Daily Anesthesiology Research Analysis
Analyzed 24 papers and selected 3 impactful papers.
Summary
Today’s most impactful anesthesiology studies addressed regional anesthesia, postoperative inflammation, and evidence synthesis. A randomized study suggested that continuous bilateral erector spinae plane block may reduce both opioid requirements and early postoperative inflammation after coronary artery bypass grafting, while a meta-analysis supported regional blocks for analgesia after robot-assisted transaxillary thyroidectomy. A retrospective prediction study identified potentially modifiable perioperative factors associated with recovery-room delirium after transurethral prostate resection.
Research Themes
- Regional anesthesia and opioid-sparing perioperative care
- Perioperative inflammation and recovery after cardiac surgery
- Prediction and prevention of postoperative delirium
Selected Articles
1. Effect of Continuous Bilateral Erector Spinae Plane Block on Neutrophil-Lymphocyte Ratio in On-Pump CABG: A Prospective Randomized Study.
In this prospective randomized study of 120 adults undergoing on-pump coronary artery bypass grafting, bilateral erector spinae plane block was compared with conventional opioid-based analgesia. The block attenuated the postoperative neutrophil-lymphocyte ratio increase and reduced opioid requirements, suggesting benefits beyond analgesia, although the available abstract does not establish effects on major clinical outcomes.
Impact: This is a randomized clinical study linking a regional anesthetic technique to a biologically relevant inflammatory biomarker in high-risk cardiac surgery. It provides a mechanistic bridge between opioid-sparing analgesia and perioperative immune modulation, while appropriately requiring confirmation using patient-centered outcomes.
Clinical Implications: Bilateral erector spinae plane block may be considered as part of multimodal analgesia for selected on-pump coronary artery bypass grafting patients, particularly when opioid reduction is desirable. The inflammatory findings should not yet be interpreted as proof of improved morbidity or survival.
Key Findings
- The prospective randomized study included 120 adults, with 60 patients assigned to bilateral erector spinae plane block and 60 to conventional opioid-based analgesia.
- The neutrophil-lymphocyte ratio peaked on postoperative day 1 and was lower with erector spinae plane block than with opioid-based analgesia: 13.99 versus 18.58.
- Erector spinae plane block reduced postoperative opioid requirements and was associated with attenuation of the early inflammatory response.
Methodological Strengths
- Prospective randomized comparative design with balanced baseline characteristics.
- Repeated assessment of neutrophil-lymphocyte ratio and clinically relevant secondary outcomes, including opioid consumption and intensive care unit stay.
Limitations
- The sample size was modest and the study was conducted in a specific cardiac surgery population.
- The abstract does not provide definitive evidence that biomarker changes translated into fewer complications, shorter ventilation, or improved survival.
- Blinding of patients and clinicians is difficult for a regional block intervention, creating potential performance and co-intervention bias.
Future Directions: Larger multicenter randomized trials should assess whether inflammatory modulation from erector spinae plane block improves clinically meaningful outcomes such as postoperative complications, atrial fibrillation, mechanical ventilation duration, intensive care unit stay, and mortality. Studies should also compare continuous and single-injection techniques and evaluate cost-effectiveness.
BACKGROUND: Cardiac surgery using cardiopulmonary bypass causes a pronounced systemic inflammatory response. The neutrophil-lymphocyte ratio (NLR) is a readily accessible inflammatory biomarker associated with adverse outcomes after cardiac surgery. Regional anesthesia has been shown to modulate the inflammatory process by various mechanisms. Erector spinae plane (ESP) block reduces nociception and opioid use, but its effect on perioperative inflammatory markers is not well described. This study evaluated whether bilateral ESP block attenuates the perioperative rise in NLR in patients undergoing on-pump coronary artery bypass graft (CABG) surgery.
2. Evidence for regional block-based analgesia in robot-assisted transaxillary thyroidectomy: a systematic review and meta-analysis.
This systematic review and meta-analysis included four studies and 224 patients undergoing robot-assisted transaxillary thyroidectomy. Regional nerve blocks significantly reduced pain in the post-anesthesia care unit and at 4, 24, and 48 hours, but were associated with a small increase in operative time; larger randomized trials remain necessary.
Impact: The study consolidates the limited evidence for regional analgesia in a technically demanding minimally invasive procedure and quantifies the time-pain trade-off. Its findings can inform multimodal analgesic protocols while clearly identifying the uncertainty caused by the small evidence base.
Clinical Implications: Perioperative regional nerve blocks may be incorporated into multimodal analgesia for robot-assisted transaxillary thyroidectomy, particularly to improve pain control during the first postoperative day. Clinicians should balance analgesic benefits against block-related procedures and the modest increase in operative time.
Key Findings
- The meta-analysis included three randomized controlled trials and one retrospective cohort study involving 224 patients: 113 received a regional block and 111 served as controls.
