Daily Anesthesiology Research Analysis
Three studies shape perioperative anesthesia practice today: an RCT-only meta-analysis finds that Hypotension Prediction Index–guided management reduces intraoperative hypotension metrics but not patient-centered outcomes; a blinded non-inferiority RCT shows opioid-free anesthesia is as effective as standard regimens in low-risk laparoscopic surgery while reducing rescue opioid use; and a prospective obstetric study links poor preoperative sleep quality to worse postpartum recovery and higher de
Summary
Three studies shape perioperative anesthesia practice today: an RCT-only meta-analysis finds that Hypotension Prediction Index–guided management reduces intraoperative hypotension metrics but not patient-centered outcomes; a blinded non-inferiority RCT shows opioid-free anesthesia is as effective as standard regimens in low-risk laparoscopic surgery while reducing rescue opioid use; and a prospective obstetric study links poor preoperative sleep quality to worse postpartum recovery and higher depressive symptoms.
Research Themes
- Predictive hemodynamic management and outcome translation gap
- Opioid-sparing anesthesia strategies in minimally invasive surgery
- Preoperative sleep quality and postpartum recovery in obstetric anesthesia
Selected Articles
1. Impact of Hypotension Prediction Index-Guided Management on Intraoperative Hypotension and Postoperative Outcomes in Abdominal Surgery: A Meta-Analysis of Randomized Controlled Trials.
Across eight RCTs (n=1534), HPI-guided care reduced intraoperative hypotension exposure (e.g., TWA MAP<65 mmHg, AUT) but did not improve AKI, complications, mortality, or LOS. These findings highlight a translation gap between physiologic optimization and patient-centered outcomes.
Impact: This RCT-only synthesis tempers expectations for AI-driven hypotension prediction by showing no improvement in patient-centered outcomes despite better blood pressure metrics.
Clinical Implications: Use HPI to reduce hypotension exposure if desired, but do not expect routine improvements in complications or AKI; prioritize multimodal strategies and consider trial-level biases before broad adoption.
Key Findings
- Included 8 RCTs with 1534 patients undergoing major abdominal surgery.
- No significant differences in AKI, postoperative complications, mortality, or hospital LOS with HPI guidance versus standard care.
- HPI guidance reduced IOH metrics: TWA MAP<65 mmHg (MD −20.5 minutes), AUT, and total time under MAP 65 mmHg.
- Risk of bias and lack of blinding limit confidence in patient-centered outcomes.
Methodological Strengths
- RCT限定のメタアナリシスで主要な患者志向アウトカムと詳細なIOH指標を評価
- 事前登録（PROSPERO）とランダム効果モデルによる頑健な統合解析
Limitations
- Lack of blinding in included trials and potential performance bias
- Clinical heterogeneity and uncertainty about generalizability beyond major abdominal surgery
Future Directions: Design adequately powered, blinded trials linking IOH reduction to hard outcomes, and test multimodal hemodynamic strategies beyond MAP thresholds.
BACKGROUND: The Hypotension Prediction Index (HPI) is a machine-learning algorithm designed to predict hypotension. by maintaining mean arterial pressure (MAP) above 65 mmHg. This meta-analysis evaluated whether HPI-guided management improves postoperative outcomes and included post hoc analyses of intraoperative hypotension (IOH) metrics in adults undergoing major abdominal surgery. METHODS: A comprehensive search of PubMed, EMBASE, and Cochrane databases identified randomized controlled trials comparing HPI-guided management with standard care. Primary outcomes were postoperative complications, acute kidney injury (AKI), perioperative mortality, and hospital length of stay (LOS). Post hoc analyses assessed IOH metrics, including time-weighted average (TWA) of MAP < 65 mmHg, area under the threshold (AUT), total time with MAP < 65 mmHg, and intraoperative fluid use. Meta-analyses were conducted using random-effects models to calculate pooled standardized mean differences (SMDs), odds ratios (ORs), and mean differences (MDs). RESULTS: Eight trials involving 1534 patients were included. No significant differences were observed for AKI (OR: 0.85; 95% CI: 0.64-1.13), postoperative complications (OR: 1.10; 95% CI: 0.83-1.46), mortality (OR: 0.96; 95% CI: 0.32-2.83), LOS (SMD: -0.15; 95% CI: -0.73 to 0.42), or fluid use (SMD: -0.06; 95% CI: -0.35 to 0.24). HPI reduced TWA MAP < 65 mmHg (SMD: -0.25; MD: -20.5 minutes), AUT (SMD: -0.83), and total time with MAP < 65 mmHg (SMD: -0.74). CONCLUSIONS: HPI-guided management did not significantly improve patient-centered outcomes. Post hoc analyses indicated a reduction in IOH metrics, but the clinical relevance of these findings remains uncertain given the lack of blinding and high risk of bias. REGISTRATION: PROSPERO: CRD42023490654.
