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Bed Rest With a Short Cervix on Preterm Birth (BEWISE)

3 mai 2026 mis à jour par: Julie Glavind

BEWISE - Bed Rest With a Short Cervix on Preterm Birth

Maternal AR has long been used to prevent PTB. However, definitions of AR vary widely, ranging from complete bed rest to partial limitation of physical activity for one or more hours daily.

The use of maternal AR to prevent preterm birth is largely based on observational evidence linking strenuous physical activity to an increased risk of preterm birth, and the assumption that reduced activity may decrease myometrial activity. However, the existing evidence on the clinical effects of AR remains limited and has not demonstrated a reduction in preterm birth or a delay in deliv-ery. In contrast, some studies suggest a potential increase in preterm birth following AR and instead significant adverse maternal and fetal effects.

The overall aim of this study is to compare gestational age at birth in women with a short cervix who are prescribed AR compared with women with a short cervix who are not prescribed AR (NAR).

The primary hypothesis is that NAR is non-inferior to AR in prolonging pregnancy in women with a short cervix.

Secondary hypotheses are that, compared with AR, NAR is associated with higher level of physical activity, lower risk of maternal depression, and reduced risk of loss of maternal bone mineral density.

Through the BEWISE study, we wish to implement a change in the Danish national clinical practice regarding AR from recommending AR in risk groups (current practice) to no longer recommending AR as part as routine care (new practice). We will evaluate this change in clinical practice by prospectively collecting data from women both before and after implementation of the new recommendation. The transition from AR to NAR will be implemented sequentially in each Danish region using a randomised stepped-wedge (SW) cluster design, with each region constituting a cluster. The order in which regions transition is determined by randomisation. Each region will adopt the new recommendation at 3-month intervals, resulting in full national transition from AR to NAR within 12 months Eligible participants are pregnant women in gestational age 20+0 to 33+6 and cervical length < 25 mm in singleton pregnancies and < 30 mm in multiple pregnancies. Participants must be above 18 years of age and be able to read and understand Danish or English. There are no exclusion criteria.

The primary outcome is gestational age in days (continuous).

Aperçu de l'étude

Statut

Pas encore de recrutement

Les conditions

Intervention / Traitement

Type d'étude

Interventionnel

Inscription (Estimé)

6000

Phase

  • N'est pas applicable

Contacts et emplacements

Cette section fournit les coordonnées de ceux qui mènent l'étude et des informations sur le lieu où cette étude est menée.

Coordonnées de l'étude

Critères de participation

Les chercheurs recherchent des personnes qui correspondent à une certaine description, appelée critères d'éligibilité. Certains exemples de ces critères sont l'état de santé général d'une personne ou des traitements antérieurs.

Critère d'éligibilité

Âges éligibles pour étudier

  • Adulte
  • Adulte plus âgé

Accepte les volontaires sains

Non

La description

Pregnant women with gestational age 20+0 to 33+6

  • Cervical length < 25 mm in singleton pregnancies and < 30 mm in multiple pregnancies
  • Above 18 years of age
  • Reads and understands Danish or English

Plan d'étude

Cette section fournit des détails sur le plan d'étude, y compris la façon dont l'étude est conçue et ce que l'étude mesure.

Comment l'étude est-elle conçue ?

Détails de conception

  • Objectif principal: Traitement
  • Répartition: Randomisé
  • Modèle interventionnel: Affectation séquentielle
  • Masquage: Aucun (étiquette ouverte)

Armes et Interventions

Groupe de participants / Bras
Intervention / Traitement
Comparateur actif: Activity Restriction
The comparison arm reflects current Danish clinical practice in each participating region. According to national recommendations, AR is indicated before GA 28+0, with the level of restriction determined by cervical length and clinical context. In singleton pregnancies with a cervix <10 mm in singleton/<15 mm in twins, strict AR is prescribed, defined as bed rest with only toilet allowance. In addition, thrombosis prophylaxis (Low Molecular Weight Heparin and compression stockings) is initiated in cases of strict AR. In women with a cervix of 10-14 mm in singletons/15-20 mm in twins, or in cases of PPROM with a cervix <25 mm, moderate AR is prescribed, defined as 2-8 hours of daily bed rest. The regimen is continued until 28 weeks of gestation.
Comportemental: Activity Restriction
Recommendation to restrict physical activity in pregnant women with a short cervix. This may include increased rest or bed rest according to local clinical practice.
Autres noms:
  • RA
  • Bed Rest
Expérimental: No Activity Restriction

The intervention consists of a recommendation of NAR during pregnancy. No general or graded restrictions on daily activities are advised, and cervical length is not an indication for activity limitation, in line with current evidence.

