Skip to main content

Background to OASI2

Between 2017 and 2018, the OASI Care Bundle Project was rolled out in 16 maternity units in England, Scotland and Wales.

The project was led by the RCOG and the RCM, and was undertaken in response to evidence of rising rates of obstetric anal sphincter injuries (OASI) in England.

The care bundle consisted of 4 evidence-based interventions that were likely to result in better outcomes when used together than when used on their own.

The project team created an implementation guide to accompany the care bundle, alongside a multidisciplinary skills development module for health care professionals and campaign materials.

The project team analysed 55,060 births across the 16 participating maternity units during the study, and found that use of the care bundle led to an overall decrease in OASI rates from 3.3% to 3.0% which, when adjusting for women’s characteristics and time factors, amounted to a 20% reduction in women’s risk of sustaining an OASI.

Furthermore, use of the care bundle was shown to have no effect on episiotomy and caesarean section rates.

You can read the full results of the project evaluation and find out more about the study by visiting the OASI Care Bundle webpage.