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Wilson MG, Bone JN, Slade LJ, Mistry HD, Singer J, Crozier SR, Godfrey KM, Baird J, von Dadelszen P, Magee LA. Blood pressure measurement and adverse pregnancy outcomes: A cohort study testing blood pressure variability and alternatives to 140/90 mmHg. BJOG 2023. [PMID: 38054262 DOI: 10.1111/1471-0528.17724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 10/19/2023] [Accepted: 11/07/2023] [Indexed: 12/07/2023]
Abstract
OBJECTIVE To examine the association with adverse pregnancy outcomes of: (1) American College of Cardiology/American Heart Association blood pressure (BP) thresholds, and (2) visit-to-visit BP variability (BPV), adjusted for BP level. DESIGN An observational study. SETTING Analysis of data from the population-based UK Southampton Women's Survey (SWS). POPULATION OR SAMPLE 3003 SWS participants. METHODS Generalised estimating equations were used to estimate crude and adjusted relative risks (RRs) of adverse pregnancy outcomes by BP thresholds, and by BPV (as standard deviation [SD], average real variability [ARV] and variability independent of the mean [VIM]). Likelihood ratios (LRs) were calculated to evaluate diagnostic test properties, for BP at or above a threshold, compared with those below. MAIN OUTCOME MEASURES Gestational hypertension, severe hypertension, pre-eclampsia, preterm birth (PTB), small-for-gestational-age (SGA) infants, neonatal intensive care unit (NICU) admission. RESULTS A median of 11 BP measurements were included per participant. For BP at ≥20 weeks' gestation, higher BP was associated with more adverse pregnancy outcomes; however, only BP <140/90 mmHg was a good rule-out test (negative LR <0.20) for pre-eclampsia and BP ≥140/90 mmHg a good rule-in test (positive LR >8.00) for the condition. BP ≥160/110 mmHg could rule-in PTB, SGA infants and NICU admission (positive LR >5.0). Higher BPV (by SD, ARV, or VIM) was associated with gestational hypertension, severe hypertension, pre-eclampsia, PTB, SGA and NICU admission (adjusted RRs 1.05-1.39). CONCLUSIONS While our findings do not support lowering the BP threshold for pregnancy hypertension, they suggest BPV could be useful to identify elevated risk of adverse outcomes.
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Affiliation(s)
- Milly G Wilson
- Department of Women and Children's Health, Faculty of Medicine, School of Life Course and Population Sciences, King's College London, London, UK
| | - Jeffrey N Bone
- British Columbia Children's Hospital Research Institute, University of British Columbia, Vancouver, British Columbia, Canada
- Department of Obstetrics and Gynaecology, University of British Columbia, Vancouver, British Columbia, Canada
| | - Laura J Slade
- Robinson Research Institute, The University of Adelaide, Adelaide, South Australia, Australia
- Department of Obstetrics and Gynaecology, Women's and Children's Hospital, Adelaide, South Australia, Australia
| | - Hiten D Mistry
- Department of Women and Children's Health, Faculty of Medicine, School of Life Course and Population Sciences, King's College London, London, UK
| | - Joel Singer
- School of Population and Public Health, University of British Columbia, Vancouver, British Columbia, Canada
| | - Sarah R Crozier
- MRC Lifecourse Epidemiology Centre, University of Southampton, Southampton, UK
- NIHR Applied Research Collaboration Wessex, Southampton Science Park, Southampton, UK
| | - Keith M Godfrey
- MRC Lifecourse Epidemiology Centre, University of Southampton, Southampton, UK
- NIHR Southampton Biomedical Research Centre, University of Southampton and University Hospital Southampton NHS Foundation Trust, Southampton, UK
| | - Janis Baird
- MRC Lifecourse Epidemiology Centre, University of Southampton, Southampton, UK
- NIHR Applied Research Collaboration Wessex, Southampton Science Park, Southampton, UK
- NIHR Southampton Biomedical Research Centre, University of Southampton and University Hospital Southampton NHS Foundation Trust, Southampton, UK
| | - Peter von Dadelszen
- Department of Women and Children's Health, Faculty of Medicine, School of Life Course and Population Sciences, King's College London, London, UK
| | - Laura A Magee
- Department of Women and Children's Health, Faculty of Medicine, School of Life Course and Population Sciences, King's College London, London, UK
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