Intravenous (IV) Nitroglycerin for Versions in Multiparous Women (INVERT (02))

University of Calgary

Status: Completed

Conditions: Pregnancy Complication; Breech Presentation

Treatments: Drug: Normal saline; Drug: IV Nitroglycerin

Study type: Interventional

Funder types: Other

Identifiers

NCT00901758

CHREB #16682

INVERT-02

Details and patient eligibility

About

Breech presentations (where a baby presents with feet or bottom down) have an increased risk of perinatal and neonatal complications, and are usually delivered by cesarean section. As an alternative, so that the baby can be delivered vaginally, an attempt can be made to turn the baby so that it is head down: this manoeuvre is called an external cephalic version (ECV).

Drugs that relax the uterus (tocolytic agents) are sometimes used to help improve ECV success rates. Nitroglycerin is a tocolytic agent, but intravenous nitroglycerin has not been tested as an agent to help ECV. There is some suggestion that nitroglycerin may be more helpful in women who have not previously been pregnant (nulliparous women) than in women who have been pregnant more than once (multiparous women), and so we have planned two trials.

This study is designed to answer the following questions for multiparous women:

Will administration of IV nitroglycerin for uterine relaxation improve ECV success rates? Will an increase in ECV success result in a decreased cesarean section rate?

Enrollment: 44 patients

Sex: Female

Volunteers: No Healthy Volunteers

Inclusion criteria

• any non-cephalic presentation
• singleton pregnancy
• >/= 37 weeks gestational age
• normal amniotic fluid volume
• reassuring fetal heart rate

Exclusion criteria

• labor
• ruptured membranes
• history of third trimester bleeding
• any pre-existing uterine scar
• pregnancy induced hypertension and gestational diabetes
• oligohydramnios and polyhydramnios
• intrauterine growth restriction or macrosomia
• hypotension or any serious medical illness
• inability to comprehend consent form

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Triple Blind

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44 participants in 2 patient groups, including a placebo group

2

Placebo Comparator group

Description:

Placebo solution was normal saline. After an initial 1mL dose, further doses could be given in 1-3mL increments until uterine relaxation was achieved, or up to a recommended maximum of 10mL.

Treatment:

Drug: Normal saline

1

Active Comparator group

Description:

Treatment solution consisted of 100micrograms/mL of nitroglycerin. After an initial 1mL dose, further doses could be given in 1-3mL increments until uterine relaxation was achieved, or up to a recommended maximum of 10mL.

Treatment:

Drug: IV Nitroglycerin