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Meta-Analysis
. 2024 Sep 27;22(1):418.
doi: 10.1186/s12916-024-03628-0.

Metformin use and preeclampsia risk in women with diabetes: a two-country cohort analysis

Hannah Gordon  1   2 , Noor Salim  3 , Stephen Tong  4   5 , Susan Walker  4   5 , Manarangi De Silva  4   5 , Catherine Cluver  4   5   6 , Parinaz Mehdipour  4   5 , Richard Hiscock  4   5 , Lauren Sutherland  7 , Ann Doust  7 , Lina Bergman  3   6   8   9 , Anna-Karin Wikström  3 , Anthea Lindquist  4   5 , Susanne Hesselman #  3   10 , Roxanne Hastie #  4   5   3
Affiliations
Meta-Analysis

Metformin use and preeclampsia risk in women with diabetes: a two-country cohort analysis

Hannah Gordon et al. BMC Med. .

Abstract

Background: Metformin is a hypoglycaemic medication that has been proposed to treat or prevent preeclampsia. Combining national birth data from Scotland and Sweden, we investigated whether metformin used during pregnancy was associated with an altered risk of developing a hypertensive disorder of pregnancy.

Methods: We utilised data from two population-based cohorts: Scotland (2012-2018) and Sweden (2007-2019). Nulliparous women with gestational diabetes or type 2 diabetes who had birth outcome data linked with medications prescribed during pregnancy were included. The association between metformin prescription and hypertensive disorders of pregnancy was characterised using inverse probability weighted regression analysis, adjusting for variables that predict metformin use and potential confounders. Adverse neonatal outcomes were included as secondary outcomes. Results from both countries were then combined in a meta-analysis using a random effects model.

Results: The Scottish cohort included 3859 women with gestational diabetes or type 2 diabetes. Of these women, 30.8% (n = 1187) received at least one metformin prescription during pregnancy. For Sweden, 7771 women with gestational diabetes were included where 19.3% (1498) used metformin during pregnancy. Metformin prescription was not associated with an altered risk of any hypertensive disorder of pregnancy (Scotland adjusted relative risk (aRR) 0.88 [95% confidence interval (CI) 0.66-1.19]; Sweden aRR 1.08 [95% CI 0.86-1.37]) or preeclampsia (Scotland aRR 1.02 [95% CI 0.66-1.60]; Sweden aRR 1.00 [95% CI 0.72-1.39]). Combining adjusted results in a meta-analysis produced similar findings, with a pooled RR of 0.98 (95% CI 0.79-1.18) for any hypertensive disorder and RR 1.01 ([95% CI 0.73-1.28]) for preeclampsia. For neonatal outcomes, metformin was associated with a reduced risk of birthweight > 4500 g in Scotland (aRR 0.39 [95% CI 0.21-0.71]) but not in Sweden. There was no association between metformin and preterm birth or birthweight < 3rd or < 10th percentiles. Pooling results from both countries, metformin was not associated with adverse neonatal outcomes, including preterm birth (RR 1.00 [95% CI 0.89-1.13]), and birthweight < 10th percentile (RR 0.82 [95% CI 0.60-1.13]) or < 3rd percentile (RR 0.78 [95% CI 0.41-1.48]).

Conclusions: In this two-country analysis, metformin use in pregnancy among women with diabetes was not associated with an altered risk of developing any hypertensive disorder of pregnancy. In the combined meta-analysis, metformin was not associated with an altered risk of adverse neonatal outcomes.

Keywords: Gestational diabetes; Gestational hypertension; Metformin; Pre-eclampsia; Pregnancy; Pregnancy-induced hypertension.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Fig. 1
Fig. 1
Participant flow diagram
Fig. 2
Fig. 2
Meta-analysis of metformin use in pregnancy and hypertensive disorders of pregnancy
See this image and copyright information in PMC

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