Daily Anesthesiology Research Analysis
Analyzed 130 papers and selected 3 impactful papers.
Summary
Analyzed 130 papers and selected 3 impactful articles.
Selected Articles
1. Continuous vs Intermittent Postoperative Vital Sign Monitoring: A Cluster Randomized Crossover Trial.
In two surgical wards, unblinded continuous vital sign monitoring reduced cumulative time with oxygen saturation below 90% by about 30 minutes over 48 hours compared with intermittent monitoring, without significant effects on hypotension or tachycardia durations. Intervention rates were similar between groups. Findings support continuous monitoring as a strategy to lessen hypoxemia burden and motivate trials powered for patient-centered outcomes.
Impact: Provides randomized ward-level evidence that continuous monitoring shortens clinically relevant desaturation time, a modifiable perioperative risk factor. The pragmatic cluster crossover design enhances external validity for hospital implementation.
Clinical Implications: Hospitals adopting continuous ward monitoring with actionable alerts may reduce postoperative hypoxemia burden; integration into Enhanced Recovery pathways and escalation protocols should be evaluated, while outcomes beyond physiologic time-in-abnormality require confirmation.
Key Findings
- Continuous monitoring reduced cumulative time with SpO2 <90% by ~30 minutes over 48 hours (geometric means ratio 0.86; 95% CI 0.78-0.95; P=0.002).
- No significant reduction in durations of hypotension or tachycardia with continuous monitoring.
- Similar intervention rates across groups; approximately half required new oxygen therapy in both arms.
Methodological Strengths
- Multiple-crossover cluster randomized design with ward-level alternation of monitoring visibility.
- Predefined alert thresholds and ClinicalTrials.gov registration (NCT04574908) with prespecified outcomes.
Limitations
- Single health system and two wards may limit generalizability.
- Unblinded exposure and lack of power for hard patient-centric outcomes (e.g., ICU transfer, mortality).
Future Directions: Conduct multicenter trials powered for clinical endpoints (ICU transfers, rescue activations, mortality), evaluate cost-effectiveness, alarm fatigue mitigation, and integration with rapid response systems.
IMPORTANCE: Continuous postoperative monitoring on general nursing units detects vital sign abnormalities that are missed with conventional intermittent monitoring. Early recognition may prompt interventions to limit potentially harmful blood pressure, heart rate, and oxygen saturation perturbations. OBJECTIVE: To test the hypothesis that continuous unblinded monitoring of vital signs would decrease blood pressure, heart rate, and oxygen saturation abnormalities compared with intermittent monitoring in patients recovering from noncardiac surgery. DESIGN, SETTING, AND PARTICIPANTS: This multiple crossover randomized cluster trial in 2 postoperative hospital wards included patients recovering from noncardiac surgery and was conducted from October 7, 2020, to October 7, 2021. Data were analyzed from January to July in 2025. INTERVENTION: One participating ward was randomized to an initial month of either unblinded or clinician-blinded continuous vital sign monitoring and thereafter alternated at 4-week intervals for 1 year; the other ward always used the alternate monitoring approach. All patients had intermittent vital signs always available, whereas continuous vital signs were only available to clinicians during unblinded weeks. When continuous vital signs were unblinded, alerts at a mean arterial pressure less than 65 mm Hg, an oxygen saturation less than 90%, and a heart rate more than 110 per minute were transmitted to treating teams. MAIN OUTCOMES AND MEASURES: The primary outcomes were durations of hypotension, hypoxemia, and tachycardia exceeding alert thresholds during the initial 48 hours of ward admission or until the third postoperative morning. Secondary outcomes were interventions categorized, with increasing severity, as none, independent nursing intervention, physician notification, or activation of the hospital emergency or rapid response systems. RESULTS: Among 798 total patients (median [IQR] age, 70.7 [62.5-78.7] years; 440 females [55%]), who included 404 assigned to continuous monitoring and 394 to intermittent monitoring, 561 (70%) with the American Society of Anesthesiologists' physical status III were included in the final analysis. The duration of oxygen saturation less than 90% was reduced by approximately 30 minutes over 48 hours of monitoring time, in continuously monitored patients (unblinded continuous monitoring group median [IQR], 70.8 [23.1-154.2] minutes vs blinded intermittent group median [IQR], 103.5 [29.5-249.7] minutes; geometric means ratio, 0.86 [95% CI, 0.78-0.95]; P = .002). Hypotension and tachycardia durations were not significantly reduced. The number of interventions was similar, with approximately half in each group receiving new oxygen therapy (unblinded continuous monitoring: 224 [55%] and blinded intermittent monitoring: 214 [54%]). CONCLUSIONS AND RELEVANCE: In this cluster randomized crossover trial of continuous compared with intermittent vital sign monitoring, continuous monitoring reduced the duration of desaturation in patients recovering from noncardiac surgery on general hospital wards. Reducing the duration of vital sign abnormalities may decrease the risk of more serious complications, and robust patient-centric outcomes trials seem warranted. TRIAL REGISTRATION: ClinicalTrials.gov Identifier: NCT04574908.
