusually strong evidence for a procedural respiratory-safety intervention in a growing high-risk population.
Clinical Implications: HFNC should be considered for obese patients undergoing sedated endoscopy, with appropriate equipment, training, and rescue-escalation pathways.
Key Findings
- HFNC reduced hypoxia incidence from 21.2% to 2.0%.
- Severe hypoxia decreased from 4.1% to 0%.
- Subclinical respiratory depression decreased from 36.3% to 5.6% without increased sedation-related adverse events.
8. Relative efficacy of prehabilitation interventions and their components: systematic review with network and component network meta-analyses of randomised controlled trials.
This network and component network meta-analysis of 186 randomized trials involving 15,684 participants found that exercise and nutritional prehabilitation, alone or combined, reduced postoperative complications and hospital stay. Exercise and nutrition were the dominant components, while psychosocial interventions improved quality of life and functional recovery.
Impact: It provides comparative and component-level evidence for designing perioperative optimization pathways and allocating resources.
Clinical Implications: Programs should prioritize exercise and nutritional optimization, adding psychosocial support when functional recovery and quality of life are major objectives.
Key Findings
- Exercise prehabilitation reduced postoperative complications compared with usual care, with an odds ratio of approximately 0.50.
- Nutritional prehabilitation reduced complications, with an odds ratio of approximately 0.62.
- Exercise and nutrition were the dominant contributors to improved complications, length of stay, quality of life, and function.
9. Minimal invasive extracorporeal circulation versus conventional cardiopulmonary bypass in cardiac surgery: a contemporary systematic review and meta-analysis.
A contemporary meta-analysis of 36 randomized trials involving approximately 4,849 patients found that minimally invasive extracorporeal circulation was associated with lower mortality, fewer myocardial infarctions and cerebrovascular events, less transfusion and bleeding, and shorter ventilation, ICU, and hospital stays than conventional cardiopulmonary bypass.
Impact: The analysis suggests that perfusion-system design can influence hard clinical outcomes rather than only laboratory or transfusion surrogates.
Clinical Implications: Cardiac anesthesia and perfusion teams should assess local feasibility of MiECC with standardized anticoagulation, monitoring, rescue, and staff-training protocols.
Key Findings
- MiECC was associated with lower mortality than conventional cardiopulmonary bypass: odds ratio 0.66.
- Myocardial infarction, cerebrovascular events, transfusion, and re-exploration for bleeding were reduced.
- Ventilation, ICU, and hospital durations were shorter with MiECC.
10. Safety and recovery profile of patients after inhalational anaesthesia versus target-controlled or manual total intravenous anaesthesia: a systematic review and meta-analysis of randomised controlled trials.
This meta-analysis of 385 randomized trials found no difference in serious intraoperative adverse events between TIVA and inhalational anesthesia. TIVA reduced postoperative nausea and vomiting and emergence agitation, whereas inhalational anesthesia was associated with faster recovery and lower costs.
Impact: The synthesis clarifies clinically important trade-offs and supports patient-centered anesthetic selection rather than universal preference for either technique.
Clinical Implications: TIVA may be favored for high PONV or emergence-agitation risk, whereas inhalational anesthesia remains reasonable when rapid recovery, cost, or workflow is prioritized.
Key Findings
- Serious intraoperative adverse events did not differ between TIVA and inhalational anesthesia.
- TIVA reduced postoperative nausea and vomiting and emergence agitation.
- Inhalational anesthesia was associated with faster recovery and lower costs.