A 15,000-woman trial across eight countries is tracking which surgical techniques for caesarean section cause the fewest complications three years after the operation. Caesarean section is one of the world’s most common operations, yet surgeons lack clear evidence on basic choices—whether to close the womb with one layer of stitches or two, whether to repair the cut inside or outside the pelvis, and which suture material causes less scarring. The original CORONIS trial compared five pairs of surgical steps in 15,000 women across Argentina, Chile, Ghana, India, Kenya, Pakistan, Sudan, and South Africa. This follow-up now assesses the longer-term consequences of those different techniques. If the results show clear winners among the five approaches, hospitals in low-resource settings could adopt safer, cheaper standard procedures without expensive equipment. For example, avoiding unnecessary closure of the peritoneum—the thin membrane covering abdominal organs—could reduce operating time and infection risk. The findings would directly inform surgical guidelines for the millions of women who undergo caesarean sections each year in developing countries, where follow-up care is often limited and complications can have lifelong consequences.
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Caesarean section is one of the commonest operations undertaken worldwide and yet despite the number of caesarean sections being performed and the impact of this operation on the short and long term health of women, we know very little about which approaches to doing the caesarean section are associated with the lowest risk of complications. The CORONIS trial will compare five aspects of the surgical procedures used at the time of caesarean section in 15,000 women to see which of these aspects is associated with the lowest risk of complications. The five pairs of procedures to be compared are: (a) two different approaches to opening the abdominal wall (?blunt? versus ?sharp?); (b) whether the cut on the womb is repaired while the womb is kept inside the womans pelvis or whether it is repaired outside (extra-abdominal versus intra-abdominal repair of the uterine incision); (c) whether the cut on the womb is closed in one layer of stitches or two (single versus double layer closure of the uterus); (d) whether the peritoneum, which is a thin membrane which covers all the organs inside the abdomen, letting them slide over each other easily, (closure versus non-closure of the pelvic and parietal peritoneum); (e) which of two different types of stitch material should be used for closing the womb (Vicryl versus catgut sutures for closure of the uterus and rectus sheath). This follow-up study will allow us to assess the consequences of the different techniques used at 3 years after the original operation.
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