The NAR recommendation is supported by a pragmatic clinical guidance. Women are advised to avoid activities that provoke pain, increase uterine contractions, or worsen pelvic pressure. Decisions regarding hospital admission or sick leave are based on individual clinical assessment rather than cervical length.

Specific advice may be provided when clinically indicated. Women are generally advised to avoid heavy weight-bearing exercise and lifting of objects exceeding approximately 10 kg. Otherwise, no specific restrictions on physical activity are imposed, provided that activities do not provoke symptoms such as pain, increased uterine contractions, or pelvic pressure. Sexual activity may be ad-dressed on an individual basis following clinical assessment.
Comportemental: No Activity Restriction
Recommendation to continue normal daily activity in pregnant women with a short cervix, without restricting physical activity.
Autres noms:
  • Activité
  • No Bed Rest
  • NAR

Que mesure l'étude ?

Principaux critères de jugement

Mesure des résultats
Description de la mesure
Délai
Gestational age at birth
Délai: At birth (from inclusion until delivery)
Gestational age at birth measured in completed days of pregnancy. This is calculated based on the estimated due date from ultrasound (crown-rump lenght <14weeks).
At birth (from inclusion until delivery)

Mesures de résultats secondaires

Mesure des résultats
Description de la mesure
Délai
Birth before 37 weeks of gestation
Délai: At birth
At birth
Gestational age at birth, pooled
Délai: At birth (from inclusion until delivery)
  • 14+0-21+6 weeks
  • 22+0-27+6 weeks
  • 28+0-31+6 weeks
  • 32+0-36+6 weeks
  • Birth after 37+0 weeks of gestation
At birth (from inclusion until delivery)
Latency from inclusion to birth (days)
Délai: At birth (from inclusion until delivery)
At birth (from inclusion until delivery)
Onset of birth
Délai: At birth (from inclusion until delivery)
  • Spontaneous
  • Induction
  • Caesarean section
At birth (from inclusion until delivery)
Mode of birth
Délai: At birth (from inclusion until delivery)
  • Vaginal
  • Assisted vaginal
  • Planned caesarean section
  • Non planned caesarean section
At birth (from inclusion until delivery)
- Non-occipital presentation
Délai: At birth (from inclusion until delivery)
At birth (from inclusion until delivery)
Interventions during birth
Délai: At birth (from inclusion until delivery)
  • Oxytocin-infusion
  • Epidural anaesthesia
At birth (from inclusion until delivery)
Degree of birth tear
Délai: At birth (from inclusion until delivery)
  • No tear
  • 1. or 2. degree tear
  • 3. or 4. degree tear
At birth (from inclusion until delivery)
Maternal serious morbidity
Délai: From inclusion to 42 days after delivery
Admission to an intensive care unit or a unit providing 24-hour medical supervision, mechanical ventilation, or continuous vasoactive drug support at any time during pregnancy and postpartum due to pregnancy- or childbirth-related complications
From inclusion to 42 days after delivery
Umbilical cord arterial pH
Délai: At birth (from inclusion until delivery)
At birth (from inclusion until delivery)
EPDS depression score
Délai: From inclusion to 8 weeks after due date
From inclusion to 8 weeks after due date
Bone turnover marker level
Délai: At inclusion and after 4 and 8 weeks.
  • Procollagen type 1 N-propeptide (PINP)
  • Carboxy-terminal telopeptide of type I collagen (CTX)
At inclusion and after 4 and 8 weeks.
Lumbar spine Z-score
Délai: 12 months after stopped breastfeeding
12 months after stopped breastfeeding
Data from SENS activity tracker
Délai: At birth (from inclusion until delivery)
Step count Time in supine position
At birth (from inclusion until delivery)
Neonatal mortality
Délai: At birth (from inclusion until delivery)
At birth (from inclusion until delivery)
Fetal loss
Délai: At birth (from inclusion until delivery)
At birth (from inclusion until delivery)
Birth weight
Délai: At birth (from inclusion until delivery)
At birth (from inclusion until delivery)
Neonatal admission, days
Délai: From inclusion until discharge or 44 postmenstrual weeks
From inclusion until discharge or 44 postmenstrual weeks
CNS morbidity
Délai: From inclusion until discharge or 44 postmenstrual weeks
Intraventricular haemorrhage grade III or IV, Periventricular leukomalacia
From inclusion until discharge or 44 postmenstrual weeks
Gastrointestinal morbidity
Délai: From inclusion until discharge or 44 postmenstrual weeks
Necrotizing enterocolitis (NEC) requiring surgery (Bell's stage 3), Spontaneous intestinal perfo-ration (SIP) requiring surgical treatment
From inclusion until discharge or 44 postmenstrual weeks
Respiratory support
Délai: From inclusion until discharge or 44 postmenstrual weeks
Mechanical ventilation or non-invasive ventilation (NIV)
From inclusion until discharge or 44 postmenstrual weeks
Respiratory distress syndrome (RDS)
Délai: From inclusion until discharge or 44 postmenstrual weeks
From inclusion until discharge or 44 postmenstrual weeks
Early onset infection
Délai: From inclusion to 5 days after birth
Definition: >5 days of i.v. antibiotics where the treatment starts within the first week after delivery.
From inclusion to 5 days after birth
Apgar score at 5 minutes
Délai: At birth (from inclusion until delivery)
At birth (from inclusion until delivery)

