CHAP2 Pilot Project for Hypertension in Pregnancy

This pilot study, called CHAP2, is looking at how treating mild high blood pressure (hypertension) during pregnancy might affect the baby's birth weight. If you are pregnant, between 14 and 89 years old, and have blood pressure readings between 130-139/80-89mmHg before 20 weeks of pregnancy, you might be eligible. You would also need to be planning to deliver at UAB Hospital and receiving care at their prenatal clinics. The study will compare two approaches: one group will receive medication (Labetalol or Nifedipine) to keep blood pressure below 130/80mmHg, and the other group will receive usual care, where treatment starts if blood pressure is 140/90mmHg or higher. The main goal is to see if treating blood pressure to a lower target changes the baby's birth weight percentile at delivery. This study aims to gather information for a larger future study.

Study design
This is an interventional pilot study planning to enroll 74 participants. Participants will be randomly assigned to one of two groups: active treatment with Labetalol or Nifedipine, or usual care.
What's involved
At least weekly, a study team member will review participants' blood pressure readings. The study's primary endpoint, neonatal birthweight percentile, is measured at the delivery of the infant.
Compensation
Not stated in the trial record.
Follow-up
Participants are followed until the delivery of the infant, when neonatal birthweight percentile is measured.

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NCT05989581

Chronic Hypertension and Pregnancy 2 (CHAP2) Pilot Project

Recruiting
PHASE1Ages 14–89InterventionalTreatment
University of Alabama at Birmingham
~74 participants
Updated 2026-08-11 on ClinicalTrials.gov
What's tested:Labetalol or Nifedipine

At a glance

Recruiting sites
1 of 1 listed site is recruiting right now
RecruitingSuspended, closed, or not yet open
What they're measuring
Neonatal Birthweight percentile
Measured over at delivery of infant
Hypertension in Pregnancy
1 sites across 1 states
Alabama1

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Eligibility criteria

Inclusion

Viable singleton gestation
No fetal anomalies
Blood pressures 130-139/80-89mmHg on two occasions at least 4 hours apart prior to 20 weeks gestation
Planning to deliver at UAB Hospital
No indication for pregnancy termination
Receiving care at the UAB prenatal clinics

Exclusion

Declines Randomization
Known diagnosis of chronic hypertension ( BP ≥ 140/90mmHg) or current antihypertensive medication use
Fetal demise diagnosed prior to enrollment
Known major structural of chromosomal abnormalities prior to enrollment
Contraindication to first line antihypertensive (Nifedipine/ Labetalol)
Comorbidities requiring BP goals \< 130/80mmHg
  • Neonatal Birthweight percentileat delivery of infant

    To determine whether anti-HTN treatment to BP\<130/80mmHg in pregnant patients with Stage 1 HTN is associated with a difference in birthweight percentile at delivery