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We investigated which treatment should be applied if primary cervical ripening with a dinoprostone pessary is unsuccessful. We included 281 women who experienced unsuccessful cervical ripening with a dinoprostone pessary and continued on induction of labour (IOL). Of the 281 women recruited, 177 were given a second dose of dinoprostone; 104 women received a balloon catheter. The second dinoprostone pessary was successful in achieving vaginal delivery in 88 of the 177 (48.6%) women, while the balloon catheter was successful in 42 of the 104 women (40.4%); there was no significant difference between the two treatments with regards to successful vaginal delivery. However, of the women who experienced successful vaginal delivery, the delivery rate in the dinoprostone group was significantly higher than that in the balloon catheter group 12, 24, 36, or 48 h after insertion ( p  = .0094, .0005, .0258, .0483, respectively). The neonatal outcomes, the proportion of maternal infection and postpartum haemorrhage were similar between the two groups.IMPACT STATEMENTWhat is already known on this subject?  Labour induction is a common procedure in obstetrics in a bid to achieve vaginal delivery in China, because vaginal delivery is more beneficial and associated with a better quality of life as compared to a Caesarean delivery. There is consensus relating to the preferred method of IOL after unsuccessful IOL with a dinoprostone pessary.What do the results of this study add?  This is the first study in a Chinese population to compare the dinoprostone pessary and balloon catheter for women with no response to dinoprostone for cervical ripening with a sample size greater than 100. We found that a second dose of dinoprostone can reduce the time from the re-initiation of IOL to vaginal delivery compared with the balloon catheter. Our data also indicated that all other outcomes relating to the mother and infant were similar.What are the implications of these findings for clinical practice and/or future research?  A second dose of dinoprostone is a superior choice for women who experience unsuccessful IOL with dinoprostone to further accelerate vaginal delivery. What is already known on this subject?  Labour induction is a common procedure in obstetrics in a bid to achieve vaginal delivery in China, because vaginal delivery is more beneficial and associated with a better quality of life as compared to a Caesarean delivery. There is consensus relating to the preferred method of IOL after unsuccessful IOL with a dinoprostone pessary. What do the results of this study add?  This is the first study in a Chinese population to compare the dinoprostone pessary and balloon catheter for women with no response to dinoprostone for cervical ripening with a sample size greater than 100. We found that a second dose of dinoprostone can reduce the time from the re-initiation of IOL to vaginal delivery compared with the balloon catheter. Our data also indicated that all other outcomes relating to the mother and infant were similar. What are the implications of these findings for clinical practice and/or future research?  A second dose of dinoprostone is a superior choice for women who experience unsuccessful IOL with dinoprostone to further accelerate vaginal delivery.

The efficacy and safety of second dinoprostone pessary or balloon catheter after unsuccessful primary ripening with dinoprostone pessary