Daily Anesthesiology Research Analysis
Analyzed 12 papers and selected 3 impactful papers.
Summary
Today’s strongest anesthesiology evidence came from two randomized trials addressing postoperative recovery and nausea prevention, alongside a nationwide Japanese claims analysis of cardiac anesthesia practice. Glycopyrronium bromide was non-inferior to droperidol for postoperative nausea and vomiting, while dual-plane abdominal wall blockade reduced opioid use and accelerated recovery in older adults undergoing laparoscopic hernia repair.
Research Themes
- Postoperative nausea and vomiting prevention
- Opioid-sparing regional analgesia and enhanced recovery
- Population-level trends in cardiac anesthesia and transesophageal echocardiography
Selected Articles
1. Glycopyrronium Bromide versus Droperidol for Prophylaxis of Postoperative Nausea and Vomiting in Hysteroscopic Day Surgery: A Randomized, Double-Blind, Non-Inferiority Trial.
In 260 patients undergoing gynecological hysteroscopic day surgery, glycopyrronium bromide was non-inferior to droperidol for preventing postoperative nausea and vomiting within 24 hours. Bradycardia occurred less often with glycopyrronium bromide, whereas dry mouth was substantially more frequent.
Impact: This prospective, randomized, double-blind non-inferiority trial provides clinically relevant comparative evidence for an alternative antiemetic strategy in ambulatory gynecologic anesthesia. The findings are particularly useful where avoiding droperidol-associated bradycardia is desirable, although the increased dry-mouth burden must be considered.
Clinical Implications: Glycopyrronium bromide may be considered as an alternative to droperidol for PONV prophylaxis in hysteroscopic day surgery, particularly in patients at risk of bradycardia. Clinicians should counsel patients about dry mouth and evaluate whether its overall benefit fits the institution’s multimodal PONV protocol.
Key Findings
- Postoperative nausea and vomiting within 24 hours occurred in 37.1% of the glycopyrronium bromide group and 34.1% of the droperidol group; the prespecified 15% non-inferiority margin was met.
- Bradycardia was less frequent with glycopyrronium bromide than with droperidol (1.6% vs 7.3%, P=0.030).
- Dry mouth was more frequent with glycopyrronium bromide than with droperidol (67.7% vs 15.4%, P=0.001).
Methodological Strengths
- Prospective randomized double-blind non-inferiority design with a prespecified 15% margin.
- Standardized general anesthesia and clinically relevant perioperative safety outcomes.
Limitations
- The study was conducted in a specific gynecological hysteroscopic day-surgery population, limiting generalizability to other operations and higher-risk patients.
- The abstract does not report longer-term patient-centered outcomes or cost-effectiveness.
Future Directions: Larger multicenter trials should compare glycopyrronium bromide with contemporary multimodal antiemetic regimens, examine risk-stratified effects, and evaluate patient satisfaction, discharge readiness, and cost-effectiveness.
PURPOSE: To investigate the efficacy of glycopyrronium bromide in preventing postoperative nausea and vomiting (PONV) in patients undergoing gynecological hysteroscopic day surgery. PATIENTS AND METHODS: This study is a prospective, randomized, double-blind, non-inferiority trial. The non-inferiority margin was set at 15%. Patients scheduled for elective gynecological hysteroscopic day surgery under general anesthesia from November 2025 to February 2026 were selected. A total of 260 eligible patients were randomly assigned to receive glycopyrronium bromide (Group G) or droperidol (Group F). Patients in Group G received intravenous glycopyrronium bromide 0.2 mg, while those in Group F received intravenous droperidol 1 mg.
2. Postoperative Analgesia and Recovery with Liposomal Bupivacaine TAP/RSB Block in Elderly Patients Undergoing Laparoscopic Inguinal Hernia Repair: A Randomized Controlled Trial.
In a single-center three-arm randomized trial of 147 adults aged 70 years or older, both dual-plane blocks reduced 48-hour opioid consumption compared with no block. Liposomal bupivacaine additionally reduced early rescue analgesia and pain and was associated with earlier ambulation, extubation, and hospital discharge without an increase in adverse events.
Impact: The study directly addresses opioid minimization and functional recovery in an older surgical population, using patient-centered endpoints relevant to enhanced recovery after surgery. The three-arm comparison distinguishes the contribution of regional blockade from the potential added value of liposomal bupivacaine.
Clinical Implications: Dual-plane TAP plus rectus sheath block can be considered as part of an enhanced recovery pathway for older adults undergoing laparoscopic TAPP repair. Liposomal bupivacaine may provide additional early recovery benefits, but implementation should account for drug cost, local expertise, and confirmation in larger multicenter trials.
