Daily Anesthesiology Research Analysis
Analyzed 91 papers and selected 3 impactful papers.
Summary
Analyzed 91 papers and selected 3 impactful articles.
Selected Articles
1. Effect of preoperative warming combined with dexmedetomidine on postoperative delirium in elderly patients undergoing hip fracture surgery: a randomized controlled trial.
In a single-blind randomized trial of 153 analyzed patients undergoing hip fracture surgery, preoperative warming plus dexmedetomidine reduced postoperative delirium incidence to 14% versus 26% with warming alone and 49.1% with usual care, and shortened delirium duration. The protocol also monitored cognition and inflammatory biomarkers, supporting a biologically plausible benefit.
Impact: This pragmatic, easily implementable bundle markedly reduced delirium after a high-risk surgery, addressing a major driver of morbidity and costs in geriatric perioperative care.
Clinical Implications: Consider incorporating active prewarming and low-dose dexmedetomidine into hip fracture pathways to prevent delirium, with attention to hemodynamics and bradycardia monitoring.
Key Findings
- Postoperative delirium incidence: 14% with warming+dexmedetomidine vs 26% with warming alone vs 49.1% with control.
- Delirium duration was shorter in the warming+dexmedetomidine group versus comparator groups.
- Cognitive assessments (MoCA) and inflammatory biomarkers were included to explore mechanistic underpinnings.
Methodological Strengths
- Randomized, three-arm design with blinded delirium assessments (3D-CAM).
- Clinically relevant endpoints and inclusion of mechanistic biomarker panels.
Limitations
- Single-center, single-blind design limits generalizability and introduces potential performance bias.
- Follow-up limited to postoperative day 3 for delirium; long-term cognitive outcomes not reported.
Future Directions: Multicenter, double-blind trials to confirm efficacy, dose-optimization of dexmedetomidine, and evaluation of long-term cognitive and functional outcomes.
BACKGROUND: We evaluated whether preoperative warming combined with dexmedetomidine reduces postoperative delirium (POD) in older patients undergoing hip fracture surgery. METHODS: This single-blind randomized trial (March-November 2021) enrolled 197 patients aged ≥50 years scheduled for hip fracture surgery. Participants were randomized to warming plus dexmedetomidine (WD), warming alone (W), or control (C). The primary outcome of this manuscript was POD incidence, assessed twice daily from postoperative day (POD) 1 to 3 using the 3D-CAM. Secondary outcomes included delirium days, intraoperative temperature, pain scores (days 1-3), MoCA (days 1 and 3), serum S100β, IL-6, TNF- α, cortisol, and perioperative adverse events. RESULTS: Of the 174 randomized patients, 153 completed the study and were included in the final analysis. Postoperative delirium occurred in 49.1% of patients in the control group, 26% in the warming group, and 14% in the warming combined with dexmedetomidine group ( CONCLUSIONS: Preoperative warming combined with dexmedetomidine was associated with a lower incidence and shorter duration of POD in older patients undergoing hip fracture surgery. CLINICAL TRIAL REGISTRATION: Chinese Clinical Trial Registry (ChiCTR2100042142) http://www.chictr.org.cn/showproj.aspx?proj=62146.
2. Laryngeal mask airway versus endotracheal tube for preventing postoperative atelectasis after laparoscopic surgery: a randomized controlled trial.
In an assessor-blinded randomized trial of 186 completed patients, laryngeal mask airway use led to lower postoperative lung ultrasound (LUS) scores (less atelectasis) than endotracheal intubation after laparoscopic surgery and fewer pulmonary complications. Worsening intraoperative lung compliance signaled higher risk of postoperative aeration impairment.
Impact: This trial links airway choice to postoperative lung aeration using objective lung ultrasound, informing lung-protective anesthesia strategies during laparoscopy.
Clinical Implications: For eligible laparoscopic cases, consider LMA to reduce postoperative atelectasis and pulmonary complications, with careful patient selection and vigilance for aspiration risk.
Key Findings
- Postoperative LUS scores were significantly lower with LMA than ETT (e.g., 5.6 ± 2.4 vs 8.1 ± 1.9), indicating less atelectasis.
- Pulmonary complications were reduced in the LMA group versus ETT.
- Intraoperative declines in lung compliance predicted postoperative loss of aeration on lung ultrasound.
Methodological Strengths
- Assessor-blinded randomized controlled design with standardized lung ultrasound outcome.
- Heterogeneous laparoscopic procedures increase external relevance to routine practice.
Limitations
- Single-center study; generalizability to high aspiration risk or prolonged procedures is uncertain.
- Details on long-term respiratory outcomes and recovery metrics were limited.
