Daily Anesthesiology Research Analysis
Analyzed 22 papers and selected 3 impactful papers.
Summary
Today’s highest-impact studies address neonatal airway management, sedation strategies for elderly stroke patients undergoing mechanical thrombectomy, and growth-based endotracheal tube selection in Japanese children. The strongest evidence comes from a prospective randomized neonatal trial, while large observational datasets provide clinically useful guidance for pediatric airway sizing and perioperative neuroanesthetic care.
Research Themes
- Neonatal airway device optimization
- Hemodynamically stable sedation and postoperative neurocognitive outcomes
- Growth-based pediatric endotracheal tube selection
Selected Articles
1. Comparison of remimazolam and dexmedetomidine on perioperative hemodynamics, postoperative mood, cognition, and delirium in elderly stroke patients undergoing mechanical thrombectomy: a single-center prospective cohort study.
Among 138 elderly patients with acute ischemic stroke undergoing mechanical thrombectomy, both remimazolam and dexmedetomidine reduced perioperative mean arterial pressure variability and hypotension compared with controls. Both agents were also associated with markedly lower risks of delirium and cognitive decline, along with improved postoperative mood and reduced analgesic requirements, although randomized confirmation is needed.
Impact: This study evaluates sedation in a particularly vulnerable population where blood pressure control and preservation of neurologic function are both critical. Its simultaneous assessment of hemodynamic and neuropsychological outcomes broadens the usual focus of procedural sedation studies.
Clinical Implications: Remimazolam and dexmedetomidine may be candidate sedation strategies for elderly patients undergoing mechanical thrombectomy, particularly when avoiding hypotension and postoperative delirium is important. Treatment selection should remain individualized because the observational design cannot exclude confounding by indication.
Key Findings
- Mean arterial pressure range was reduced with dexmedetomidine and remimazolam compared with controls, with regression coefficients of -9.74 and -12.49, respectively.
- Hypotension was less frequent with dexmedetomidine and remimazolam, with odds ratios of 0.33 and 0.22, respectively.
- Both agents were associated with substantially lower delirium risk and cognitive decline, with delirium odds ratios of 0.05 for dexmedetomidine and 0.03 for remimazolam.
Methodological Strengths
- Prospective cohort design in a clinically high-risk and clearly defined population.
- Integrated hemodynamic, delirium, cognition, mood, biomarker, pain, and vasoactive medication outcomes.
Limitations
- Nonrandomized single-center design limits causal inference and generalizability.
- Sedation exposure was used to define groups, creating potential confounding by treatment indication and clinician preference.
Future Directions: Multicenter randomized trials should compare remimazolam and dexmedetomidine using standardized anesthetic protocols and validated neurologic, cognitive, and delirium outcomes. Studies should also evaluate long-term functional recovery, cost, reversal strategies, and interactions with stroke reperfusion and blood pressure targets.
Optimal sedation strategies for elderly patients with acute ischemic stroke (AIS) undergoing mechanical thrombectomy (MT) remain uncertain, particularly regarding their combined effects on hemodynamic stability and early postoperative neuropsychological outcomes. To compare remimazolam (RM) and dexmedetomidine (DEX) in terms of perioperative hemodynamic stability and early postoperative mood, cognitive function, and delirium. In this single-center prospective cohort study, 138 elderly AIS patients undergoing MT under general anesthesia were categorized into control (C, n = 45), DEX (n = 45), and RM (n = 48) groups based on sedation exposure. The primary outcome was MAP_range across T0-T6.
2. Comparative Evaluation of the Efficacy of C-MAC™, McGrath MAC™ Videolaryngoscopes, and the Direct Miller Laryngoscope for Neonatal Intubation under General Anesthesia.
In this prospective randomized trial of 90 neonates, C-MAC videolaryngoscopy produced the shortest median total intubation time at 27 seconds, compared with 29 seconds for McGrath MAC and 29.5 seconds for Miller direct laryngoscopy. C-MAC also provided better Cormack-Lehane grades, higher percentage of glottic opening scores, and the highest first-attempt success rate of 93.3%.
Impact: This study directly compares two modern videolaryngoscopes with the conventional neonatal standard in a randomized design. The findings support a practical device-selection strategy for improving visualization and efficiency during a high-risk airway procedure.