- Regional blocks reduced visual analog scale pain scores at 4 hours, 24 hours, 48 hours, and in the post-anesthesia care unit, with weighted mean differences of -1.44, -1.28, -0.47, and -2.68, respectively.
- Regional block use was associated with a modest increase in operative time of 2.67 minutes.
Methodological Strengths
- Comprehensive searches across four major biomedical databases with explicit search end date.
- Risk-of-bias assessment used RoB 2 for randomized trials and the Newcastle-Ottawa Scale for the cohort study, with pooled effect estimates and 95% confidence intervals.
Limitations
- Only four studies and 224 patients were available, limiting precision and generalizability.
- The evidence base included one retrospective cohort study in addition to randomized trials, introducing design heterogeneity.
- The abstract does not report comprehensive heterogeneity estimates, publication-bias assessment, opioid consumption, or block-related adverse events.
Future Directions: Future multicenter randomized trials should standardize block techniques, local anesthetic regimens, background analgesia, and outcome measurement. Studies should evaluate opioid consumption, functional recovery, patient satisfaction, adverse events, and cost-effectiveness, with subgroup analyses by surgical approach and block type.
To evaluate the analgesic effectiveness of perioperative regional nerve blocks after robot-assisted transaxillary thyroidectomy. A comprehensive search of PubMed, Embase, the Cochrane Library, and Web of Science was performed from database inception through December 31, 2025. Methodological quality was evaluated with the revised Cochrane risk-of-bias tool (RoB 2) for randomized controlled trials and the Newcastle-Ottawa Scale for the retrospective cohort study. Statistical synthesis was performed in Stata version 18.0. Continuous outcomes were pooled as weighted mean differences (WMDs), whereas dichotomous outcomes were expressed as odds ratios (ORs), with both effect measures reported alongside their corresponding 95% confidence intervals.
3. Identification of Risk Factors and Development of a Prediction Model for Recovery Room Delirium Following Transurethral Resection of the Prostate.
This retrospective single-center cohort of 1,166 patients undergoing transurethral resection of the prostate found recovery-room delirium in approximately 20% of patients. Older age, higher American Society of Anesthesiologists physical status, hypoalbuminemia, intraoperative hypothermia, and hypotension were independent predictors, and the internally validated nomogram showed good discrimination.
Impact: Recovery-room delirium is frequent and clinically actionable, yet it is often underrecognized. This study combines a structured delirium assessment with a clinically interpretable prediction model and identifies potentially modifiable intraoperative factors that could support targeted prevention.
Clinical Implications: Perioperative teams may use age, physical status, serum albumin, temperature, and blood pressure to identify patients at elevated risk of recovery-room delirium. The findings support proactive temperature and hemodynamic management and closer postoperative screening, but implementation should await prospective external validation.
Key Findings
- The study retrospectively evaluated 1,166 adults undergoing transurethral resection of the prostate under general anesthesia from 2020 to 2024.
- Recovery-room delirium occurred in 19.5% of the training cohort and 20% of the validation cohort.
- Older age, higher American Society of Anesthesiologists physical status, preoperative hypoalbuminemia, intraoperative hypothermia, and intraoperative hypotension were independent predictors.
- The prediction model achieved an area under the receiver operating characteristic curve of 0.841 in the training cohort and 0.858 in the validation cohort.
Methodological Strengths
- Large cohort with a structured 3-minute Diagnostic Interview for CAM-defined Delirium assessment.
- Random split into training and validation cohorts with multivariable analysis, calibration assessment, and decision curve analysis.
Limitations
- The study was retrospective and conducted at a single center, so selection and information bias are possible.
- The validation cohort was an internal random split rather than an independent external population.
- The model was developed for transurethral prostate resection patients and may not generalize to other surgeries or anesthesia techniques.
- Associations with hypothermia and hypotension do not prove that correcting these factors will prevent delirium.
Future Directions: Prospective multicenter studies should externally validate the model and test whether risk-guided interventions, including active normothermia, optimized blood pressure management, medication review, sleep promotion, and early reorientation, reduce recovery-room delirium. Calibration across diverse age groups, surgical settings, and healthcare systems should also be examined.
PURPOSE: To identify independent risk factors for recovery room delirium (RRD) in patients undergoing transurethral resection of the prostate (TURP) and to develop a predictive model for early identification of high-risk patients. PATIENTS AND METHODS: We retrospectively reviewed 1166 adult patients who underwent TURP under general anesthesia between January 2020 and December 2024. RRD was assessed using the 3-minute Diagnostic Interview for CAM-defined Delirium (3D-CAM). Patients were randomly assigned to the training set (n = 816) and the validation set (n = 350). Independent risk factors were identified by multivariate logistic regression, and a nomogram was constructed. Model performance was evaluated by the area under the receiver operating characteristic curve (AUC), calibration curve, and decision curve analysis (DCA). RESULTS: The incidence of RRD was 19.5% in the training set and 20% in the validation set.