Daily Anesthesiology Research Analysis
Analyzed 63 papers and selected 3 impactful papers.
Summary
Three impactful anesthesiology papers stood out today: a meta-analysis shows video laryngoscopy and noninvasive respiratory support improve first-attempt neonatal/infant intubation success; a cohort study links higher vasopressor dose to impaired microcirculatory oxygenation using hyperspectral imaging; and a network meta-analysis refines strategies to prevent intraoperative hypothermia, favoring underbody forced-air warming with prewarming/fluid warming in high-risk cases.
Research Themes
- Airway management and neonatal intubation
- Microcirculation monitoring and vasopressor effects
- Perioperative thermoregulation and hypothermia prevention
Selected Articles
1. Interventions to improve neonatal and infant intubation success: a meta-analysis.
Across randomized trials, video laryngoscopy improved first-attempt neonatal/infant intubation success versus direct laryngoscopy (RR 1.13). Noninvasive respiratory support during intubation also improved success (RR 1.18), and pharmacologic premedication (including neuromuscular blockade) enhanced intubation conditions without prolonging time. Desaturation outcomes were similar across interventions.
Impact: Provides high-certainty, practice-informing evidence that supports routine use of video laryngoscopy and respiratory support strategies in neonatal/infant intubation, areas with high complication risk.
Clinical Implications: Consider video laryngoscopy as first-line for neonatal/infant intubation and maintain noninvasive respiratory support during attempts; employ structured pharmacologic premedication including neuromuscular blockade when appropriate to increase first-attempt success.
Key Findings
- Video laryngoscopy improved first-attempt success vs direct laryngoscopy (RR 1.13; 95% CI 1.06-1.20; high-certainty).
- Noninvasive respiratory support during intubation improved first-attempt success (RR 1.18; 95% CI 1.02-1.38; moderate-certainty).
- Neuromuscular blockade shortened intubation duration; overall desaturation outcomes did not differ across interventions.
Methodological Strengths
- Randomized trials synthesized with random-effects models and GRADE certainty assessment.
- Broad inclusion across settings (NICU/OR) enhances generalizability.
Limitations
- Most intubations were elective; emergent settings less represented.
- Heterogeneity across devices, operator expertise, and premedication protocols.
Future Directions: Large pragmatic multicenter RCTs comparing standardized bundles (video laryngoscopy + premedication + respiratory support) versus usual care with patient-centered outcomes and safety endpoints.
UNLABELLED: The aim of this study is to synthesize and evaluate the effectiveness of interventions aimed at improving endotracheal intubation success in neonates and infants. PubMed, Scopus, and Web of Science were searched from inception through July 2025. Randomized studies involving neonatal or infant endotracheal intubation were included regardless of intervention or comparator. Two reviewers independently extracted data and assessed risk of bias. Data were pooled using a random-effects inverse-variance model. Results are reported as risk ratios (RRs) with 95% confidence interval
2. High vasopressor doses are associated with decreased tissue oxygenation in critically ill patients: a secondary analysis of a prospective cohort.
In 502 surgical ICU patients, higher norepinephrine-equivalent vasopressor dose independently correlated with lower hand tissue oxygenation (StO2) by HSI, whereas MAP did not. The highest vasopressor quartile had the lowest StO2 and highest 30-day mortality; StO2 partially mediated the relationship between vasopressor load and lactate and improved after shock reversal.
Impact: Introduces objective bedside microcirculatory monitoring (HSI) linked to vasopressor dosing, highlighting a potential blind spot when targeting only macrocirculatory metrics.
Clinical Implications: Consider integrating microcirculatory assessments (e.g., HSI-derived StO2) when escalating vasopressors; patients requiring high vasopressor doses may benefit from strategies targeting microcirculatory perfusion beyond MAP goals.
Key Findings
- Higher norepinephrine-equivalent dose independently associated with lower StO2 (B=-0.0931; β=-0.193; p=0.001).
- MAP was not significantly correlated with StO2, indicating macro-micro circulatory dissociation.
- StO2 partially mediated the association between vasopressor load and lactate; improved after shock reversal (+5.8%, p<0.001).
Methodological Strengths
- Prospective cohort with objective HSI measurements at ICU admission.
- Multivariable regression and mediation analysis to address confounding and mechanistic pathways.
Limitations
- Secondary analysis from a single-center prospective cohort limits external generalizability.
- Observational design precludes causal inference; intervention thresholds for StO2 are undefined.
Future Directions: Randomized trials testing microcirculation-guided vasopressor strategies versus MAP-guided care with patient-centered outcomes; multi-site validation of HSI thresholds.
