Daily Anesthesiology Research Analysis
Analyzed 52 papers and selected 3 impactful papers.
Summary
Three perioperative/critical care studies stand out today: a randomized, double-blind trial shows intraoperative dexmedetomidine markedly reduces first-night postoperative sleep disturbance in older adults. A prespecified physiologic substudy of an RCT after out-of-hospital cardiac arrest links higher MAP targets to increased pulmonary pressures but transiently lower calculated PVR with greater RV cardiac power. A systematic review/meta-analysis finds no clear outcome difference between volume-controlled mechanical ventilation and manual ventilation during CPR, with overall low-certainty evidence.
Research Themes
- Perioperative sedation and postoperative sleep quality
- Hemodynamic targets and right ventricular physiology after cardiac arrest
- Ventilation strategies during cardiopulmonary resuscitation
Selected Articles
1. Intraoperative dexmedetomidine reduces postoperative sleep disturbance in older adults undergoing major abdominal surgery: a single-center, randomized, double-blind, placebo-controlled trial.
In a randomized, double-blind, placebo-controlled trial of 210 older adults, intraoperative dexmedetomidine (0.3 or 0.6 μg/kg/h) reduced first-night postoperative sleep disturbance by 70–80% versus saline. Benefits extended to night 2 sleep and early recovery quality, without increases in hypotension, bradycardia, delirium, or 30-day mortality.
Impact: This high-quality RCT provides actionable evidence that a commonly used α2-agonist sedative can meaningfully improve early postoperative sleep quality in older adults, a modifiable factor linked to recovery.
Clinical Implications: Consider low-dose intraoperative dexmedetomidine infusion to reduce early postoperative sleep disturbance (PSD) in older adults after major abdominal surgery, while monitoring for standard hemodynamic effects. Multicenter validation and evaluation of longer-term cognitive outcomes are warranted.
Key Findings
- Both 0.3 and 0.6 μg/kg/h dexmedetomidine reduced first-night PSD versus saline (relative risk 0.31 and 0.18; NNT ≈2).
- Dexmedetomidine improved night-2 sleep metrics and QoR-15 scores on POD1.
- No significant differences in hypotension, bradycardia, delirium, or 30-day mortality across groups; actigraphy subset showed longer total sleep time.
Methodological Strengths
- Randomized, double-blind, placebo-controlled design with trial registration.
- Prespecified primary outcome (Athens Insomnia Scale) and objective actigraphy subset.
Limitations
- Single-center study may limit generalizability.
- Actigraphy assessed a subset (n≈20 per group) and long-term outcomes were limited to 30 days.
Future Directions: Multicenter pragmatic trials to confirm effectiveness, define optimal dosing, and assess downstream outcomes (delirium, cognition, readmissions) and cost-effectiveness.
BACKGROUND: Postoperative sleep disturbance (PSD) after major abdominal surgery in older adults is common and impairs recovery. Dexmedetomidine is a selective α METHODS: In this randomized, double-blind, placebo-controlled trial, 210 older adults undergoing major abdominal surgery were randomly assigned (1:1:1) to receive intraoperative normal saline, dexmedetomidine 0.3 μg/kg/h, or 0.6 μg/kg/h. The primary outcome was PSD on the first postoperative night (Athens Insomnia Scale score ≥ 6). Secondary outcomes included PSD on until nights 30; pain at 24 and 48 h; delirium and depressive symptoms within 7 days; and recovery quality on postoperative days 1‒3. Sleep patterns on nights 1 and 2 were assessed using wrist actigraphy. This trial was registered on the Chinese Clinical Trial Registry (Identifier: ChiCTR2300073163; principal investigator: Ke Peng; dated July 23, 2023; https://www.chictr.org.cn/showproj.html?proj=199410). RESULTS: 203 patients (median age 71 years; 67.5% male) completed this trial. Compared with normal saline (n = 67), both low-dose (n = 68) and high-dose dexmedetomidine (n = 68) significantly reduced first-night PSD (20.6% vs 65.7%; relative risk 0.31, 95% CI 0.19-0.50; NNT 2.2; P < 0.001; and 11.8% vs 65.7%; rel
2. Impact of Higher Versus Lower Blood Pressure Targets on Pulmonary Vascular Hemodynamics During Intensive Care After Out-of-Hospital Cardiac Arrest.
In this physiologic substudy of a randomized, double-blind trial in 730 OHCA survivors, targeting a higher MAP (77 mmHg) increased pulmonary artery pressures and cardiac output, yielding a transient reduction in calculated PVR compared with a lower MAP (63 mmHg). RV cardiac power output was lower with the lower MAP target; PCWP was initially lower in the low-MAP group.
Impact: The study provides granular invasive hemodynamic data linking MAP targets to pulmonary vascular load and RV performance after cardiac arrest, informing vasopressor titration where RV vulnerability is common.
Clinical Implications: When targeting MAP post-OHCA, clinicians should consider trade-offs between systemic perfusion and pulmonary vascular loading and monitor RV performance; higher MAP may transiently reduce calculated PVR via increased flow but raises pulmonary pressures.
Key Findings
- Higher MAP target increased mean pulmonary artery pressure by ~1.1–1.7 mmHg.
