Evidence map›Paper›PMID 33872397›Full record

ArticleInternational journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics2021

Hematologic adaptation to mask-wearing among pregnant women and obstetrical outcome during the coronavirus disease 2019 pandemic.

Lior Friedrich, Gabriel Levin, Nitzan Maixner, Yossi Bart, Abraham Tsur, Yoav Yinon, Raanan Meyer

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PubMed Full text at PMC Publisher
In one paragraph

Article in International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
4citing papers in PubMed, 2 pooled it
0.5field-weighted citation impact, top 32% 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

4 citing papers in PubMed, 2 syntheses or guidelines pooled it, 7 citations in OpenAlex.

  1. Pooled it
  2. Pooled it
  3. Article
  4. Article
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

7 authors at 4 institutions in 1 country.

Lior FriedrichFaculty of Health Sciences, The Joyce & Irving Goldman Medical School, Ben-Gurion University of the Negev, Beer Sheva, Israel.
Gabriel LevinThe Department of Obstetrics and Gynecology, Hadassah-Hebrew University Medical Center, Jerusalem, Israel.
Nitzan MaixnerFaculty of Health Sciences, The Joyce & Irving Goldman Medical School, Ben-Gurion University of the Negev, Beer Sheva, Israel.
Yossi BartThe Department of Obstetrics and Gynecology, The Chaim Sheba Medical Center, Ramat-Gan, Israel.
Abraham TsurThe Department of Obstetrics and Gynecology, The Chaim Sheba Medical Center, Ramat-Gan, Israel.
Yoav YinonThe Department of Obstetrics and Gynecology, The Chaim Sheba Medical Center, Ramat-Gan, Israel.
Raanan MeyerThe Department of Obstetrics and Gynecology, The Chaim Sheba Medical Center, Ramat-Gan, Israel.
Sheba Medical Center · ILBen-Gurion University of the Negev · ILHadassah Medical Center · ILTel Aviv University · IL

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectiveTo evaluate the effect of the coronavirus disease 2019 (COVID-19) mask-wearing on hematological laboratory components and obstetrical outcomes among women delivering during the COVID-19 pandemic.

methodsLaboratory results and obstetrical outcomes of women with singleton gestations, admitted for delivery during the COVID-19 mask-wearing period (April-June 2020) were compared with those of women delivering during the parallel period in 2019 and with a larger cohort derived from nine pre-pandemic years (March 2011-April 2020).

resultsOverall, 1838 women delivered during the COVID-19 pandemic. Compared with the pre-pandemic period, mean hemoglobin and fibrinogen levels were significantly higher during the mask-wearing period (12.15 ± 1.1 vs 11.96 ± 1.2, P < 0.001 and 472 ± 103.6 vs 448 ± 85.1 mg/dl, P < 0.001, respectively). Platelet levels were lower (200 ± 56.0 vs 206 ± 57.5 K/µl, P < 0.001). The rate of delivery at <34 weeks of gestation was lower during the mask-wearing period (1.1% vs 2%, odds ratio [OR] 0.57, 95% confidence intervals [CI] 0.37-0.88, P = 0.01), whereas cesarean delivery and postpartum hemorrhage rates were higher (26.7% vs 24.4%, OR 1.13, 95% CI 1.02-1.25, P = 0.022 and 4.1% vs 2.8%, OR 1.5, 95% CI 1.2-1.8, P = 0.001, respectively).

conclusionA hard-to-ventilate space created by wearing a mask during the COVID-19 era may be the underlying cause of the observed higher hemoglobin level among pregnant women, possibly affecting obstetrical outcomes.

Indexed as

MasksTerm BirthAdultBlood PlateletsCesarean SectionCohort StudiesCOVID-19FemaleFibrinogenHemoglobinsHospitalizationHumansPandemicsPregnancyPregnant PeopleSARS-CoV-2FibrinogenHemoglobinscesarean deliverycoronavirus disease 2019hemoglobinmask-wearingpreterm birth

Identifiers

PMID33872397
PMCPMC9087669
OpenAlexW3152751936

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.