Daily Anesthesiology Research Analysis
Analyzed 92 papers and selected 3 impactful papers.
Summary
Three impactful studies span perioperative cognition and pain management. A large JAMA RCT shows clinician-supported biopsychosocial self-management modestly reduces disability in acute/subacute low back pain, while spinal manipulation alone offers no added benefit. In cardiac surgery with CPB, adding zero-balance ultrafiltration halves postoperative delirium risk; and a Bayesian network meta-analysis finds genicular nerve radiofrequency ablation most effective for chronic knee pain up to 12 months.
Research Themes
- Perioperative neurocognitive outcomes and delirium prevention
- Evidence-based chronic pain interventions and opioid-sparing strategies
- Biopsychosocial self-management in musculoskeletal pain
Selected Articles
1. Spinal Manipulation and Clinician-Supported Biopsychosocial Self-Management for Acute Back Pain: The PACBACK Randomized Clinical Trial.
In 1000 adults with acute/subacute low back pain at risk for chronicity, clinician-supported biopsychosocial self-management produced small but statistically significant reductions in disability over 12 months versus guideline-based medical care. Spinal manipulation alone did not significantly improve disability or pain, and pain intensity differences between groups were not significant.
Impact: This high-quality, multi-center RCT directly informs first-line management by demonstrating modest disability benefits for supported self-management and no added value of spinal manipulation alone.
Clinical Implications: Embed clinician-supported biopsychosocial self-management into routine care for acute/subacute LBP at risk of chronicity; reconsider spinal manipulation as a standalone strategy. Emphasize disability reduction rather than analgesia alone.
Key Findings
- Supported self-management reduced 12-month disability vs medical care (mean difference −1.2 [95% CI −1.9 to −0.5]).
- Combined supported self-management + spinal manipulation also reduced disability (−1.1 [95% CI −1.9 to −0.3]) while spinal manipulation alone did not (−0.4 [95% CI −1.2 to 0.4]).
- No significant between-group differences in pain intensity over 12 months (P = .16).
- Higher proportion achieving ≥50% disability reduction with supported self-management (67%) vs medical care (54%).
Methodological Strengths
- Large, multicenter 2×2 factorial randomized clinical trial (N=1000) with 93% retention and intention-to-treat analysis
- Registered trial (NCT03581123) with predefined co-primary outcomes and year-long follow-up
Limitations
- Effect sizes for disability were small and no significant pain benefits were observed
- Potential performance bias due to difficulty blinding behavioral interventions; details of provider variability not fully delineated
Future Directions: Identify patient subgroups most responsive to supported self-management; optimize implementation strategies and dosing (frequency/intensity) of clinician support; evaluate cost-effectiveness.
IMPORTANCE: Low back pain (LBP) is influenced by interrelated physical, psychological, and social factors. However, most treatments focus on symptom reduction without addressing the underlying biopsychosocial needs of patients. OBJECTIVE: To determine the effectiveness of spinal manipulation and clinician-supported biopsychosocial self-management vs medical care for adults with increased risk of chronic disabling LBP. DESIGN, SETTING, AND PARTICIPANTS: This 2 × 2 factorial randomized clinical trial enrolled participants in 3 research clinics at the Universities of Minnesota and Pittsburgh from November 2018 to May 2023; final follow-up was in June 2024. Adults with acute or subacute LBP at moderate to high risk of chronicity based on the STarT Back tool were randomized to 1 of 4 groups, with interventions lasting up to 8 weeks. Statistical analysis was conducted from November 2024 to June 2025. INTERVENTIONS: Spinal manipulation therapy (n = 201), supported self-management (n = 305), or combined supported self-management with spinal manipulation (n = 193) compared with guideline-based medical care (n = 301). Physical therapists and chiropractors provided spinal manipulation and supported self-management. MAIN OUTCOMES AND MEASURES: The 2 primary outcomes averaged over a follow-up of 1 year were monthly low back disability (Roland-Morris Disability Questionnaire) and weekly pain intensity (numerical rating scale). Secondary analysis examined the proportion of participants achieving a 50% or higher reduction in the primary outcome measures.
2. Zero-Balance Ultrafiltration Reduces Postoperative Delirium After Cardiac Surgery with Cardiopulmonary Bypass: A Randomized Controlled Trial.
Adding zero-balance ultrafiltration (post–cross-clamp plus conventional during rewarming) to standard ultrafiltration halved postoperative delirium after CPB (22.6% vs 50.9%; RR 0.45). Postoperative cognitive dysfunction at 1 and 3 months did not differ between groups.
Impact: Demonstrates a pragmatic perfusion strategy that significantly reduces POD—a common, morbid perioperative complication—without harming longer-term cognition.
