Evidence map›Paper›PMID 33556082›Full record

SynthesisPloS one2021

Interventions to minimize blood loss in very preterm infants-A systematic review and meta-analysis.

Emma Persad, Greta Sibrecht, Martin Ringsten, Simon Karlelid, Olga Romantsik, Tommy Ulinder, Israel Júnior Borges do Nascimento, Maria Björklund, Anneliese Arno, Matteo Bruschettini

Open access · goldAbstract readMeta-AnalysisSystematic Review
In one paragraph

Synthesis in PloS one, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers, 4 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
16citing papers in PubMed, 4 pooled it
2.2field-weighted citation impact, top 12% 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

16 citing papers in PubMed, 4 syntheses or guidelines pooled it, 18 citations in OpenAlex.

  1. Minimizing blood sampling in preterm infants.The Cochrane database of systematic reviews · 2026
    Pooled it
  2. Pooled it
  3. [Clinical practice guidelines for the diagnosis and treatment of anemia of prematurity (2025)].Zhongguo dang dai er ke za zhi = Chinese journal of contemporary pediatrics · 2025
    Guideline
  4. Pooled it
  5. Article
  6. Review
  7. Article
  8. Article
  9. Article
  10. Article
  11. Minimizing blood sampling in preterm infants.The Cochrane database of systematic reviews · 2024
    Article
  12. Article
  13. Article
  14. Article
  15. Article
  16. Review
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

10 authors at 5 institutions in 6 countries.

Emma PersadDepartment for Evidence-Based Medicine and Evaluation, Danube University Krems, Krems an der Donau, Austria.ORCID 0000-0003-2719-3685
Greta SibrechtPoznan University of Medical Sciences, Poznan, Poland.ORCID 0000-0002-8905-7921
Martin RingstenDepartment of Pediatrics, Lund University, Lund, Sweden.ORCID 0000-0003-4456-9760
Simon KarlelidDepartment of Pediatrics, Lund University, Lund, Sweden.
Olga RomantsikDepartment of Pediatrics, Lund University, Lund, Sweden.ORCID 0000-0003-1414-9386
Tommy UlinderDepartment of Pediatrics, Lund University, Lund, Sweden.
Israel Júnior Borges do NascimentoUniversity Hospital and School of Medicine, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.ORCID 0000-0001-5240-0493
Maria BjörklundLibrary & ICT, Faculty of Medicine, Lund University, Lund, Sweden.ORCID 0000-0001-8027-1297
Anneliese ArnoEppi-Centre, Institute of Education, University College London, London, United Kingdom.ORCID 0000-0002-5333-1781
Matteo BruschettiniDepartment of Pediatrics, Lund University, Lund, Sweden.
Lund University · SEPoznan University of Medical Sciences · PLUniversidade Federal de Minas Gerais · BRUniversität für Weiterbildung Krems · ATUniversity College London · GB

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Blood loss in the first days of life has been associated with increased morbidity and mortality in very preterm infants. In this systematic review we included randomized controlled trials comparing the effects of interventions to preserve blood volume in the infant from birth, reduce the need for sampling, or limit the blood sampled. Mortality and major neurodevelopmental disabilities were the primary outcomes. Included studies underwent risk of bias-assessment and data extraction by two review authors independently. We used risk ratio or mean difference to evaluate the treatment effect and meta-analysis for pooled results. The certainty of evidence was assessed using GRADE. We included 31 trials enrolling 3,759 infants. Twenty-five trials were pooled in the comparison delayed cord clamping or cord milking vs. immediate cord clamping or no milking. Increasing placental transfusion resulted in lower mortality during the neonatal period (RR 0.51, 95% CI 0.26 to 1.00; participants = 595; trials = 5; I2 = 0%, moderate certainty of evidence) and during first hospitalization (RR 0.70, 95% CI 0.51, 0.96; 10 RCTs, participants = 2,476, low certainty of evidence). The certainty of evidence was very low for the other primary outcomes of this review. The six remaining trials compared devices to monitor glucose levels (three trials), blood sampling from the umbilical cord or from the placenta vs. blood sampling from the infant (2 trials), and devices to reintroduce the blood after analysis vs. conventional blood sampling (1 trial); the certainty of evidence was rated as very low for all outcomes in these comparisons. Increasing placental transfusion at birth may reduce mortality in very preterm infants; However, extremely limited evidence is available to assess the effects of other interventions to reduce blood loss after birth. In future trials, infants could be randomized following placental transfusion to different blood saving approaches. Trial registration: PROSPERO CRD42020159882.

Indexed as

Infant, Extremely PrematureBlood GlucoseCarbon DioxideConstrictionDelivery, ObstetricHemorrhageHumansInfant, NewbornOxygenBlood GlucoseCarbon DioxideOxygen

Identifiers

PMID33556082
PMCPMC7870155
OpenAlexW3126185372

What OpenQuestion holds

Textmetadata
LicenceCC BY
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.