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5.6 The Control of Hypertension In Pregnancy Study (CHIPS) randomised controlled trial
  1. LA Magee1,
  2. P von Dadelszen1,
  3. E Rey8,
  4. S Ross6,
  5. E Asztalos4,
  6. K Murphy4,
  7. JM Menzies1,
  8. J Sanchez4,
  9. J Singer1,
  10. A Gafni2,
  11. A Gruslin7,
  12. E Hutton2,
  13. SK Lee4,
  14. AG Logan4,
  15. JW Ganzevoort9,
  16. R Welch (Derriford Hosp)1,
  17. JG Thornton10
  1. 1University of British Columbia, Vancouver, Canada
  2. 2Universite de Montreal, Montreal, Canada
  3. 3University of Alberta, Edmonton, Canada
  4. 4University of Toronto, Toronto, Canada
  5. 5McMaster University, Hamilton, Canada
  6. 6University of Ottawa, Ottawa, Canada
  7. 7Universiite of Amsterdam, Amsterdam, Netherlands
  8. 8University of Nottingham, Nottingham, UK
  9. 9Universite de Sherbrooke, Sherbrooke, Canada
  10. 10University of Manitoba, Winnipeg, Canada


Background Most obstetricians believe that BP normalisation in pregnancy reduces maternal complications, but may increase adverse perinatal outcomes. No adequately powered trials of differential BP control have been performed.

Objective Determine best management of non-severe pregnancy hypertension.

Methods In an open pragmatic international multicentre trial, women at 14+0–33+6 wk gestation with non-proteinuric pre-existing or gestational hypertension, office diastolic blood pressure (dBP) 90–105 mmHg (or 85–105 mmHg if on antihypertensives) and a live fetus were randomised to ‘less tight’ (target dBP 100 mmHg) or ‘tight’ control (target dBP 85 mmHg). The composite primary outcome was pregnancy loss or high level neonatal care for >48 h in the first 28d of life, and the secondary one/more serious maternal complications before 6wks. Outcomes were compared between groups using logistic regression adjusted for key prognostic factors (alpha = 0.05, two-sided, intention-to-treat).

Results Of 1030 women randomised, 987 (94 sites) were included in the analysis. 74.6% had pre-existing hypertension. Women in ‘less tight’ (n=497) [vs. ‘tight’ (n = 490)] control had higher mean dBP by 4.5 mmHg (95% CI 3.6, 5.4), but similar rates of the primary (perinatal) outcome [31.4% vs. 30.7%; aOR 1.03, 95% CI 0.78, 1.36] and secondary (maternal) outcome [3.7% vs. 2.0%; aOR 1.74, 95% CI 0.79, 3.84]. Women receiving ‘less tight’ control more frequently developed BP ≥160/110mmHg) (40.4% vs. 27.5%; aOR 1.78, 95% CI 1.35, 2.36).

Interpretation ‘Tight’ control is safer for the mother. These data reassure that it has no adverse effects for the baby. A target dBP of 85mmHg should be aimed for.

Funding Canadian Institutes of Health Research.

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