Trial reportImplementation science : IS2021
OASI2: a cluster randomised hybrid evaluation of strategies for sustainable implementation of the Obstetric Anal Sphincter Injury Care Bundle in maternity units in Great Britain.
Trial report in Implementation science : IS, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers, 2 of them syntheses that pooled it.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
10 citing papers in PubMed, 2 syntheses or guidelines pooled it, 17 citations in OpenAlex.
- Caesarean section and anal incontinence in women after obstetric anal sphincter injury: A systematic review and meta-analysis.BJOG : an international journal of obstetrics and gynaecology · 2025Pooled it
- Care bundles for women during pregnancy, labour/birth, and postpartum: a scoping review.HRB open research · 2024Pooled it
- Perineal Trauma and Obstetric Anal Sphincter Injuries (OASIs) in the United Kingdom: National Trends and Practice Changes Over a Decade.International urogynecology journal · 2026Article
- Evaluating the implementation of the Saving Babies Lives Care Bundle Version 2 from service user and healthcare professionals' perspectives: a questionnaire study.BMJ open quality · 2025Article
- A Care Bundle Aiming to Reduce the Risk of Obstetric Anal Sphincter Injury: A Survey of Women's Experiences.BJOG : an international journal of obstetrics and gynaecology · 2025Article
- The use of implementation mapping in healthcare settings: a scoping review.Frontiers in public health · 2025Article
- Commentary on "Obstetric Anal Sphincter Injury Care Bundle: A Quality Improvement Initiative".International urogynecology journal · 2024Article
- Design and management considerations for control groups in hybrid effectiveness-implementation trials: Narrative review & case studies.Frontiers in health services · 2023Review
- Connecting the science and practice of implementation - applying the lens of context to inform study design in implementation research.Frontiers in health services · 2023Article
- A hybrid type I, multi-center randomized controlled trial to study the implementation of a method for Sustained cord circulation And VEntilation (the SAVE-method) of late preterm and term neonates: a study protocol.BMC pregnancy and childbirth · 2022Article
Corrections and comments
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Authors and funding
9 authors at 5 institutions in 1 country.
Funding
Abstract
backgroundThe Obstetric Anal Sphincter Injury (OASI) Care Bundle comprises four primary and secondary prevention practices that target the rising rates of severe perineal tearing during childbirth, which can have severe debilitating consequences for women. The OASI Care Bundle was implemented in 16 maternity units in Britain in the OASI1 project (2017-2018), which demonstrated the care bundle's effectiveness in reducing OASI rates. In OASI2, the care bundle will be scaled up to 20 additional National Health Service (NHS) maternity units in a hybrid effectiveness-implementation study that will examine the effectiveness of strategies used to introduce, implement and sustain the care bundle.
methodsOASI2 is a two-arm cluster-randomised control trial (C-RCT) of maternity units in England, Scotland and Wales, with an additional non-randomised study arm. C-RCT arm 1 (peer support, n = 10 units) will be supported by 'buddy' units to implement the OASI Care Bundle. C-RCT arm 2 (lean implementation, n = 10 units) will implement without external support. The additional study arm (sustainability, n = 10 units) will include some original OASI1 units to evaluate the care bundle's sustainability and OASI rates over time, from before OASI1 and through the end of OASI2. Units in all three study arms will receive an Implementation Toolkit with training resources and implementation support. The C-RCT arms will be compared in terms of OASI rate reduction (primary effectiveness outcome) and clinicians' adoption of the care bundle (primary implementation outcome). Clinical data will be collated from maternity information systems; implementation data will be collected through validated surveys with women and clinicians, supplemented by qualitative methods. Descriptive statistics and regression modelling will be used for analysis. Emergent themes from the qualitative data will be assessed using framework analysis. DISCUSSION: OASI2 will study the impact of various implementation strategies used to introduce and sustain the OASI Care Bundle, and how these strategies affect the bundle's clinical effectiveness. The study will generate insights into how to effectively scale-up and sustain uptake and coverage of similar interventions in maternity units. A locally adaptable 'implementation blueprint' will be produced to inform development of future guidelines to prevent perineal trauma.
trial registrationISRCTN26523605.
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