Effect of first trimester crown rump length measurement on rates of induction of labour for postdates.
| ISRCTN | ISRCTN16877725 |
|---|---|
| DOI | https://doi.org/10.1186/ISRCTN16877725 |
| Secondary identifying numbers | SPGS 757 |
- Submission date
- 23/01/2004
- Registration date
- 23/01/2004
- Last edited
- 03/12/2008
- Recruitment status
- No longer recruiting
- Overall study status
- Completed
- Condition category
- Pregnancy and Childbirth
Prospectively registered
Protocol
Statistical analysis plan
Results
Individual participant data
Plain English summary of protocol
Not provided at time of registration
Contact information
Mr I Mackenzie
Scientific
Scientific
Nuffield Department of Obstetrics and Gynaecology
John Radcliffe Hospital
Oxford
OX3 9DU
United Kingdom
Study information
| Study design | Randomised controlled trial |
|---|---|
| Primary study design | Interventional |
| Secondary study design | Randomised controlled trial |
| Study setting(s) | Not specified |
| Study type | Not Specified |
| Scientific title | |
| Study objectives | The project is an RCT of the effect of first trimester ultrasound on rates of induction of labour for postdates. Currently it is widespread practice in most obstetric units in the United Kingdom to induce labour 14 days after the estimated date of delivery (EDD). While this has been shown to have a beneficial effect on perinatal outcome, it may cause consumer dissatisfaction as it is perceived to be a painful intervention in an otherwise normal pregnancy. Measurement of the biparietal diameter at 20 weeks gestation has been shown to improve the accuracy of gestational age assessment, and this should lead to a reduction in rates of induction of labour for postdates. Gestational age assessment using CRL in the 1st trimester is more accurate than the biparietal diameter and may further reduce the numbers requiring induction for postdates. There is an increasing shift to perform prenatal diagnosis in the first trimester. Those providing antenatal care may have to choose the best time at which a routine scan in pregnancy can be offered. If a first trimester ultrasound scan is shown to improve the customisation and therefore the appropriateness of obstetric care this would provide further evidence to justify its introduction as well as its use in screening for Down's syndrome, either with nuchal fold or as an adjunct to serum screening. The objective is to determine whether an ultrasound scan in the first trimester of pregnancy will lead to more accurate assessment of gestational age and consequently lead to a reduction in the number of pregnancies induced at term and fourteen days. If this is the case then there will be cost savings for the NHS, as well as the reduction in unnecessary and potentially painful interventions. |
| Ethics approval(s) | Not provided at time of registration |
| Health condition(s) or problem(s) studied | Pregnancy and childbirth: Childbirth |
| Intervention | The control group will continue with routine antenatal care with ultrasound performed for the usual indications. The intervention group will have an ultrasound scan between 8 and 12 weeks gestation to measure the crown-rump length (CRL) and if there is a discrepancy of greater than 5 days between the estimated date of delivery (EDD) calculated form the last menstrual period and that by CRL the EDD will be revised to that derived by scan. The EDD will be entered in the patient's obstetric notes and all subsequent management decisions will be based on this assessment of gestational age. |
| Intervention type | Other |
| Primary outcome measure | Rates of induction of labour for postdates |
| Secondary outcome measures | 1. The characteristics of labour with respect to the length of labour, the mode of delivery, the immediate perinatal outcome, analgesic requirements for labour and the overall client satisfaction with labour 2. Rates of gestation dependent events in pregnancy - false positive and negative outcomes from maternal serum screening 3. The management of early pregnancy complications |
| Overall study start date | 01/02/1999 |
| Completion date | 30/09/2002 |
Eligibility
| Participant type(s) | Patient |
|---|---|
| Age group | Adult |
| Sex | Female |
| Target number of participants | Added December 2008: 800 intended |
| Key inclusion criteria | Women in the first trimester of pregnancy who do not require a first trimester ultrasound for any other clinical indication. |
| Key exclusion criteria | Women will be excluded if there is a clinical indication for a first trimester ultrasound scan or if they refuse consent. Examples of the former would be if there was vaginal bleeding, uncertainty about viability of the pregnancy or the possibility of an ectopic pregnancy. |
| Date of first enrolment | 01/02/1999 |
| Date of final enrolment | 30/09/2002 |
Locations
Countries of recruitment
- England
- United Kingdom
Study participating centre
Nuffield Department of Obstetrics and Gynaecology
Oxford
OX3 9DU
United Kingdom
OX3 9DU
United Kingdom
Sponsor information
NHS R&D Regional Programme Register - Department of Health (UK)
Government
Government
The Department of Health
Richmond House
79 Whitehall
London
SW1A 2NL
United Kingdom
| Phone | +44 (0)20 7307 2622 |
|---|---|
| dhmail@doh.gsi.org.uk | |
| Website | http://www.doh.gov.uk |
Funders
Funder type
Government
NHS Executive South East (UK)
No information available
Results and Publications
| Intention to publish date | |
|---|---|
| Individual participant data (IPD) Intention to share | No |
| IPD sharing plan summary | Not provided at time of registration |
| Publication and dissemination plan | Not provided at time of registration |
| IPD sharing plan |
Study outputs
| Output type | Details | Date created | Date added | Peer reviewed? | Patient-facing? |
|---|---|---|---|---|---|
| Results article | results of uncompleted trial | 01/02/2006 | Yes | No |