Collaborateurs et enquêteurs

C'est ici que vous trouverez les personnes et les organisations impliquées dans cette étude.

Parrainer

Julie Glavind

Collaborateurs

Odense University Hospital
Zealand University Hospital
Aarhus University Hospital
Rigshospitalet, Denmark
Aalborg University Hospital
University of Aberdeen

Les enquêteurs

  • Chercheur principal: Julie Glavind, Senior Consultant, MD, PhD, Aarhus Univeristy Hospital, Department of Obstetrics and Gynecology

Dates d'enregistrement des études

Ces dates suivent la progression des dossiers d'étude et des soumissions de résultats sommaires à ClinicalTrials.gov. Les dossiers d'étude et les résultats rapportés sont examinés par la Bibliothèque nationale de médecine (NLM) pour s'assurer qu'ils répondent à des normes de contrôle de qualité spécifiques avant d'être publiés sur le site Web public.

Dates principales de l'étude

Début de l'étude (Estimé)

1 mai 2026

Achèvement primaire (Estimé)

1 février 2029

Achèvement de l'étude (Estimé)

1 mai 2029

Dates d'inscription aux études

Première soumission

3 mai 2026

Première soumission répondant aux critères de contrôle qualité

3 mai 2026

Première publication (Réel)

11 mai 2026

Mises à jour des dossiers d'étude

Dernière mise à jour publiée (Réel)

11 mai 2026

Dernière mise à jour soumise répondant aux critères de contrôle qualité

3 mai 2026

Dernière vérification

1 mai 2026

Plus d'information

Termes liés à cette étude

Termes MeSH pertinents supplémentaires

Autres numéros d'identification d'étude

  • 16-0500-15
  • 4308-00216B (Autre subvention/numéro de financement: Independent Research Fund Denmark)
  • 1-10-72-96-25 (Autre identifiant: De Videnskabsetiske Komitéer For Region Midtjylland)

Plan pour les données individuelles des participants (IPD)

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INDÉCIS

Description du régime IPD

IPD will be shared if possible according to GDPR and Danish legislation

Informations sur les médicaments et les dispositifs, documents d'étude

Étudie un produit pharmaceutique réglementé par la FDA américaine

Non

Étudie un produit d'appareil réglementé par la FDA américaine

Non

Ces informations ont été extraites directement du site Web clinicaltrials.gov sans aucune modification. Si vous avez des demandes de modification, de suppression ou de mise à jour des détails de votre étude, veuillez contacter register@clinicaltrials.gov. Dès qu'un changement est mis en œuvre sur clinicaltrials.gov, il sera également mis à jour automatiquement sur notre site Web .

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