CORONIS - International study of caesarean section surgical techniques: The follow-up study

Edgardo Abalos, Enrique Oyarzun, Victor Addo, J. B. Sharma, Jiji Matthews, James Oyieke, Shabeen Naz Masood, Mohamed A. El Sheikh, Peter Brocklehurst*, Barbara Farrell, Shan Gray, Pollyanna Hardy, Nina Jamieson, Ed Juszczak, Patsy Spark

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Background: The CORONIS Trial was a 2×2×2×2×2 non-regular, fractional, factorial trial of five pairs of alternative caesarean section surgical techniques on a range of short-term outcomes, the primary outcome being a composite of maternal death or infectious morbidity. The consequences of different surgical techniques on longer term outcomes have not been well assessed in previous studies. Such outcomes include those related to subsequent pregnancy: mode of delivery; abnormal placentation (e.g. accreta); postpartum hysterectomy, as well as longer term pelvic problems: pain, urinary problems, infertility. The Coronis Follow-up Study aims to measure and compare the incidence of these outcomes between the randomised groups at around three years after women participated in the CORONIS Trial.Methods/Design: This study will assess the following null hypotheses: In women who underwent delivery by caesarean section, no differences will be detected with respect to a range of long-term outcomes when comparing the following five pairs of alternative surgical techniques evaluated in the CORONIS Trial:. 1. Blunt versus sharp abdominal entry. 2. Exteriorisation of the uterus for repair versus intra-abdominal repair. 3. Single versus double layer closure of the uterus. 4. Closure versus non-closure of the peritoneum (pelvic and parietal). 5. Chromic catgut versus Polyglactin-910 for uterine repair. The outcomes will include (1) women's health: pelvic pain; dysmenorrhoea; deep dyspareunia; urinary symptoms; laparoscopy; hysterectomy; tubal/ovarian surgery; abdominal hernias; bowel obstruction; infertility; death. (2) Outcomes of subsequent pregnancies: inter-pregnancy interval; pregnancy outcome; gestation at delivery; mode of delivery; pregnancy complications; surgery during or following delivery.Discussion: The results of this follow-up study will have importance for all pregnant women and for health professionals who provide care for pregnant women. Although the results will have been collected in seven countries with limited health care resources (Argentina, Chile, Ghana, India, Kenya, Pakistan, Sudan) any differences in outcomes associated with different surgical techniques are likely to be generalisable throughout the world.Trial registration: ISRCTN31089967.

Original languageEnglish
Article number215
JournalBMC Pregnancy and Childbirth
StatePublished - 21 Nov 2013
Externally publishedYes

Bibliographical note

Funding Information:
The study has been approved and is funded by the UK Medical Research Council and the UK Department for International Development. The CORONIS Collaborative Group Writing Committee Dr Edgardo Abalos, Centro Rosarino de Estudios Perinatales, Rosario, Argentina Professor Enrique Oyarzun, Pontifica Universidad Católica de Chile Hospital, Santiago, Chile Dr Victor Addo, Komfo Anokye Teaching Hospital, Kumasi, Ghana Dr JB Sharma, All India Institute of Medical Sciences, Delhi, India Dr Jiji Matthews, Christian Medical College and Hospital, Vellore, India Professor James Oyieke, Kenyatta National Hospital, University of Nairobi, Kenya Dr Shabeen Naz Masood, Fatima Bai Hospital, Karachi, Pakistan Professor Mohamed A El Sheikh, Soba University Hospital, University of Khartoum, Sudan Peter Brocklehurst, The Institute for Women’s Health, London and National Perinatal Epidemiology Unit CTU, Oxford Barbara Farrell, National Perinatal Epidemiology Unit CTU, Oxford Shan Gray, National Perinatal Epidemiology Unit CTU, Oxford Pollyanna Hardy, National Perinatal Epidemiology Unit CTU, Oxford Nina Jamieson, National Perinatal Epidemiology Unit CTU, Oxford Ed Juszczak, National Perinatal Epidemiology Unit CTU, Oxford Patsy Spark, National Perinatal Epidemiology Unit CTU, Oxford


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