Plain English Summary
Background and study aims
Vaginal birth (delivery of a baby through the vagina without medical assistance) is the natural way for a baby to be born. This type of childbirth is made up of three distinct stages. The first is where the body prepares for the birth (contractions cause the cervix to dilate), the second is where the baby is actually born (passing through the cervix and out of the body) and the third is where the placenta (the organ which connects the mother’s blood supply to the baby’s via the umbilical cord, providing the baby with food and oxygen) is delivered. During the third stage of labour, bleeding is not uncommon and so medical teams often actively manage this stage to prevent a woman from losing too much blood. After the baby is born, a hormone called oxytocin acts to keep the contractions going so that the placenta can be delivered and any blood vessels attached to it can be closed off, preventing excessive bleeding (postpartum haemorrhage). By giving the woman an injection containing artificial oxytocin, it can help speed up the delivery of the placenta and prevent excess bleeding. This injection can be given a number of ways, such as directly into the bloodstream or into muscle, however it is not known which is the most effective. The aim of this study is to find out the most effective technique of giving oxytocin to women in labour to prevent bleeding.
Who can participate?
Women who have been pregnant for more than 36 weeks with one baby, who are expected to have a vaginal delivery.
What does the study involve?
Participants are randomly allocated to one of two groups. Participants in both groups receive two injections (the drug and a dummy) in order to ensure that the way the drug is given is kept secret. Participants in the first group receive an intramuscular injection (injection directly into the muscle) of 1ml oxytocin, and a dummy (placebo) intravenous injection (injection directly into a vein) of 1ml normal saline (salt water). Participants in the second group receive an intravenous injection of 1ml oxytocin and a placebo injection of 1ml normal saline. Following delivery, all participants’ medical notes are reviewed in order to find out how many experienced postpartum haemorrhage. Participants in both groups also have a blood sample taken before delivery and 24 hours after delivery in order to measure any changes in the amount of haemoglobin (iron-containing oxygen-carrying part of red blood cells).
What are the possible benefits and risks of participating?
Not provided at time of registration
Where is the study run from?
Coombe Women and Infants University Hospital (Ireland)
When is the study starting and how long is it expected to run for?
January 2012 to October 2017
Who is funding the study?
1. Trinity College Dublin (Ireland)
2. Coombe Women and Infants University Hospital (Ireland)
Who is the main contact?
Dr Francesco Pagnini
Trial website
Contact information
Type
Scientific
Primary contact
Prof Deirdre Murphy
ORCID ID
Contact details
Academic Department of Obstetrics and Gynaecology Trinity College Dublin
Coombe Women and Infants University Hospital
Dolphins Barn
Dublin
Dublin 8
Ireland
Type
Public
Additional contact
Dr Nita Adnan
ORCID ID
Contact details
Academic Department of Obstetrics and Gynaecology Trinity College Dublin
Coombe Women and Infants University Hospital
Dolphins Barn
Dublin
Dublin 8
Ireland
Additional identifiers
EudraCT number
2012-003352-36
ClinicalTrials.gov number
Protocol/serial number
012012
Study information
Scientific title
Intramuscular oxytocin versus intravenous oxytocin to prevent haemorrhage at vaginal delivery - A randomised controlled trial
Acronym
LabOR Trial (Labour Oxytocin Randomised Trial)
Study hypothesis
Intravenous oxytocin used at vaginal delivery will reduce the risk of postpartum haemorrhage compared to intramuscular oxytocin.
Ethics approval
1. Research Ethics Committee of National Maternity Hospital, 29/06/2015
2. Research Ethics Committee of Commbe Women and Infants University Hospital, 30/10/2015, ref: 26-2015
Study design
Single-centre double-blind randomised controlled trial
Primary study design
Interventional
Secondary study design
Randomised controlled trial
Trial setting
Hospitals
Trial type
Prevention
Patient information sheet
Not available in web format, please use the contact details to request a patient information sheet
Condition
Postpartum haemorrhage following vaginal delivery
Intervention
Participants will be randomised into one of two study arms:
Arm one: Participants will receive 1ml 10IU oxytocin intramuscularly and 1ml 0.9% normal saline as placebo intravenously immediately after the delivery of the baby and before the delivery of the placenta at vaginal delivery.
Arm two: Participants will receive 1ml 10IU oxytocin intravenously and 1ml 0.9% normal saline as placebo intramuscularly immediately after the delivery of the baby and before the delivery of the placenta at vaginal delivery.
