註釋 Problem statement and BackgroundInduction of Labour occurs in up to 20% of pregnancies in UK1, and Double Balloon Catheter (DBC) is used commonly in this setting. DBC is associated with lower risk of uterine tachysystole when compared with prostaglandins2,3. Certain conditions increase the likelihood of uterine tachysystole, such as hypertension4, but are there risk factors that make tachysystole more likely to happen when DBC is used? We couldnu2019t find an answer for this question in the literature.Case PresentationWe are presenting the case of a 31-year-old primigravida lady, who had a history of CIN1 and HPV in 2014 and was conservatively managed. She got pregnant in 2018 and had an uneventful pregnancy until gestational age 38 weeks+5 days, when she developed mild preeclampsia, and had induction for labour using DBC. She developed uterine tachysystole four hours after DBC insertion, and so it was removed. Subsequently, she had two different preparations of dinoprostone, artificial rupture of membranes and oxytocin infusion without uterine overactivity and delivered vaginally thereafter.Discussion and ConclusionsThe patient had uterine overactivity with DBC, and such tachysystole didnu2019t happen when prostaglandin E2 and oxytocin infusion were used. This is interesting, because in one study oxytocin was found to increase risk of tachysystole by 2- to 3- fold4.We believe this should prompt further research into the risk factors of uterine tachysystole in women receiving DBC.Patient has given her informed consent to publish her case.No conflicts of interest have been identified.References1.National Institute for Health and Care Excellence Interventional procedures guidance (IPG528). Insertion of a double balloon catheter for induction of labour in pregnant women without previous caesarean section. July 20152.Chodankar R, Sood A, Gupta J. An overview of the past, current and future trends for cervical ripening in induction of labour. TOG The Obstetrician Gynecologist 2017;19(3):219-226.3.Levine EM ed, van Zuuren EJ ed, Ehrlich A ed. Cervical ripening for labor induction with unfavourable cervix. Dynamed Plus.2019 http://www.dynamed.com/topics/dmp~AN~T922499/Cervical-ripening-for-labor-induction-with-unfavorable-cervix#GUID-2CEC200C-E566-450C-A3C8-ECEFD5C22414--GENREF5419.4.Heuser CC, Knight S, Sean Esplin M et al. Tachysystole in term labor: incidence, risk factors, outcomes, and effect on fetal heart tracings. AJOG 2013;209(1):32-33. 