2. Comparison of the Effects of Glycopyrrolate and Atropine on Postoperative Delirium in Older Adult Patients Undergoing Laparoscopic Colorectal Surgery: A Randomized Controlled Trial.
In older adults undergoing laparoscopic colorectal surgery, glycopyrrolate with neostigmine was associated with a significantly lower incidence of postoperative delirium than atropine (11.7% vs 27.9%; RR 0.42). Glycopyrrolate also better preserved hemodynamic stability, while neuronal injury biomarkers did not differ between groups.
Impact: Addresses a common, morbid postoperative complication with a simple, immediately actionable anesthetic choice during neuromuscular reversal, demonstrating a clinically meaningful effect size.
Clinical Implications: When reversing neuromuscular blockade with neostigmine in older adults, preferentially using glycopyrrolate over atropine may reduce postoperative delirium and improve hemodynamic stability.
Key Findings
- Postoperative delirium incidence was lower with glycopyrrolate vs atropine (11.7% vs 27.9%; RR 0.42; 95% CI 0.19-0.94; p=0.045).
- Glycopyrrolate better maintained baseline heart rate and mean arterial pressure during reversal.
- No significant between-group differences in plasma neurofilament light chain, neuron-specific enolase, or Tau protein at measured time points.
Methodological Strengths
- Double-blind randomized controlled design in a defined older surgical population.
- Clinically relevant primary endpoint with effect estimate and confidence interval; trial registered.
Limitations
- Single-center study limits generalizability; delirium assessment timeframe not detailed in abstract.
- No long-term cognitive or functional outcomes reported.
Future Directions: Validate findings multicenter, compare against sugammadex-based strategies, and assess long-term cognitive outcomes and cost-effectiveness.
BACKGROUND: Postoperative delirium (POD) is a common complication that hinders recovery in older patients. This study aimed to compare the effects of glycopyrrolate and atropine, used to counteract the peripheral effects of neostigmine, on POD incidence in older patients undergoing laparoscopic colorectal surgery. METHODS: This single-centre, double-blind, randomized controlled trial recruited patients (aged 65-80 years) undergoing laparoscopic colorectal surgery. Patients were randomized to receive either glycopyrrolate (0.04 mg kg RESULTS: Among 121 patients, the glycopyrrolate group had a significantly lower incidence of POD compared with the atropine group (11.7% vs 27.9%; relative risk, 0.42; 95% confidence interval, 0.19-0.94; p = 0.045). Glycopyrrolate better maintained baseline heart rate and mean arterial pressure. No significant differences were observed in plasma levels of neurofilament light chain, neuron-specific enolase, and Tau protein between groups at different time points. CONCLUSION: The combination of glycopyrrolate and neostigmine was associated with a lower incidence of POD than atropine in older adults undergoing laparoscopic colorectal surgery. REGISTRATION: Chinese Clinical Trial Registry, ChiCTR2300072798.
