Emergency Cerclage in Twin Pregnancies at Imminent Risk of Preterm Birth: an Open-Label Randomised Controlled Trial (ENCIRCLE)

St George's, University of London

Status

Unknown

Conditions

Twin Pregnancy With Antenatal Problem

Twin to Twin Transfusion Syndrome

Preterm Birth

Treatments

Procedure: Insertion of cervical cerclage

Study type

Interventional

Funder types

Other

Identifiers

NCT03818867

17.004

Details and patient eligibility

About

Twin pregnancies are at an increased risk of early delivery. One of the reasons for this may be due to a weakened neck of the womb (cervix). There are 2 main ways to manage a weakened cervix in pregnancy. One option is to do nothing (conservative approach). The other is to strengthen the cervix with a stitch (cerclage) to provide extra support. There is no good quality convincing evidence to suggest which of these has better outcomes for mum and babies in twin pregnancies. This trial aims to determine whether securing the weakened cervix with a cerclage will help to prolong the pregnancy and prevent early delivery. Babies who are born early experience multiple complications including lung, brain and learning difficulties. Therefore, the study will also aim to determine whether prolonging the pregnancy by inserting the cerclage reduces the number of babies affected by these problems. In order to carry out a fair study we aim to perform what is known as a randomised controlled trial. We will include in the trial two major groups: (1) women pregnant with twins, who present with a weakened cervix and no signs of infection between 14 and 26 weeks of pregnancy. This will be diagnosed on an internal examination or ultrasound scan, and (2) women pregnant with identical twins complicated by twin-to-twin transfusion syndrome (TTTS) treated by Laser surgery between 16 and 26 weeks in whom a short cervix (<15mm) is identified. TTTS is rare but potentially devastating condition which occurs in about 10-15% of identical twin pregnancies. If left untreated, 80-90% of these babies will die. Overall, best first-line treatment of TTTS is laser surgery. Cervical length is a strong predictor of preterm delivery in these pregnancies.

Participants will be allocated randomly into the intervention (cerclage) or control (conservative) group. The procedure to insert the cerclage will be performed under an anaesthetic to minimise discomfort and you will be admitted for 2-3 days following the operation to ensure there are no complications or signs of labour. Women in both groups will be followed up in the same manner until they deliver and the pregnancy outcomes will be compared between the 2 groups to determine which management option is best.

Full description

The study hypothesis is that the placement of an emergency cervical cerclage prolongs the pregnancy in (1) twin pregnancies with a dilated internal cervical os between 14+0 and 26+0 weeks, and (2) in monochorionic twin pregnancies complicated by TTTS treated by Laser surgery between 16+0 and 26+0 weeks' gestation in whom a short cervix (<15mm) is identified.

Study Design: Randomised controlled trial

Study population:

2 groups

Twin pregnancies between 14 - 26 weeks' gestation presenting with an open cervix
Monochorionic twin pregnancies complicated by twin-to-twin transfusion syndrome (TTTS) treated by Laser surgery between 16+0 and 26+0 weeks' gestation in whom a short cervix (<15mm) is identified

The primary outcome is time to delivery (from randomisation to birth). Secondary outcomes include gestation at delivery, preterm birth before 28, 32 and 34 weeks' gestation, birthweight, stillbirth, neonatal death, survival to discharge, days of admission to the neonatal intensive care unit, composite outcome of stillbirth, neonatal death, intraventricular haemorrhage, periventricular leukomalacia, respiratory distress syndrome, bronchopulmonary dysplasia, retinopathy of prematurity, necrotising entercolitis, proven neonatal sepsis, or the need for ventilation, days of maternal admission for preterm labour and maternal morbidity.

Enrollment

31 estimated patients

Sex

Female

Ages

18+ years old

Volunteers

No Healthy Volunteers

Inclusion criteria

Twin pregnancies presenting with an open cervix between 14 and 26 weeks of gestation, OR
Twin pregnancies complicated by TTTS treated by Laser surgery between 16+0 and 26+0 weeks' gestation in whom a short cervix (<15mm) is identified.
Age >18 years
Informed consent

Exclusion criteria

Cervical dilatation ≥5cm
Amniotic membranes prolapsed beyond external os into the vagina, unable to visualise cervical tissue
Preterm premature rupture of the membranes (PPROM) at the time of diagnosis of dilated cervix
Major fetal malformations unrelated to TTTS
Intrauterine death of one or both fetuses
Symptoms or signs of threatened imminent delivery, e.g. painful regular uterine contractions, active vaginal bleeding, history of ruptured membranes
Suspected chorioamnionitis [based on maternal uterine tenderness, a temperature of 38°C or greater, significant leucocytosis (>15,000 x 106/L) or elevated C-reactive protein (>15 mg/L), or maternal tachycardia].
Placenta praevia
Monochorionic monoamniotic twin pregnancies
Prophylactic cervical cerclage
Women who are not able to give valid consent, e.g. unconscious or severely ill
Mental health disorder which impairs the ability to give fully informed consent
Women under the age of 18 years
Higher order multiple pregnancies