Evidence map›Paper›PMID 33438172›Full record

SynthesisCanadian journal of anaesthesia = Journal canadien d'anesthesie2021

Comparison of videolaryngoscopy and direct laryngoscopy for tracheal intubation in obstetrics: a mixed-methods systematic review and meta-analysis.

Ryan Howle, Desire Onwochei, Siew-Ling Harrison, Neel Desai

Open access · bronzeAbstract readMeta-AnalysisSystematic Review
PubMed Publisher
In one paragraph

Synthesis in Canadian journal of anaesthesia = Journal canadien d'anesthesie, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.

0numbers the graph read from it
0cells of the map it votes in
15citing papers in PubMed
8.5field-weighted citation impact, top 2% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

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.

2 · The registry

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.

3 · Its place in the literature

Who cites it

15 citing papers in PubMed, 45 citations in OpenAlex.

  1. Trial
  2. Airway management in the obstetric patient: management strategyRevista colombiana de obstetricia y ginecologia · 2026
    Review
  3. Article
  4. Article
  5. General anesthesia for cesarean delivery: Israeli national survey.Journal of anesthesia, analgesia and critical care · 2025
    Article
  6. Review
  7. Review
  8. Article
  9. Article
  10. Article
  11. Review
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors at 3 institutions in 1 country.

Ryan HowleDepartment of Anaesthesia, Royal Marsden NHS Foundation Trust, London, UK. ryanhowle@doctors.org.uk.ORCID http://orcid.org/0000-0001-6172-2101
Desire OnwocheiDepartment of Anaesthesia, Guy's and St Thomas' NHS Foundation Trust, London, UK.
Siew-Ling HarrisonDepartment of Anaesthesia, Guy's and St Thomas' NHS Foundation Trust, London, UK.
Neel DesaiDepartment of Anaesthesia, Guy's and St Thomas' NHS Foundation Trust, London, UK.
King's College London · GBGuy's and St Thomas' NHS Foundation Trust · GBRoyal Marsden NHS Foundation Trust · GB

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeThe incidence of difficult and failed intubation is higher in obstetrical patients than in the general population because of anatomic and physiologic changes in pregnancy. Videolaryngoscopy improves the success rate of intubation and reduces complications when compared with direct laryngoscopy in adults; however, it is not known whether this extends to obstetrical surgery. The aim of this study was to examine the efficacy, efficiency, and safety of videolaryngoscopy compared with direct laryngoscopy in obstetrics. SOURCE: Central, CINAHL, Embase, MEDLINE and Web of Science databases were searched from inception to 27 May 2020 with no restrictions. Inclusion criteria included randomized-controlled trials (RCTs), observational studies, case series, and case reports that reported the application of videolaryngoscopy to intubate the trachea in pregnant patients having general anesthesia. PRINCIPAL

findingsOverall, four RCTs with 428 participants, nine observational studies, and 35 case reports/series with 100 participants were included. On meta-analysis of three trials, the co-primary outcomes of first-attempt success rate (risk ratio, 1.02; 95% confidence intervals [CI], 0.98 to 1.06; P = 0.29; I2 = 0%) and time to tracheal intubation (mean difference, 1.20 sec; 95% CI, -6.63 to 9.04; P = 0.76; I

conclusionsEvidence for the utility of videolaryngoscopy continues to evolve but supports its increased adoption in obstetrics where videolaryngoscopes should be immediately available for use as a first-line device.

trial registrationPROSPERO (CRD42020189521); registered 6 July 2020.

Indexed as

LaryngoscopesObstetricsAdultHumansIntubation, IntratrachealLaryngoscopyTracheaVideo Recording

Identifiers

PMID33438172
OpenAlexW3121058412

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

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.