Last updated on March 2019

Chronic Hypertension and Pregnancy (CHAP) Project


Are you eligible to participate in this study?

You may be eligible for this study if you meet the following criteria:

  • Conditions: Hypertension
  • Age: Between 12 - 100 Years
  • Gender: Female

Inclusion Criteria:

  1. Women with chronic hypertension in pregnancy with new or untreated chronic hypertension, blood pressure 140-159 systolic or 90-104 diastolic OR known chronic hypertension on monotherapy and taking any antihypertensive and blood pressure 159/104 (including those with blood pressure <140/90);
  2. Singleton; and
  3. viable pregnancy <23 weeks of gestation.

Exclusion Criteria:

  1. Blood pressures prior to randomization 160 systolic or 105 diastolic (with or without treatment);
  2. Patients currently treated with >1 antihypertensive medication (more likely to have severe chronic hypertension);
  3. Multi-fetal pregnancy;
  4. Known secondary cause of chronic hypertension;
  5. High-risk co-morbidities for which treatment may be indicated:
    • Class C or higher diabetes mellitus
    • Chronic kidney disease - including baseline proteinuria (>300mg/24-hr, p/c ratio >0.3, or persistent 1+ proteinuria*) or creatinine >1.2.

*If a dipstick value at screening is more than trace, a clean catch or catheter urine should be obtained and re-tested by dipstick. If this shows trace or absence of protein, the patient is included. If it again shows 1+ protein, the patient is excluded until a 24-hr urine <300mg/24hr or p/c ratio is <0.3.

  • Cardiac disorders: cardiomyopathy, angina, CAD
  • Prior stroke
  • Retinopathy
  • Sickle cell disease; 6. Known major fetal anomaly; 7. Known fetal demise; 8. Suspected IUGR; 9. Membrane rupture or planned termination prior to randomization; 10. Plan to deliver outside the consortium centers (unless approved by the Clinical Coordinating Center) or unlikely to follow-up in the opinion of study staff or previous participation in this trial; 11. Contraindication to labetalol or nifedipine (e.g. know hypersensitivity); and (12) Current substance abuse or addiction (cocaine, methamphetamine) *The minimum age varies by center

Recruitment Status: Open


Brief Description Eligibility Contact Research Team


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