SynthesisCanadian journal of anaesthesia = Journal canadien d'anesthesie2024
Indirect laryngoscopy is more effective than direct laryngoscopy when tracheal intubation is performed by novice operators: a systematic review, meta-analysis, and trial sequential analysis.
Synthesis in Canadian journal of anaesthesia = Journal canadien d'anesthesie, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers, 2 of them syntheses that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
9 citing papers in PubMed, 2 syntheses or guidelines pooled it.
- Effectiveness of indirect versus direct laryngoscopes for nasotracheal intubation in adults undergoing elective surgery: a systematic review and network meta-analysis.Canadian journal of anaesthesia = Journal canadien d'anesthesie · 2026Pooled it
- Videolaryngoscopy versus direct laryngoscopy for paediatric tracheal intubation: a systematic review with meta-analysis and trial sequential analysis.British journal of anaesthesia · 2025Pooled it
- Is Direct Laryngoscopy Antiquated and Irrelevant Today?Anesthesia progress · 2025Article
- Seeing Beyond the Human Eye: The Video Laryngoscope as the Anesthesiologist's Backup Camera.Cureus · 2025Article
- Comparison of Video Laryngoscope (VL) and Intubating Laryngeal Mask Airway (I-LMA) for Endotracheal Intubation in a Manikin with Restricted Neck Motion.Archives of academic emergency medicine · 2025Article
- Endotracheal Intubation Outside the Operating Room: Year in Review 2023.Respiratory care · 2024Review
- In reply: Initial clinical experience may influence tracheal intubation success rates with indirect laryngoscopy among novice operators.Canadian journal of anaesthesia = Journal canadien d'anesthesie · 2024Article
- Initial clinical experience may influence tracheal intubation success rates with indirect laryngoscopy among novice operators.Canadian journal of anaesthesia = Journal canadien d'anesthesie · 2024Article
- Evaluation of the Learning Curve of Endotracheal Intubation with Videolaryngoscopes: McGrathMAC, UESCOPE, and Airtraq by Young Anesthesiology Residents - Randomized, Controlled, Blinded Crossover Study.Advances in medical education and practice · 2024Article
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Authors and funding
4 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
purposeWe sought to perform a systematic review and meta-analysis to determine whether indirect laryngoscopy has an advantage over direct laryngoscopy in terms of the tracheal intubation rate, glottic visualization, and intubation time when used by novice operators.
methodsWe extracted adult prospective randomized trials comparing tracheal intubation with indirect vs direct laryngoscopy in novice operators from electronic databases. We extracted the following data from the identified studies: success rate, glottic visualization, and intubation time. Data from each trial were combined via a random-effects model to calculate the pooled relative risk (RR) or weighted mean difference (WMD) with a 95% confidence interval (CI). We also performed a trial sequential analysis.
resultsWe included 15 articles (17 trials) comprising 2,290 patients in the systematic review. Compared with the direct laryngoscopy, indirect laryngoscopy improved success rate (RR, 1.15; 95% CI, 1.07 to 1.24; P = 0.0002; I
conclusionIn this systematic review, we found that the tracheal intubation success rate, glottic visualization, and intubation time were improved when novice operators used indirect laryngoscopy rather than direct laryngoscopy. Trial sequential analysis results indicated that the sample size was sufficient for examining the success rate and intubation time. STUDY REGISTRATION: PROSPERO (CRD42022309045); first registered 4 September 2022.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.