Daily Anesthesiology Research Analysis
Analyzed 91 papers and selected 3 impactful papers.
Summary
Three perioperative studies inform immediate practice: a randomized trial shows laryngeal mask airway reduces postoperative atelectasis versus endotracheal intubation during laparoscopy; a randomized crossover analysis demonstrates intraoperative hyperoxia worsens myocardial strain in patients with coronary artery disease; and a three-arm randomized trial finds preoperative warming plus dexmedetomidine lowers postoperative delirium after hip fracture surgery.
Research Themes
- Perioperative lung protection and airway strategy
- Intraoperative oxygen titration and myocardial function
- Delirium prevention via thermoregulation and alpha-2 agonist sedation
Selected Articles
1. Laryngeal mask airway versus endotracheal tube for preventing postoperative atelectasis after laparoscopic surgery: a randomized controlled trial.
In an assessor-blinded randomized trial of adults undergoing elective laparoscopy, the laryngeal mask airway led to significantly lower postoperative lung ultrasound (LUS) atelectasis scores and fewer pulmonary complications than endotracheal intubation. Intraoperative declines in lung compliance predicted higher postoperative LUS scores.
Impact: Provides randomized evidence supporting LMA as an airway strategy to mitigate postoperative atelectasis during laparoscopy and links intraoperative mechanics to postoperative aeration.
Clinical Implications: Consider LMA over ETT for suitable laparoscopic cases to reduce postoperative atelectasis and pulmonary complications; monitor intraoperative lung compliance as an early warning for postoperative aeration impairment.
Key Findings
- Postoperative LUS atelectasis scores were significantly lower with LMA versus ETT (5.6 ± 2.4 vs 8.1 ± 1.9).
- Pulmonary complications were reduced in the LMA group compared with ETT.
- Intraoperative deterioration in lung compliance predicted higher postoperative LUS scores.
Methodological Strengths
- Assessor-blinded randomized controlled design with trial registration
- Objective outcome using lung ultrasound scoring
Limitations
- Single-center study limits generalizability
- Details on anesthesia and ventilation strategies across groups not fully reported in abstract
Future Directions: Multicenter RCTs comparing airway strategies across varied laparoscopic procedures with standardized ventilation protocols and longer-term pulmonary 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.
2. Effects of hyperoxia on systolic and diastolic function assessed by strain analysis in patients with coronary artery disease during general anaesthesia.
In a secondary analysis of a randomized crossover trial of 99 coronary artery disease patients under general anesthesia, hyperoxia worsened global circumferential systolic strain and affected diastolic strain markers compared with normoxemia. Heterogeneous individual responses suggest baseline normoxemic EF/GLS/GCS may guide personalized oxygen titration.
Impact: Provides mechanistic, intraoperative evidence linking hyperoxia to measurable myocardial strain deterioration in CAD, supporting judicious oxygen titration.
Clinical Implications: Avoid routine hyperoxia in CAD during anesthesia; titrate FiO2 to normoxemia, using baseline strain metrics to guide oxygen targets where available.
Key Findings
- Global circumferential systolic strain (GCS) deteriorated under hyperoxia versus normoxemia during general anesthesia.
- Circumferential strain-based diastolic markers indicated global and regional impairment with hyperoxia.
- Interindividual variability suggests baseline EF/GLS/GCS at normoxemia can inform personalized oxygen titration.
Methodological Strengths
- Randomized crossover exposure to normoxemia versus hyperoxia
- Advanced intraoperative TEE strain analysis with multiple systolic and diastolic metrics
Limitations
- Secondary analysis with no hard clinical outcomes reported
- Single-center population undergoing CABG limits generalizability
Future Directions: Prospective trials testing oxygen titration guided by intraoperative strain metrics on postoperative cardiac outcomes in CAD.
BACKGROUND: Cardiac complications are a source of perioperative morbidity, but the impact of perioperative supplemental oxygen -a coronary vasoconstrictor- on the myocardium remains unclear. OBJECTIVE: To determine the impact of supplemental oxygen on myocardial function in patients with coronary artery disease during general anaesthesia by 2D echocardiography. We hypothesised that 2D global systolic circumferential strain (GCS) worsens under hyperoxia. DESIGN: This is a secondary analysis of a prospective randomised cross-over trial. SETTING: Single tertiary centre. PATIENTS: Datasets from 99 patients undergoing elective coronary artery bypass surgery were analysed. INTERVENTION: During general anaesthesia, patients were exposed to normoxaemic and hyperoxic inspired oxygen fractions. MAIN OUTCOME MEASURES: Transoesophageal echocardiography cines were analysed in each state primarily for changes in 2D GCS. Secondarily systolic parameters such as 2D global systolic longitudinal strain (GLS), ejection fraction (EF) and diastolic parameters were analysed. RESULTS: GCS worsened under hyperoxia compared with normoxaemia (25.2% (26.6 to 23.8) vs. 26.1% (27.5 to 24.7), CONCLUSIONS: In patients with coronary artery disease, mean GCS deteriorated with hyperoxia under general anaesthesia. Furthermore, circumferential strain based diastolic markers delineated a global and regional effect of hyperoxia on myocardial function. In the light of heterogeneous changes in systolic function with hyperoxia in individual patients, EF, GLS and GCS at normoxaemia may guide the utility of hyperoxia in patients with coronary artery disease undergoing general anaesthesia and as such may help to titrate supplemental oxygen in the individual patient. TRIAL REGISTRATION: NCT04424433.
3. 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 three-arm randomized trial of hip fracture surgery, postoperative delirium occurred in 49.1% (control), 26% (warming), and 14% (warming plus dexmedetomidine). The combined strategy reduced both incidence and duration of delirium versus control.
Impact: Demonstrates a pragmatic, low-cost thermoregulation plus alpha-2 agonist approach that substantially reduces delirium after hip fracture surgery.
Clinical Implications: Implement preoperative active warming and consider low-dose dexmedetomidine sedation protocols in elderly hip fracture surgery to reduce delirium burden.
Key Findings
- Postoperative delirium incidence: control 49.1%, warming 26%, warming plus dexmedetomidine 14%.
- The combined intervention reduced both incidence and duration of delirium compared with control.
- Biomarker and temperature monitoring protocolized; assessments used validated 3D-CAM.
Methodological Strengths
- Randomized three-arm design with blinded assessments
- Use of validated delirium instrument (3D-CAM) and predefined biomarker panel
Limitations
- Single-center, single-blind design with follow-up limited to 3 postoperative days
- Dexmedetomidine dosing strategy details and sedation depth targets not fully detailed in abstract
Future Directions: Multicenter trials to optimize dexmedetomidine dosing, timing, and integration with non-pharmacologic delirium prevention bundles; assess longer-term cognitive 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.