Cited by 2Pregnancy and preeclampsia studiesBlood Pressure and Hypertension StudiesGestational Diabetes Research and Management

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Elevated Pre-Pregnancy Blood Pressure and the Risk of Adverse Pregnancy Outcomes: Evidence From a Nationwide Population-Based Study

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Jung, Yun Ji, Kim, Taesu, Kim, Young-Han·2025·Journal of Korean Medical Science

Abstract

BACKGROUND: Pre-pregnancy blood pressure (BP) has gained attention as a potential predictor of adverse pregnancy outcomes. However, data on the impact of mildly elevated BP, particularly in women without overt hypertension, remain limited. In this study, we aimed to examine the association between pre-pregnancy BP and adverse pregnancy outcomes in women without a history of hypertension. METHODS: In this retrospective nationwide study, we included pregnant women with pre-pregnancy BP below 140/90 mmHg and no prior diagnosis of hypertension. Participants were categorized based on their pre-pregnancy BP into the normal BP (< 120/80 mmHg), elevated BP (120-129 and < 80 mmHg), and stage 1 hypertension (130-139 or 80-89 mmHg) groups. The following adverse pregnancy outcomes were recorded: preeclampsia, gestational diabetes, placental abruption, postpartum hemorrhage, preterm birth, and small or large for gestational age. Multivariable logistic regression was used to evaluate the associations between pre-pregnancy BP categories and adverse pregnancy outcomes. RESULTS: < 0.001). Compared to the normal BP group, adjusted odds ratios for adverse outcomes were 1.11 (95% confidence interval [CI], 1.07-1.14) for the elevated BP group and 1.24 (95% CI, 1.21-1.27) for the stage 1 hypertension group. A curvilinear relationship was observed between pre-pregnancy BP and the risk of adverse pregnancy outcomes. CONCLUSION: Even modest increases in pre-pregnancy BP below the clinical threshold for hypertension were associated with a higher risk of adverse pregnancy outcomes. These findings highlight the need for early BP monitoring and management before pregnancy.

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Crossref · 10.3346/jkms.2025.40.e302

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Fig. 1 Flowchart of the study selection. NHSE = National Health Screening Examination, SBP = systolic blood pressure, DBP = diastolic blood pressure, BP = blood pressure, HTN = hypertension.
Fig. 1 Flowchart of the study selection. NHSE = National Health Screening Examination, SBP = systolic blood pressure, DBP = diastolic blood pressure, BP = blood pressure, HTN = hypertension.CC BY-NC · PubMed Central
Fig. 2 Forest plot showing associations between pre-pregnancy BP and adverse pregnancy outcomes. Adjusted ORs and 95% CIs for various obstetric complications were estimated using multivariate logistic regression. The normal BP group was used as the reference. The models were adjusted for maternal age, pre-pregnancy BMI, fasting glucose, AST, ALT, total cholesterol, and pregestational diabetes. The normal blood pressure group was used as the reference. BP = blood pressure, OR = odds ratio, CI = confidence interval, BMI = body mass index, AST = aspartate aminotransferase, ALT = alanine aminotransferase, GDM = gestational diabetes mellitus, SGA = small for gestational age, LGA = large for gestational age, HTN = hypertension.
Fig. 2 Forest plot showing associations between pre-pregnancy BP and adverse pregnancy outcomes. Adjusted ORs and 95% CIs for various obstetric complications were estimated using multivariate logistic regression. The normal BP group was used as the reference. The models were adjusted for maternal age, pre-pregnancy BMI, fasting glucose, AST, ALT, total cholesterol, and pregestational diabetes. The normal blood pressure group was used as the reference. BP = blood pressure, OR = odds ratio, CI = confidence interval, BMI = body mass index, AST = aspartate aminotransferase, ALT = alanine aminotransferase, GDM = gestational diabetes mellitus, SGA = small for gestational age, LGA = large for gestational age, HTN = hypertension.CC BY-NC · PubMed Central
Fig. 3 Non-linear association between pre-pregnancy blood pressure and adverse pregnancy outcomes. Restricted cubic spline plots showing the relationship between pre-pregnancy (A) SBP and (B) DBP with the risk of adverse pregnancy outcomes. Models were adjusted for maternal age, pre-pregnancy body mass index, fasting glucose, liver enzymes (aspartate aminotransferase and alanine aminotransferase), total cholesterol, and pregestational diabetes. SBP = systolic blood pressure, DBP = diastolic blood pressure, OR = odds ratio, CI = confidence interval.
Fig. 3 Non-linear association between pre-pregnancy blood pressure and adverse pregnancy outcomes. Restricted cubic spline plots showing the relationship between pre-pregnancy (A) SBP and (B) DBP with the risk of adverse pregnancy outcomes. Models were adjusted for maternal age, pre-pregnancy body mass index, fasting glucose, liver enzymes (aspartate aminotransferase and alanine aminotransferase), total cholesterol, and pregestational diabetes. SBP = systolic blood pressure, DBP = diastolic blood pressure, OR = odds ratio, CI = confidence interval.CC BY-NC · PubMed Central

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Metadata

Authors
Jung, Y. J., Kim, T., & Kim, Y.-H.
Affiliations
  • Yonsei University (KR)
  • Sungkyunkwan University (KR)
Corresponding author
Kim, Young-Han
Venue
Journal of Korean Medical Science
Publisher
XMLink
Published
2025
Volume
40
Issue
46
Pages
e302-e302
ISSN
  • 1011-8934 (ISSN-L)
  • 1598-6357
OpenAlex
W4415604346
Cited by
2
References
21
Citations by year
2026: 2
FWCI
2.34
Type
journal article
Language
en
Open access
Locations
  • Journal of Korean Medical Science (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
Funders
Yonsei University College of Medicine (6-2023-0099)
Topics
  • Health Sciences › Medicine › Obstetrics and Gynecology › Pregnancy and preeclampsia studies
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Blood Pressure and Hypertension Studies
  • Health Sciences › Medicine › Obstetrics and Gynecology › Gestational Diabetes Research and Management
Keywords
elevated blood pressure, stage 1 hypertension, adverse pregnancy outcomes, preeclampsia, gestational diabetes mellitus, placental abruption, postpartum hemorrhage, preterm birth, small for gestational age, large for gestational age, curvilinear relationship
MeSH terms
Abruptio Placentae, Adult, Blood Pressure, Female, Postpartum Hemorrhage, Humans, Hypertension, Pre-Eclampsia, Pregnancy, Pregnancy Outcome, Retrospective Studies, Risk Factors, Logistic Models, Odds Ratio, Diabetes, Gestational, Premature Birth, Republic of Korea

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