National survey of uterine rupture in Japan: Annual report of Perinatology Committee, Japan Society of Obstetrics and Gynecology, 2018

Aim: To clarify the frequency of occurrence of uterine rupture and its prognosis, a nationwide survey was performed. Methods: Cases of uterine rupture recorded for a period of 5 years were included. Results: There were 152 cases of uterine rupture with an incidence rate of 0.015%. The scarred uterine rupture cases were found to have a significantly earlier occurrence of uterine ruptures in comparison to the unscarred cases: unscarred 39.0 weeks, cesarean section 37.0 weeks, myomectomy 32 weeks and adenomyomectomy 30–32 weeks. And it became apparent that the frequency of hysterectomy, cerebral palsy and neonatal death were higher in the cases of uterine rupture during labor than before delivery. Among the cases of scarred uterine rupture, neonatal prognosis was poorer in cases of pregnancy after myomectomy or adenomyomectomy in comparison with postcesarean section cases. Conclusion: This survey revealed the current incidence of uterine rupture in Japan.