2. Opioid-free versus opioid-based anaesthesia and analgesia for patients at low risk for acute postoperative pain undergoing laparoscopic surgery: A randomised controlled trial.
In 154 low-risk laparoscopic cases, opioid-free anesthesia was non-inferior to standard care for worst PACU pain and reduced PACU rescue opioid use. No differences were found in 24-hour pain, longer-term pain at 3–6 months, PONV, or recovery scores.
Impact: This trial supports opioid-sparing anesthesia as a viable strategy in selected elective laparoscopic patients, potentially reducing opioid exposure without compromising analgesia.
Clinical Implications: For low APOP-risk laparoscopic patients, consider OFA protocols to minimize perioperative opioid use while maintaining analgesic efficacy; anticipate similar PONV and recovery profiles.
Key Findings
- Patient- and assessor-blinded, single-center non-inferiority RCT with 154 ASA I–II patients undergoing laparoscopic surgery.
- Worst PACU pain was similar between OFA and standard care (4.8 vs 4.6; P=0.67).
- OFA reduced rescue opioid consumption in PACU (3.4 mg vs 5.1 mg; P=0.039).
- No significant differences in 24-hour pain, 3–6-month pain, PONV, or 24-hour recovery scores.
Methodological Strengths
- Patient- and assessor-blinded non-inferiority design with predefined inclusion based on APOP risk stratification
- Standardized multimodal OFA regimen and comprehensive short- and long-term pain assessments
Limitations
- Single-center study limiting generalizability
- Restricted to low APOP-risk patients; findings may not apply to higher-risk or open procedures
Future Directions: Multicenter trials in higher-risk populations and procedure types to define OFA’s role, safety (e.g., hemodynamics, sedation), and opioid-sparing benefits.
OBJECTIVE: To evaluate if opioid-free anaesthesia (OFA), is non-inferior to standard of care (SOC), in patients at low risk for acute postoperative pain (APOP). DESIGN: Patient- and assessor-blinded, non-inferiority, randomised, controlled trial. SETTING: Single centre between March 2022 to February 2024. PATIENTS: 154 adult patients, ASA I - II, planned for elective laparoscopic surgery and risk-classified as low risk for APOP based on perceived pain during venous cannulation (VAS < 2.0). INTERVENTION: Patients were randomised to receiving OFA, including sevoflurane, dexmedetomidine, esketamine and lidocaine, or standard of care (SOC), a traditional GABA MEASUREMENTS: Primary outcome: worst pain intensity in the PACU. SECONDARY OUTCOMES: worst pain, and proportion having NRS ≥ 4, at 24 h (during rest and movement), worst pain and proportion having NRS ≥ 1, at 3- and 6-months (during rest and movement), postoperative recovery at 24 h, PONV in the PACU and at 24 h. Rescue dose opioids in the PACU was an exploratory outcome. RESULTS: Pain scores were 4.8 in the OFA group and 4.6 in SOC group (P = 0.67). At 24 h, worst pain at rest was 5.7 vs 5.0 (P = 0.11), and during movement 5.6 vs 5.3 (P = 0.43). Proportion of patients with NRS ≥ 4 in the PACU was 66 % vs 69 % (P = 0.65) and at 24 h 76 % vs 60 % at rest (P = 0.042) and 73 % vs 69 % during movement (P = 0.65). There was no significant difference in PPOP at 3 or 6 months, either at rest (P = 0.51, P = 0.56) or movement (P = 0.72, P = 0.48), PONV (PACU: P = 0.93), at 24 h: (P = 0.52) or postoperative recovery at 24 h (99 vs 102, P = 0.44). OFA group required less rescue opioids in the PACU (3.4 mg vs 5.1 mg, P = 0.039). CONCLUSION: When individualising anaesthesia based on predicted risk for APOP, OFA is non-inferior to a traditional GABA
3. Prevalence of poor sleep quality before cesarean delivery and its association with postpartum quality of recovery and postpartum depressive symptoms: a prospective observational study.