- Calculated PVR was transiently lower with the high-MAP target during the first 24 h, then converged.
- RV cardiac power output was consistently lower in the low-MAP group; PCWP was initially lower with low MAP.
Methodological Strengths
- Randomized, double-blind allocation of MAP targets within an RCT framework.
- Early and serial invasive hemodynamic measurements with PAC over 48 hours.
Limitations
- Physiologic substudy not powered for patient-centered outcomes; calculated PVR may be influenced by measurement assumptions.
- Potential confounding from ventilation and sedation strategies; generalizability beyond study centers uncertain.
Future Directions: Prospective trials linking MAP targets, RV phenotypes, and clinical outcomes; exploration of individualized MAP strategies guided by RV function and pulmonary hemodynamics.
BACKGROUND: Hemodynamic management after out-of-hospital cardiac arrest (OHCA) is critical, yet the impact of vasopressor-driven mean arterial pressure (MAP) targets on pulmonary circulation and right ventricular (RV) function remains unclear. METHODS: In this substudy of the randomized, double-blinded BOX trial, comatose OHCA survivors were allocated to low (63 mmHg) or high (77 mmHg) MAP targets. Pulmonary artery catheters (PAC) were used for serial hemodynamic assessment for 48 h after Intensive Care Unit admission. The primary endpoint was calculated pulmonary vascular resistance (PVR), secondary endpoints included pulmonary capillary wedge pressure (PCWP), pulmonary artery pulsatility index (PAPi), and RV cardiac power output (RV-CPO)-a measurement of RV pumping function. RESULTS: Among 730 included patients (median time randomization to PAC insertion 1.3 h), mPAP was consistently higher in the high-MAP group (mean difference 1.11-1.71 mmHg, 95% CI range 0.12-2.59). Calculated PVR was transiently lower in the high-MAP group during the first 24 h (mean difference -0.16 to -0.30, 95% CI range -0.31 to 0.11), before converging between
3. Volume-controlled mechanical ventilation during cardiopulmonary resuscitation: A systematic review and meta-analysis.
Across 13 studies (6 trials, 7 observational; n≈5,068), volume-controlled mechanical ventilation during CPR did not improve ROSC versus manual ventilation in two small RCTs (n=120). Evidence certainty was very low to low, and pediatric data were absent.
Impact: This synthesis clarifies that current evidence does not support superiority of volume-controlled ventilation during CPR, highlighting the need for rigorous trials and allowing clinicians to prioritize avoidance of hyperventilation and high-quality compressions.
Clinical Implications: In patients with advanced airways during CPR, choice between volume-controlled ventilation and manual ventilation can be guided by logistics and monitoring; focus on preventing hyperventilation, maintaining appropriate tidal volumes/rates, and minimizing interruptions.
Key Findings
- Two RCTs (n=120) found no difference in ROSC between volume-controlled and manual ventilation (OR 1.31; 95% CI 0.64–2.71).
- No pediatric data; comparisons with pressure-controlled or CPR-specific ventilation modes were limited and inconclusive.
- Overall risk of bias ranged from low to high (trials) and serious to critical (observational); GRADE certainty was very low to low.
Methodological Strengths
- Prospective registration (PROSPERO), comprehensive multi-database search, and standardized bias and certainty assessments (RoB2/ROBINS-I, GRADE).
- Meta-analytic synthesis where appropriate with explicit reporting of heterogeneity and limitations.
Limitations
- Sparse randomized evidence with small sample sizes; serious/critical bias in observational studies.
- No pediatric data and limited reporting of neurologically intact survival.
Future Directions: Adequately powered RCTs comparing ventilation modes during CPR with standardized targets (tidal volume, rate, EtCO2) and patient-centered outcomes (survival with good neurological function), including pediatric cohorts.
OBJECTIVE: To assess the evidence on volume-controlled mechanical ventilation versus manual ventilation or other ventilation modes during cardiopulmonary resuscitation (CPR). METHODS: On 18 March 2026, we searched PubMed, Embase, and Web of Science (PROSPERO: CRD420251110999). Randomized trials and non-randomized studies in children or adults with cardiac arrest and an advanced airway were included. Risk of bias was assessed using RoB2 and ROBINS-I tools. Meta-analyses were performed when appropriate, and certainty of evidence was assessed using GRADE. RESULTS: We screened 12,004 abstracts and included 13 articles consisting of six trials enrolling 461 patients and seven non-randomized studies including 4,607 patients. No study reported data on children. Meta-analysis of 120 patients from two randomized trials comparing volume-controlled to manual ventilation showed no difference for return of spontaneous circulation (ROSC) (odds ratio (OR), 1.31; 95%-confidence interval (CI), 0.64 to 2.71). Comparisons to pressure-controlled and CPR-specific modes were limited to a single trial each, with uncertain results. Randomized trials were at low to high risk of bias. Non-randomized studies were at serious or critical risk of bias. The certainty of evidence was very low to low across comparisons. CONCLUSION: Very low to low certainty evidence from randomized trials suggests no significant difference in clinical outcomes between volume-controlled mechanical ventilation and manual ventilation. The relative effectiveness of volume-controlled ventilation compared to other mechanical ventilation modes is uncertain.