The blood loss following normal vaginal delivery will be measured using gravimetric method. The blood loss would be estimated by weighing all the soiled materials on a scale and subtracting the known weights of these materials to determine the blood loss. For women who have an assisted vaginal delivery, Comfy Guard ® (a surgical drape with a pouch for collecting vaginal blood loss) will be placed under the woman’s buttocks in preparation for birth and before delivery of the placenta. The blood collected in the drape will be transferred to a measuring jar with calibrations. Blood-soaked swabs and drapes will be weighed and the known dry weight of the swabs and drapes will be subtracted. This volume will be added to the measured blood volume from the drape.The measured blood loss is recorded in the participant’s medical notes by the attending midwife. Maternal vital signs will be measured after delivery and before transfer to the postnatal ward, which are recorded in the medical notes. The occurrence of side effects will be recorded using an observation form.
Follow-up: A full blood count will be performed at day 1 after delivery to assess haemoglobin and haematocrit. Data will be collected in duplicate on a case report form (CRF) by reviewing patient’s/participant’s medical notes after the delivery and prior to discharge from the hospital.
Intervention type
Drug
Phase
Not Applicable
Drug names
Syntocinon
Primary outcome measure
Incidence of primary postpartum haemorrhage (> 500ml) following intramuscular oxytocin compared with intravenous oxytocin is determined by reviewing participant’s medical notes and data collected in a case report form (CRF) 24 hours post-delivery.
Secondary outcome measures
1. Incidence of side effects following administration of oxytocin (headache, vomiting) is determined by reviewing an observation sheet that the attending midwife are required to fill within 30 minutes of delivery and oxytocin administration. The vital signs which are taken after delivery and prior to transfer to the postnatal ward are recorded in the medical notes. Occurrence of hypotension, tachycardia are recorded in the CRF by reviewing the medical notes.
2. Estimated mean blood loss and early lochial loss is determined by reviewing participant’s medical notes
3. Incidence of major obstetric haemorrhage (measured blood loss ≥ 1000ml) is determined by reviewing participant’s medical notes 24 hours post-delivery
4. Objective change in haemoglobin and haematocrit is measured using a full blood count before delivery and 24 hours after delivery
5. Incidence of severe anaemia (Hb fall ≥ 20%) is measured using a full blood count before delivery and 24 hours after delivery
6. Need for blood transfusion and/or blood products is determined by reviewing the participant’s medical notes 24 hours post-delivery
7. Postnatal length of stay in labour ward/HDU and in the hospital is determined by reviewing participant’s medical notes
8. Need for an additional uterotonic agent between the two groups is determined by reviewing the participant’s medical notes 24 hours post-delivery
Overall trial start date
01/01/2012
Overall trial end date
30/01/2018
Reason abandoned (if study stopped)
Eligibility
Participant inclusion criteria
1. Aged 18 or over
2. Female participants only
3. Singleton pregnancy at more than 36 weeks gestation
4. Those anticipated to have a vaginal delivery
Participant type
Patient
Age group
Adult
Gender
Female
Target number of participants
A total of 1000 participants. 500 in each arm
Participant exclusion criteria
1. Women who opted for physiological management of the third stage of labour
2. Those who have an antenatal decision for 40IU oxytocin infusion prophylactically following a vaginal delivery
3. Those whom the clinician has a preferred route of administering prophylactic oxytocin for the third stage of labour
4. Those who are deemed to be at risk of postpartum haemorrhage - Previous history of atonic primary postpartum haemorrhage, multiple fibroids, coagulation disorders, thrombocytopenia and receiving anticoagulants
5. Those with previous cardiovascular disorder
Recruitment start date
04/01/2016
Recruitment end date
13/12/2017
Locations
Countries of recruitment
Ireland
Trial participating centre
Coombe Women and Infants University Hospital
Dolphins Barn
Dublin
Dublin 8
Ireland
Sponsor information
Organisation
Coombe Women and Infants University Hospital
Sponsor details
Dolphins Barn
Dublin
Dublin 8
Ireland
+353 (0)1 4085200
info@coombe.ie
Sponsor type
Hospital/treatment centre
Website
Funders
Funder type
Hospital/treatment centre
Funder name
Trinity College Dublin
Alternative name(s)
Coláiste na Tríonóide, Baile Átha Cliath, TCD
Funding Body Type
private sector organisation
Funding Body Subtype
Universities (academic only)
Location
Ireland
Funder name
The Coombe Women and Infants University Hospital
Alternative name(s)
Funding Body Type
Funding Body Subtype
Location
Results and Publications
Publication and dissemination plan
Planned dissemination of results through a final report prepared for the funding body and manuscripts submitted for publication in peer reviewed journals.
IPD sharing statement
The datasets generated and/or analysed during the current study during this study will be included in the subsequent results publication.
Intention to publish date
Participant level data
Other
Basic results (scientific)
Publication list
2017 protocol in: https://www.ncbi.nlm.nih.gov/pubmed/29141679
2018 results in: https://www.ncbi.nlm.nih.gov/pubmed/30181338 [added 20/03/2019]