Key Findings
- Forty-eight-hour opioid consumption was lower than control with standard bupivacaine by 5.53 mg and with liposomal bupivacaine by 7.24 mg intravenous morphine equivalents.
- Early rescue analgesia was required by 2.0% of patients in the liposomal bupivacaine group versus 18.4% in the control group.
- Liposomal bupivacaine was associated with earlier ambulation, earlier extubation, and a shorter median hospital stay, with no significant difference in adverse events.
Methodological Strengths
- Randomized three-arm comparison included both standard bupivacaine and no-block controls.
- Outcomes included opioid consumption, pain, ambulation, extubation, length of stay, and adverse events.
Limitations
- The trial was single-center and included only 147 patients, limiting precision and external validity.
- Five outcome domains showed benefit, but the study design and abstract do not establish whether liposomal bupivacaine is cost-effective or superior over longer follow-up.
Future Directions: Multicenter pragmatic trials should confirm functional recovery benefits, assess cost-effectiveness, compare dosing and block techniques, and determine which older or frail subgroups derive the greatest benefit.
BACKGROUND: Older adults undergoing laparoscopic transabdominal preperitoneal (TAPP) hernia repair often experience inadequate analgesia and delayed mobilization. We tested the hypothesis that dual-plane abdominal wall blocks (transversus abdominis plane + rectus sheath block, TAP+RSB) using liposomal bupivacaine (LB) improve opioid-sparing and recovery versus standard bupivacaine (BP) or no block. METHODS: In this single-center, randomized, three-arm trial, 147 patients aged ≥70 years were assigned 1:1:1 to LB‑TAP+RSB (LB group, n=49), BP‑TAP+RSB (BP group, n=49), or no block (control, n=49). Anaesthesia was standardised to maintain BIS 40-60. The primary outcome was 48‑hour opioid consumption (intravenous morphine equivalents).
3. Nationwide trends in cardiac anesthesia requiring cardiopulmonary bypass and intraoperative transesophageal echocardiography use in Japan: a claims-based analysis, 2019-2023.
This nationwide claims-based study identified 179,920 cardiac anesthesia events in Japan from 2019 to 2023. Cardiac anesthesia volume remained stable after the COVID-19 disruption, while intraoperative transesophageal echocardiography use increased significantly, especially for percutaneous interventions, and regional disparities in cardiac anesthesia decreased.
Impact: The study offers rare national-scale evidence describing anesthesia service delivery and technology adoption across Japan. Its findings can inform workforce planning, regional resource allocation, and interpretation of the expanding role of intraoperative transesophageal echocardiography, while also illustrating the limitations of claims-based epidemiology.
Clinical Implications: The increasing use of intraoperative transesophageal echocardiography, particularly during percutaneous interventions, suggests a need for appropriate training, credentialing, equipment allocation, and standardized quality monitoring. Stable cardiac anesthesia volume with reduced regional inequality may support more targeted regional planning rather than simple nationwide expansion.
Key Findings
- A total of 179,920 cardiac anesthesia events were identified from 2019 to 2023, corresponding to 28.7 events per 100,000 person-years, with a male-to-female ratio of 1.6:1.
- Age-adjusted cardiac anesthesia rates showed no significant annual change, whereas ITEE use increased for cardiac/non-cardiac surgery (RR 1.011/year, P<0.0001) and percutaneous interventions (RR 1.117/year, P<0.0001).
- Regional disparities in cardiac anesthesia decreased, with the Gini coefficient declining from 0.20 to 0.15.
Methodological Strengths
- Nationwide longitudinal analysis using Japan’s National Database of Health Insurance Claims Open Data.
- Regression-based trend analysis combined with demographic and regional inequality measures.
Limitations
- Claims-based procedure categories may not capture clinical indications, procedural complexity, provider expertise, or actual quality of ITEE performance.
- The observational design cannot determine whether changes in ITEE use improved patient outcomes or reflect changes in coding practices.
Future Directions: Future studies should link claims with clinical registries and institutional data to evaluate patient outcomes, appropriateness of ITEE use, workforce needs, and the effects of regional redistribution of cardiac anesthesia services.
PURPOSE: This study characterized nationwide trends, demographic distributions, and regional disparities in cardiac anesthesia and intraoperative transesophageal echocardiography (ITEE) in Japan. METHODS: We conducted a retrospective observational study using the National Database of Health Insurance Claims (NDB) Open Data Japan (2019-2023). Cardiac anesthesia was defined using reimbursement codes for cardiac or thoracic great-vessel surgery requiring cardiopulmonary bypass. ITEE was evaluated using add-on claims classified into two categories: ITEE for cardiac/non-cardiac surgeries, and ITEE for percutaneous interventions. Trends were assessed using linear and Poisson regression models.