Evidence map›Paper›PMID 34993930›Full record

ArticleReproductive sciences (Thousand Oaks, Calif.)2022

Iron Deficiency Anaemia and Atonic Postpartum Haemorrhage Following Labour.

Terence T Lao, Lulu L Wong, Shuk Yi Annie Hui, Daljit S Sahota

Abstract read
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In one paragraph

Article in Reproductive sciences (Thousand Oaks, Calif.), 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 18 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
18citing papers in PubMed, 1 pooled it
–field-weighted citation impact
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

18 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
  2. Trial
  3. Review
  4. Article
  5. Article
  6. Von Willebrand disease: more than just a bleeding disorder.Research and practice in thrombosis and haemostasis · 2026
    Review
  7. Article
  8. Article
  9. Article
  10. Article
  11. Review
  12. Does induction or augmentation of labor increase the risk of postpartum hemorrhage in pregnant women with anemia? A multicenter prospective cohort study in India.International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics · 2025
    Article
  13. Article
  14. Article
  15. Article
  16. Forgotten Fundamentals: A Review of State Legislation on Nutrition for Incarcerated Pregnant and Postpartum People.Journal of correctional health care : the official journal of the National Commission on Correctional Health Care · 2024
    Review
  17. Characteristics and outcomes of pregnant women hospitalized with severe maternal outcomes in eastern Ethiopia: Results from the Ethiopian Obstetric Surveillance System study.International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics · 2024
    Article
  18. 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

4 authors.

Terence T LaoDepartment of Obstetrics & Gynaecology, Prince of Wales Hospital, The Chinese University of Hong Kong, 1/F, Block E, Shatin, Hong Kong, People's Republic of China. lao-tt@cuhk.edu.hk.ORCID 0000-0001-7315-8747
Lulu L WongDepartment of Obstetrics & Gynaecology, Prince of Wales Hospital, The Chinese University of Hong Kong, 1/F, Block E, Shatin, Hong Kong, People's Republic of China.
Shuk Yi Annie HuiDepartment of Obstetrics & Gynaecology, Prince of Wales Hospital, The Chinese University of Hong Kong, 1/F, Block E, Shatin, Hong Kong, People's Republic of China.
Daljit S SahotaDepartment of Obstetrics & Gynaecology, Prince of Wales Hospital, The Chinese University of Hong Kong, 1/F, Block E, Shatin, Hong Kong, People's Republic of China.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The purpose of this retrospective cohort study is to determine if iron deficiency anaemia (IDA) is associated with increased atonic postpartum haemorrhage (PPH) following labour. Women with singleton pregnancy carried to 24 or more weeks gestation, who were delivered under our care from 1997 to 2019, constituted the study population. A diagnosis of IDA was based on the finding of haemoglobin <10 g/dL and serum ferritin <15 μg/L in the absence of haemoglobinopathies. Women with elective caesarean section were excluded. Maternal characteristics, use of oxytocin, labour outcome and occurrence of PPH were compared between women with and without a diagnosis of IDA. The 1032 women (0.86%) with IDA exhibited slightly but significantly different maternal characteristics and had significantly higher incidence of total (4.5% versus 3.2%, p = 0.024) and atonic PPH (3.1% versus 2.0%, p = 0.011) despite similar incidences of labour induction, augmentation, and instrumental and intrapartum caesarean delivery. Multivariate analysis with adjustment for the effects of age, body mass index, height, parity, abortion history, labour induction and augmentation, instrumental delivery and infant macrosomia demonstrated that IDA was independently associated with total PPH (adjusted relative risk, aRR: 1.455, 95% confidence ratio, CI: 1.040-2.034) and atonic PPH (aRR: 1.588, 95% CI: 1.067-2.364). Our results indicate that despite the low prevalence in our population, IDA was independently associated with atonic PPH, probably consequent to placental adaptive changes in the presence of IDA. The correction and prevention of IDA could be the most important measure in countering the rising global prevalence of atonic PPH.

Indexed as

AnemiaIron DeficienciesPostpartum HemorrhageCesarean SectionFemaleHumansMalePlacentaPregnancyRetrospective StudiesAtonic postpartum haemorrhageIron deficiency anaemiaLabourPregnancy

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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.