3. Relationship of intraoperative hypotension with major adverse cardiovascular events and acute kidney injury after pancreaticoduodenectomy.
In 1,846 pancreaticoduodenectomy cases with continuous arterial pressure monitoring, lower intraoperative MAP was linked to higher AKI risk, while MACE exhibited a J-shaped relationship with a turning point near 65 mmHg. The absolute maximum MAP decrease (AMD) consistently associated with both MACE and AKI across thresholds, suggesting prevention of large MAP drops and maintaining MAP ≥65 mmHg for cardiac protection and ≥60 mmHg for renal protection.
Impact: Defines data-driven MAP thresholds and the most informative hypotension metric (AMD) in a large single-procedure cohort, directly informing anesthetic hemodynamic targets for organ protection.
Clinical Implications: During pancreaticoduodenectomy, avoid large MAP drops and target MAP ≥65 mmHg to mitigate MACE risk and ≥60 mmHg to reduce AKI, with attention to absolute maximum decrease as a quality metric.
Key Findings
- AKI risk increased progressively with lower intraoperative MAP; MACE followed a J-shaped curve with a turning point around MAP 65 mmHg.
- Absolute maximum decrease (AMD) in MAP was the only metric associated with both MACE and AKI across all tested thresholds.
- At MAP <65 mmHg, AMD, AUT, and TWA associated with MACE; at MAP <60 mmHg, AMD, TIME, AUT, and TWA associated with AKI.
Methodological Strengths
- Large single-procedure cohort with continuous invasive blood pressure monitoring.
- Use of restricted cubic splines and multiple exposure metrics to characterize hypotension.
Limitations
- Retrospective single-procedure study with potential residual confounding and limited generalizability.
- Lack of detailed intraoperative management variables (e.g., anesthetic depth, vasopressor protocols) in abstract.
Future Directions: Prospective studies to test MAP targets and hypotension metrics (AMD) in interventional hemodynamic protocols, and external validation across surgeries and institutions.
BACKGROUND: Intraoperative hypotension (IOH) is a common concern during major surgery and is associated with end-organ injury. However, its specific impact on major adverse cardiovascular events (MACE) and acute kidney injury (AKI) following pancreaticoduodenectomy (PD) has not been well elucidated. METHODS: A retrospective cohort study was conducted, including 1846 patients who underwent PD between January 2018 and December 2023. Intraoperative mean arterial pressure (MAP) was recorded continuously via radial arterial catheterization. Restricted cubic spline models (RCS) were used to assess the associations of IOH with MACE and AKI. IOH was quantified using four exposure metrics: absolute maximum decrease (AMD), time under threshold (TIME), area under the threshold (AUT), and time-weighted average (TWA) to further analyse the association of MACE and AKI risk at the stratified threshold of MAP <60, 65, 70 mmHg. RESULTS: Among 1,846 patients enrolled, 211 (11.4%) developed MACE and 52 (2.8%) developed postoperative AKI. Multivariable-adjusted RCS analysis revealed that AKI occurrence increased progressively with decreasing MAP, whereas MACE followed a J-shaped curve with the turn-point of MAP around 65 mmHg. Forest plot analysis found that AMD was the sole metric that maintained a statistically significant association with both MACE and AKI across all tested MAP thresholds (<70, 65, 60 mmHg). Regarding specific thresholds, AMD, AUT, and TWA were significantly associated with MACE at MAP <65 mmHg, whereas AMD, TIME, AUT, and TWA all demonstrated statistical significance for AKI at MAP <60 mmHg. CONCLUSION: IOH is associated with MACE and AKI following PD. The higher MAP threshold for MACE (<65 mmHg) than for AKI (<60 mmHg) suggests the need for stricter hemodynamic goals to protect organs with differing ischemic thresholds.