Less-tight versus tight control of hypertension in pregnancy

Magee, Laura A. and von Dadelszen, Peter and Rey, Evelyne and Ross, Susan and Asztalos, Elizabeth and Murphy, Kellie E. and Menzies, Jennifer and Sanchez, Johanna and Singer, Joel and Gafni, Amiram and Gruslin, Andrée and Helewa, Michael and Hutton, Eileen and Lee, Shoo K. and Lee, Terry and Logan, Alexander G. and Ganzevoort, Wessel and Welch, Ross and Thornton, Jim and Moutquin, Jean-Marie (2015) Less-tight versus tight control of hypertension in pregnancy. New England Journal of Medicine, 372 (5). pp. 407-417. ISSN 1533-4406

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Abstract

BACKGROUND

The effects of less-tight versus tight control of hypertension on pregnancy complications are unclear.

METHODS

We performed an open, international, multicenter trial involving women at 14 weeks 0 days to 33 weeks 6 days of gestation who had nonproteinuric preexisting or gestational hypertension, office diastolic blood pressure of 90 to 105 mm Hg (or 85 to 105 mm Hg if the woman was taking antihypertensive medications), and a live fetus. Women were randomly assigned to less-tight control (target diastolic blood pressure, 100 mm Hg) or tight control (target diastolic blood pressure, 85 mm Hg). The composite primary outcome was pregnancy loss or high-level neonatal care for more than 48 hours during the first 28 postnatal days. The secondary outcome was serious maternal complications occurring up to 6 weeks post partum or until hospital discharge, whichever was later.

RESULTS

Included in the analysis were 987 women; 74.6% had preexisting hypertension. The primary-outcome rates were similar among 493 women assigned to less-tight control and 488 women assigned to tight control (31.4% and 30.7%, respectively; adjusted odds ratio, 1.02; 95% confidence interval [CI], 0.77 to 1.35), as were the rates of serious maternal complications (3.7% and 2.0%, respectively; adjusted odds ratio, 1.74; 95% CI, 0.79 to 3.84), despite a mean diastolic blood pressure that was higher in the less-tight-control group by 4.6 mm Hg (95% CI, 3.7 to 5.4). Severe hypertension (≥160/110 mm Hg) developed in 40.6% of the women in the less-tight-control group and 27.5% of the women in the tight-control group (P<0.001).

CONCLUSIONS

We found no significant between-group differences in the risk of pregnancy loss, high-level neonatal care, or overall maternal complications, although less-tight control was associated with a significantly higher frequency of severe maternal hypertension. (Funded by the Canadian Institutes of Health Research; CHIPS Current Controlled Trials number, ISRCTN71416914; ClinicalTrials.gov number, NCT01192412.)

Item Type: Article
Additional Information: Acceptance date is estimated.
Schools/Departments: University of Nottingham UK Campus > Faculty of Medicine and Health Sciences > School of Medicine > Division of Child Health, Obstetrics and Gynaecology
Identification Number: https://doi.org/10.1056/NEJMoa1404595
Depositing User: Thornton, Jim
Date Deposited: 18 Feb 2016 09:29
Last Modified: 19 Oct 2016 17:15
URI: http://eprints.nottingham.ac.uk/id/eprint/31818

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