Clinical Implications: C-MAC may be considered as a preferred videolaryngoscope for neonatal intubation when available, particularly when rapid glottic visualization and high first-attempt success are priorities. Local expertise, blade size, neonatal anatomy, and operator training should still guide device selection.
Key Findings
- Median total intubation time was 27 seconds with C-MAC, compared with 29 seconds with McGrath MAC and 29.5 seconds with Miller direct laryngoscopy.
- C-MAC provided better Cormack-Lehane grades and higher percentage of glottic opening scores.
- First-attempt success rates were 93.3% for C-MAC, 90.0% for McGrath MAC, and 86.7% for Miller direct laryngoscopy.
Methodological Strengths
- Prospective randomized three-group comparative design.
- Assessment included procedural time, glottic visualization, intubation ease, and first-attempt success.
Limitations
- The sample size was limited to 90 neonates.
- The abstract does not establish whether results generalize across different neonatal weights, airway abnormalities, or operator experience levels.
Future Directions: Larger multicenter randomized trials should evaluate clinically important outcomes such as severe desaturation, airway trauma, number of attempts, and performance in extremely preterm or anatomically difficult neonates. Cost-effectiveness and training requirements for C-MAC use also warrant study.
BACKGROUND: Neonatal endotracheal intubation remains technically challenging due to small airway dimensions and limited glottic visualization. Identifying the most effective device and technique to secure the airway is crucial. Video laryngoscopes (VLs) have been introduced to enhance visualization and improve intubation success. Considering the evolution of VL designs for pediatric use, this prospective, randomized trial compared two VLs with the conventional Miller Direct laryngoscopy (DL). MATERIALS AND METHODS: Ninety neonates were randomly allocated into three equal groups (n = 30 each): Group A (C-MAC VL), Group B (McGrath MAC VL), and Group C (Miller DL).
3. Selection of endotracheal tube size and insertion depth according to pediatric growth charts and physique in Japan.
This retrospective analysis of 6,460 Japanese children aged 0–15 years found very strong correlations between clinically selected endotracheal tube size or insertion depth and height- and weight-based growth charts. Correlation coefficients were generally 0.90 or higher, and mixed models accounting for growth and anesthesiologist clustering achieved R-squared values of 0.80 for tube size and 0.76 for insertion depth.
Impact: The study provides a large, real-world Japanese dataset for translating pediatric growth parameters into airway equipment selection. Its findings may improve preoperative planning and reduce reliance on age-only formulas, especially in children with atypical body size.
Clinical Implications: Height and weight growth charts can support selection of endotracheal tube size and insertion depth in Japanese children. Clinicians should use these relationships as planning tools while confirming tube position clinically and with appropriate monitoring, because individual anatomy and airway conditions remain decisive.
Key Findings
- In girls, correlations of uncuffed tube size with height and weight were 0.97 and 0.94, while correlations for insertion depth were 0.95 and 0.92.
- In boys, correlations of tube size with height and weight were 0.97 and 0.93, while correlations for insertion depth were 0.94 and 0.90.
- Growth-rate-adjusted mixed models yielded R-squared values of 0.80 for tube size and 0.76 for insertion depth.
Methodological Strengths
- Large clinical sample of 6,460 children spanning infancy through adolescence.
- Analysis incorporated nationally developed Japanese growth charts and mixed modeling that accounted for growth rate and anesthesiologist-level clustering.
Limitations
- Retrospective single-center design may reflect local practice patterns and selection preferences.
- The study evaluated clinically selected tube sizes and depths rather than prospectively testing a growth-chart-based algorithm against airway outcomes.
Future Directions: Prospective multicenter studies should test growth-chart-based tube selection algorithms, including cuffed tubes and children with obesity, growth impairment, craniofacial anomalies, or difficult airways. Studies should determine whether algorithmic selection reduces malposition, repeated laryngoscopy, and peri-intubation complications.
PURPOSE: This study aimed to describe the distribution of clinically selected endotracheal tube size and insertion depth in relation to pediatric growth charts in Japan. METHODS: This single-center retrospective analysis included patients aged 0-15 years who underwent general anesthesia at a university hospital in Japan between December 2006 and July 2023. The correlations between the average endotracheal tube size and depth curves and the growth charts, developed by the Japanese Society for Pediatric Endocrinology and the Japanese Association for Human Auxology, were determined using Pearson's correlation coefficient for the children with heights and weights within ± 2 standard deviations (SD) of the growth chart.