Characteristics of pregnant women associated with successful induction of labor by Oxytocin

Abstract

Abstract

Background: American College of Obstetricians and Gynecologists (ACOG) recommends induction of labor in post-term pregnancy by using multiple methods such as amniotomy,  Prostaglandins (Dinoprostone / Misoprostol) or Oxytocin. It depend on the characteristics of pregnant women, gestational age and readiness of the cervix.^(1-3)  The study of the characteristics of pregnant women associated with successful induction of labor by Oxytocin will be useful in choosing suitable method for post-term pregnancy induction.

Objectives: to identify characteristics of pregnant women associated with successful induction of labor by Oxytocin.

Methods: Retrospective cross-sectional design was conducted in Phayao hospital among 76 post-term pregnant women who had induction of labor by Oxytocin from January 1^st 2016 to June 30^th 2018. Demographic data, Clinical data of pregnant women were collected and analyzed by Student’s t-test, Exact probability test and Logistic regression test.

Results: In this study, 40 (52.6%) pregnant women had successful induction by oxytocin and 36 (47.4%) pregnant women had failure induction by oxytocin.  Pregnant women who were gravidity >1 or Bishop score > 7 significantly increase 5.4, 39.76 times of successful induction by oxytocin.

Conclusions: Characteristics of pregnant women that significantly increase the success induction by Oxytocin are gravidity >1 or Bishop score > 7. Pregnant women who have Bishop score < 7 should ripening cervix before using Oxytocin or consider other delivery methods.

Keywords: Bishop score, Oxytocin, Induction, Post term pregnancy, Gravidity