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RCT of Zhi Byed 11 (ZB11) Versus Misoprostol in Tibet

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Trial Information

RCT of Zhi Byed 11 (ZB11) Versus Misoprostol in Tibet

Post-partum hemorrhage (PPH) is one of the main direct causes of maternal mortality,
particularly in rural areas with low access to skilled providers, blood banks, and surgical
facilities. In addition to the mortality, PPH also accounts for a great number of
morbidities, including anemia, renal and pulmonary problems, fatigue, and decreased
resistance to infection, all major health problems affecting women in the TAR. Clinical
research is rare in the Tibetan Autonomous Region (TAR) of the People’s Republic of China.
This trial will estimate the effect of prophylactic oral ZB 11 administered at the beginning
of the second stage of labor versus prophylactic oral misoprostol, administered in the third
stage of labor, in reducing the incidence of postpartum hemorrhage (defined as a measured
blood loss of > 500 cc).

An observational postpartum blood measurement study was conducted. This included data
collection on deliveries in three TAR hospital in Lhasa, piloting of consent forms and data
collection instruments, and training in the use of a plastic drape for the measurement of
postpartum blood loss.

This randomized, double masked trial will test the hypothesis that misoprostol is more
effective than ZB11 in reducing the frequency of postpartum hemorrhage (defined as either a
measured blood loss of > 500cc or administration of open label uterotonics within the one
hour observation period after delivery).

An original sample of 848 women was increased and 967 consenting women were randomized (1:1)
to a ZB11 or misoprostol arm. Since ZB 11 and misoprostol must be administered at different
times, participants will receive either active ZB 11 or corresponding placebo at full
dilation and active misoprostol or corresponding placebo immediately following the birth of
the baby. The effectiveness of the study drug will be estimated by the postpartum blood
loss that will be measured on all enrolled women with a blood collection drape.

Inclusion Criteria

Inclusion and Exclusion Criteria

Adult, pregnant women who satisfy all the following criteria may be enrolled in the study.
Pregnant women:

- who are delivering during the study period at one of the three hospitals

- who are 18 years of age or older at the time of delivery

- who are 28 weeks or more pregnant

- who are likely to have a normal vaginal delivery

- with singleton intrauterine pregnancy with vertex presentation either in early labor
or in anticipation of induction of labor, and

- whose fetus is alive (has a heart rate >100bpm) at the time of screening

- who are able to give informed consent.

Any of the following criteria will exclude a woman from study participation:

- pre-term labor (<28 weeks)

- previous or planned cesarean delivery

- current multiple gestations

- active hemorrhaging

- severe anemia (Hgh <7)

- hypertension (persistent BP>140/90 or greater OR hypertension requiring treatment)
[this criteria was omitted mid-study]

- maternal history of bleeding disorders

- known allergies to any medications (severe chronic allergic conditions)

- body temperature greater than 38C

- asthma (asthma requiring treatment)

- mental disability

- unable to focus on consent process due to imminent delivery

To be eligible for participation as a care provider, the participant must satisfy the
following criteria:

- obstetrical care provider to pregnant woman in the study

- at least 18 years of age

- must be a physician or nurse midwife

Type of Study:


Study Design:

Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double-Blind, Primary Purpose: Prevention

Outcome Measure:

Postpartum hemorrhage

Principal Investigator

Michael Varner, MD

Investigator Role:

Principal Investigator

Investigator Affiliation:

University of Utah


United States: Federal Government

Study ID:

GN 10



Start Date:

September 2005

Completion Date:

March 2007

Related Keywords:

  • Hemorrhage
  • Tibet
  • Third Stage Labor
  • Post Partum Hemorrhage
  • Misoprostol
  • Zhi Byed 11
  • Global Network
  • Hemorrhage