BACKGROUND: Despite stabilizing macrocirculatory blood pressure, vasopressors may deleteriously affect microcirculatory perfusion in critically ill patients. As microcirculatory dysfunction is associated with adverse outcomes and objective bedside monitoring remains limited, hyperspectral imaging (HSI) has emerged as a promising noninvasive method to assess tissue oxygenation. This study investigated the association between load of vasoactive medication and microcirculatory impairment using HSI in critically ill patients. METHODS: In this secondary analysis of the prospective HySpec-ICU study, 502 surgical ICU patients were included. HSI measurements of the hand were performed on the day of admission to determine tissue oxygenation (StO₂) and other HSI variables. Multivariable linear regression and mediation analysis were employed to investigate the association between Norepinephrine Equivalent (NEE) and StO₂ and its impact on serum lactate levels. RESULTS: Higher NEE was independently associated with significantly lower StO₂ (B = - 0.0931, β=-0.193, p = 0.001), while MAP showed no significant correlation with StO₂. Patients in the highest NEE quartile (> 0.28) exhibited the lowest StO₂ and the highest 30-day mortality (41.8%). StO₂ partially mediated the relationship between vasopressor load and arterial lactate. StO₂ generally improved after shock reversal defined as NEE ≤ 0.05, lactate < 2mmol/l, MAP ≥ 65mmHg for at least 24 h (+ 5.8%, p < 0.001). CONCLUSION: High vasopressor requirements are associated with impaired microcirculatory oxygenation of the hand regardless of systemic blood pressure. HSI provides an objective bedside tool to monitor these alterations, potentially identifying patients with persistent microcirculatory shock who require intensified therapy beyond macrohemodynamic targets.
3. Effects of different warming strategies on intraoperative hypothermia: a systematic review and network meta-analysis of randomized controlled trials.
In 45 RCTs (n=5317), underbody forced-air warming (FAW) reduced intraoperative hypothermia compared with lower-body or surgical-access FAW blankets. Adding prewarming to FAW significantly reduced hypothermia risk (RR 0.66), and combining FAW with fluid warming showed additional numerical benefit, supporting multimodal thermoregulation in high-risk cases.
Impact: Updates perioperative thermoregulation by discriminating FAW blanket performance and demonstrating added value of prewarming/fluid warming, informing protocolized warming bundles.
Clinical Implications: Prefer underbody FAW when feasible; incorporate 20–30 minutes of prewarming and warm irrigation/IV fluids for older patients, long surgeries, or high hypothermia risk to reduce IH incidence.
Key Findings
- Underbody FAW had lower IH incidence than lower-body FAW (RR 1.54 vs underbody; 95% CI 1.17–2.04) and surgical-access FAW (RR 1.44; 95% CI 1.01–2.06).
- Prewarming plus FAW significantly reduced IH compared with FAW alone (RR 0.66; 95% CI 0.45–0.96).
- Combining FAW with fluid warming showed additional numerical reductions in IH, supporting multimodal warming in high-risk contexts.
Methodological Strengths
- Network meta-analysis of 45 RCTs with 5317 patients and PROSPERO registration.
- Comparative evaluation of FAW blanket configurations and multimodal strategies.
Limitations
- Wide prediction intervals for some comparisons; indirectness between nodes in NMA.
- Heterogeneity in surgical types and warming protocols may affect precision.
Future Directions: Head-to-head RCTs of underbody FAW versus other blankets with standardized prewarming/fluid warming bundles and core-temperature trajectories; cost-effectiveness analyses.
BACKGROUND: The purpose of this network meta-analysis was to assess the effect of different active warming strategies on intraoperative hypothermia (IH). METHODS: Databases of PubMed, Web of Science, Embase, and Cochrane Library were searched for randomized controlled trials that were published from 1 January 2015 to 20 September 2025. The incidence of IH was the primary outcome. RESULTS: A total of 45 studies comprising 5317 patients were included in this study. Among the single warming strategies, both thermal suit [RR = 0.45, 95% CI (0.16, 1.27)] and irrigation fluid warming [RR = 0.95, 95% CI (0.27, 3.30)] demonstrated a numerically lower incidence of IH compared with forced-air warming (FAW). For FAW blanket type, the incidence of IH in FAW-Lower-body [RR = 1.54, 95% CI (1.17, 2.04)] and FAW-Surgical-access blanket [RR = 1.44, 95% CI (1.01, 2.06)] was significantly higher than that in FAW-Underbody. Compared with FAW alone, multiple combined warming strategies without prewarming exhibited numerically reduced IH incidence, such as irrigation fluid warming + intravenous fluid warming + FAW [RR = 0.44, 95% CI (0.04, 4.40)]. Compared with FAW alone, prewarming + FAW showed significantly lower IH incidence [RR = 0.66, 95% CI (0.45, 0.96)]. CONCLUSION: FAW remains the pragmatic standard for preventing IH, with the underbody type preferred whenever clinically feasible. We conditionally recommend combining FAW with prewarming and fluid warming in high-risk contexts (particularly for older patients and prolonged surgery), although wide prediction intervals suggest these added benefits should be interpreted cautiously. TRIAL REGISTRATION: PROSPERO Registration Number: CRD420251148645.