Nearly half of women admitted for elective cesarean under spinal anesthesia had poor preoperative sleep quality, which was associated with worse early postpartum recovery and higher 1-month depressive symptoms. Associations persisted after adjustment including PSQI.
Impact: Identifies a modifiable preoperative factor linked to postpartum recovery and mental health, informing perioperative screening and nonpharmacologic interventions in obstetric anesthesia.
Clinical Implications: Incorporate brief sleep quality screening preoperatively for elective cesarean and consider targeted sleep optimization (education, sleep hygiene, environment) to potentially improve postpartum recovery and mood.
Key Findings
- Poor preoperative sleep quality (RCSQ<50) was present in 48.3% (95% CI 38.4–58.4%) of 93 women.
- Effect sizes linking poor sleep to worse ObsQoR-11 and higher EPDS ranged from 0.28 to 0.55.
- Adjusted analysis showed poorer ObsQoR-11 on postpartum day 1 with poor sleep (βadj −18.8; 95% CI −36.5 to −1.2).
- Associations were observed across early recovery days and at 1-month EPDS.
Methodological Strengths
- Prospective design with validated instruments (RCSQ, ObsQoR-11, EPDS) at multiple timepoints
- Multivariable adjustment including PSQI to address baseline sleep quality
Limitations
- Single-center, modest sample size limits generalizability
- Observational design susceptible to residual confounding and self-report bias
Future Directions: Randomized trials testing perioperative sleep optimization bundles and evaluating effects on recovery trajectories and mood after cesarean delivery.
PURPOSE: The primary objective of this study was to estimate the prevalence of sleep quality among patients hospitalized for cesarean delivery, with a secondary objective of assessing the impact of sleep quality on postpartum outcomes. METHODS: This prospective observational study included patients aged ≥18 years scheduled for elective cesarean delivery under spinal anesthesia admitted a day before delivery. The incidence of poor sleep quality (Richards-Campbell Sleep Questionnaire score <50) was estimated. Mean differences in obstetric quality-of-recovery-11 (ObsQoR-11) scores on postpartum days 1, 3, and 5 and the Edinburgh Postnatal Depression Scale (EPDS) score at 1 month after childbirth between those with and without poor sleep quality were evaluated using effect sizes. Multiple linear regression adjusted for relevant factors, including the Pittsburgh Sleep Quality Index, was used to evaluate the impact of poor sleep quality on the ObsQoR-11 score on only postpartum day 1. RESULTS: Of 93 included patients, 48.3% (38.4-58.4%) met the criteria for poor sleep quality. The effect sizes for poor preoperative sleep quality and the ObsQoR-11 and EPDS scores ranged from 0.28 to 0.55. Multiple regression analyses revealed an association of preoperative poor sleep quality with the ObsQor-11 score on postoperative day 1 [Adjusted beta (95% confidence interval): - 18.8 [(- 36.5, - 1.2)]. CONCLUSION: The prevalence of preoperative poor sleep quality in hospitalized pregnant women scheduled for elective cesarean delivery was 48%, which was significantly associated with quality of recovery on postpartum day 5 and EPDS scores at 1 month post-childbirth.