Clinical Implications: Consider routine integration of zero-balance ultrafiltration in CPB protocols to prevent postoperative delirium, alongside standard delirium prevention bundles.
Key Findings
- Postoperative delirium within 7 days was significantly reduced with zero-balance ultrafiltration (22.6% vs 50.9%; RR 0.45, 95% CI 0.25–0.78).
- Protocol: zero-balance ultrafiltration after aortic cross-clamping plus conventional ultrafiltration during rewarming.
- No significant differences in postoperative cognitive dysfunction at 1 or 3 months.
Methodological Strengths
- Randomized controlled design with clearly defined primary and secondary outcomes
- Standardized CPB management across groups
Limitations
- Single trial with modest sample size; blinding not described, introducing potential assessment bias
- Generalizability may be limited to centers with perfusion expertise and similar protocols
Future Directions: Multicenter trials to confirm POD reduction, define optimal timing/dose of ultrafiltration, and evaluate interactions with other delirium prevention strategies.
PURPOSE: To assess the effects of conventional ultrafiltration and conventional plus zero-balanced ultrafiltration on delirium and cognition in patients undergoing cardiac surgery with cardiopulmonary bypass (CPB). METHODS: A total of 116 adults who were scheduled for cardiac surgery with CPB were randomly assigned to the conventional ultrafiltration group or the conventional plus zero-balanced ultrafiltration group. CPB was managed with standard protocols. In the conventional ultrafiltration group, ultrafiltration began during the rewarming phase and was performed until the CPB was terminated. In another group, perfusionists conducted zero-balance ultrafiltration after aortic cross-clamping and began conventional ultrafiltration during the rewarming phase. The primary outcome was the incidence of postoperative delirium (POD) within 7 days; the secondary outcome was postoperative cognitive dysfunction (POCD) at 1 and 3 months. In addition, the patients' vital signs and postoperative complications at different points during the operation were also recorded. RESULTS: During the first 7 postoperative days, POD was observed in 12 patients in the zero-balance ultrafiltration group and 27 patients in the conventional ultrafiltration group (12/53 [22.64%] vs 27/53 [50.94%]; RR 0.45, 95% CI 0.25 to 0.78; CONCLUSION: In patients who underwent cardiac surgery with CPB, zero-balance ultrafiltration significantly reduced the incidence of delirium compared with conventional ultrafiltration alone within the first 7 postoperative days. In contrast, the incidence of cognitive dysfunction did not differ significantly between the two groups at 1 or 3 months postoperatively.
3. Genicular Nerve Radiofrequency Ablation for the Treatment of Chronic Knee Pain: Systematic Review with Bayesian Network Meta-Analysis.
Across 29 studies (13 RCTs; 2,285 participants), genicular nerve radiofrequency ablation was consistently top-ranked versus sham, intra-articular injections, and chemical neurolysis for chronic knee pain at 1–12 months. Benefits were sustained up to 12 months and superior to sham through at least 6 months.
Impact: Provides a comparative effectiveness synthesis using Bayesian network meta-analysis, positioning GnRFA as a leading option for chronic knee pain management.
Clinical Implications: GnRFA can be prioritized for patients with OA-related or postsurgical persistent knee pain when conservative measures fail, potentially reducing systemic analgesic exposure.
Key Findings
- GnRFA was the highest ranked treatment at 1, 3, 6, and 12 months (86.3%, 75.3%, 74.3%, 75.0% likelihood, respectively).
- Effectiveness exceeded sham for at least 6 months.
- Evidence base included 13 RCTs and 16 observational studies totaling 2,285 participants.
Methodological Strengths
- Bayesian network meta-analysis integrates direct and indirect comparisons across multiple modalities
- Inclusion of both RCTs and observational data enhances generalizability
Limitations
- Heterogeneity across study designs, indications (OA vs PPSP), and protocols
- Risk of bias in observational studies; durability beyond 12 months less certain
Future Directions: Head-to-head RCTs comparing GnRFA parameters and long-term durability; standardized outcome measures and responder definitions; cost-effectiveness analyses.
OBJECTIVE: To evaluate the effectiveness of genicular nerve radiofrequency ablation (GnRFA) for chronic knee pain using a systematic review and Bayesian network meta-analysis (BNMA). RESULTS: The search identified 1,740 records, with 358 full texts reviewed and 29 studies included (13 randomized controlled trials and 16 observational studies, totaling 2,285 participants) GnRFA was most likely to be the highest ranked treatment for chronic knee treatment at 1 month (86.3%), 3 month (75.3%), 6 month (74.3%), and 12 months (75.0%) when compared to sham, intra-articular joint injections, and chemical neurolysis. CONCLUSIONS: GnRFA serves as an effective treatment for chronic knee pain from either OA or PPSP for at least 12 months. Additionally, it was found to be more effective than sham for at least 6 months.