Future Directions: Multicenter trials stratifying aspiration risk and procedure type/duration, with cost-effectiveness and patient-centered outcomes.
BACKGROUND: Postoperative atelectasis is a common and clinically significant complication of general anesthesia, particularly during laparoscopic surgery due to reduced lung compliance and diaphragmatic elevation. In this study, the effects of a laryngeal mask airway (LMA) and endotracheal tube (ETT) on postoperative atelectasis after laparoscopic surgery were compared, and a predictive model for lung injury was developed. We hypothesized that the use of a laryngeal mask airway would be associated with reduced postoperative atelectasis compared with endotracheal intubation in patients undergoing laparoscopic surgery. METHODS: In this single-center, assessor-blinded randomized controlled trial (ChiCTR2400094097), 192 adults (American Society of Anesthesiologists physical status I-III) undergoing elective laparoscopy (gastrointestinal, biliary, hernia, or gynecologic procedures) were randomized to LMA ( RESULTS: In total, 186 patients completed follow-up. The ETT group showed significantly higher postoperative LUS scores compared with the LMA group (8.1 ± 1.9 vs. 5.6 ± 2.4, CONCLUSIONS: In laparoscopic surgery, laryngeal mask airway use is associated with reduced postoperative atelectasis and pulmonary complications compared with endotracheal intubation. Intraoperative deterioration in lung compliance may serve as an early indicator of postoperative lung aeration impairment detected by lung ultrasound. CLINICAL TRIAL REGISTRATION: https://www.chictr.org.cn/showproj.html?proj=254374, Registration number: ChiCTR2400094097.
3. Hemodynamic stability with remimazolam versus propofol during anesthesia induction in hypertensive patients: a meta-analysis with trial sequential analysis of randomized controlled trials.
Across six RCTs, remimazolam reduced hypotension (RR 0.711) and bradycardia (RR 0.256) versus propofol during induction in hypertensive adults and maintained higher minimum MAP and HR. However, substantial heterogeneity and failure to reach required information size in trial sequential analysis limit certainty.
Impact: This synthesis addresses a common and clinically important induction dilemma in hypertensive patients, informing drug selection to mitigate hypotension and bradycardia.
Clinical Implications: Remimazolam may be preferred over propofol for induction in hypertensive patients at high risk of hypotension or bradycardia, pending confirmation by larger, well-powered trials.
Key Findings
- Lower risk of hypotension with remimazolam vs propofol (RR 0.711; 95% CI 0.545–0.929).
- Lower risk of bradycardia with remimazolam (RR 0.256; 95% CI 0.101–0.649).
- Higher minimum MAP (MD +9.0 mmHg) and HR (MD +7.2 bpm) with remimazolam; however, continuous outcomes showed high heterogeneity and TSA did not reach required information size.
Methodological Strengths
- Meta-analysis restricted to randomized controlled trials with predefined outcomes.
- Use of trial sequential analysis to assess random errors and information size.
Limitations
- Substantial heterogeneity in continuous outcomes; small total sample size across trials.
- TSA did not achieve required information size, limiting conclusiveness.
Future Directions: Large, multicenter head-to-head RCTs in hypertensive and other high-risk populations with standardized dosing and hemodynamic protocols.
BACKGROUND: Hypertensive patients tend to have an increased risk of hypotension during anesthesia induction, which can result in adverse outcomes. This study aimed to compare hemodynamic stability with remimazolam versus propofol in hypertensive patients. METHODS: This meta-analysis analyzed randomized controlled trials investigating the hemodynamic parameters of remimazolam versus propofol during anesthesia induction in hypertensive adults. A systematic search of electronic databases was conducted in November 2024. RESULTS: Six studies were included in the final analysis. The administration of remimazolam significantly lowered the risk of hypotension (risk ratio [RR] 0.711; 95% CI 0.545 to 0.929; I2 = 67.54%) and bradycardia (RR 0.256; 95% CI 0.101 to 0.649; I2 = 0.0%). It also resulted in a higher minimum mean arterial pressure (mean difference [MD] 9.023 mmHg; 95% CI 0.243 to 17.802; I² = 97.50%) and higher minimum heart rate (MD 7.200 beats/min; 95% CI 1.960 to 12.441; I² = 86.40%). Despite these findings, substantial heterogeneity was observed in continuous outcomes. The trial sequential analysis revealed that none of the outcomes reached the required information size. CONCLUSIONS: The administration of remimazolam showed a trend toward superior hemodynamic stability compared with propofol during anesthesia induction in hypertensive patients, especially in minimizing the incidence of hypotension and bradycardia. However, the trial sequential analysis results remain inconclusive, the current evidence is limited by small sample sizes, and larger trials are needed to confirm our findings.