Early Versus Delayed Oxytocin Infusion Following Amniotomy in Nulliparous Women

Study Overview
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Brief Summary
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In UKM Medical Centre (UKMMC), delayed oxytocin augmentation at two hours following amniotomy is the routine obstetric practice in spontaneous or induced labour with intact membranes. This practice may potentially cause prolonged labour, extended labour room occupancy and increased maternal exhaustion while no additional benefit can be gained. On the other hand, recommendation for early oxytocin augmentation poses a dilemma as the effectiveness and safety of this practice are still in doubt. Given this background, the aim of this study was to compare the effect of early versus delay oxytocin infusion in achieving successful vaginal delivery among the low-risk nulliparous women in UKMMC. Besides, this study also compares the adverse maternal and neonatal outcomes between the two practices.

Detailed Description
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This was a randomised controlled trial undertaken in the labour room of UKMMC for a period of eighteen months from August 2014 until February 2016. Eligible women who were admitted in spontaneous labour or for induction of labour were recruited. For women who underwent induction of labour, an interval of at least six hours following vaginal prostaglandin before recruitment was mandatory to avoid overlapping effect of prostaglandin and oxytocin. Upon enrolment, each patient was given a study explanation and written consent was obtained. The randomisation sequence, either to the early oxytocin group or the delayed oxytocin group, was generated using the computer randomisation program in block of two. Allocation to either arm of treatment was determined by the sequential opening of sealed numbered envelopes. In the first arm of early oxytocin group, labour augmentation with oxytocin was started early following artificial ruptured of membrane(ARM). In the second arm of delayed oxytocin group, oxytocin augmentation was delayed at two hours after ARM and this practice is currently being used as standard protocol in this hospital to manage women in labour. In both arms,the infusion rate was doubled every 30 minutes to a maximum of 48 mL/h or until four to five moderate contractions per 10 minutes were achieved at which point the infusion rate was maintained. Continuous fetal heart rate monitoring was maintained throughout the intrapartum period. Vaginal examination was performed at four hours after ARM as well as when clinically indicated ie. abnormal cardiotocography (CTG) and maternal desire to bear down. In the presence of abnormal CTG, either fetal blood sampling or expedited delivery was undertaken as per decided by the obstetrician in charge.

Official Title
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Amniotomy and Early Oxytocin Infusion Versus Amniotomy and Delayed Oxytocin Infusion in Nulliparous Women: a Randomised Controlled Trial

Conditions
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Delivery Delayed, Mode of Delivery, Post Partum Hemorrhage, Uterine Hyperstimulation

Intervention / Treatment
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* Other: duration of initiation of oxytocin


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: gestational age between 36+0 to 41+6 weeks singleton pregnancies in cephalic presentation estimated fetal weight between 2.5 - 4.0 kg cervical dilatation of 4 cm with intact membranes normal fetal heart rate trace before artificial rupture of membranes Exclusion Criteria: Women with significant medical (eg. heart disease, pre-eclampsia, diabetes with high dose insulin, retroviral disease) fetal abnormality (eg. fetal growth restriction or small for gestational age < 2.5 kg, suspected macrosomia > 4.0 kg, fetal anomaly)

Ages Eligible for Study
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Minimum Age: 19 Years
Maximum Age: 45 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Early oxytocin Infusion<br>labour augmentation with oxytocin was started early following amniotomy. | Other: duration of initiation of oxytocin<br>* mode of delivery<br>|
| Active Comparator: Late oxytocin infusion<br>oxytocin augmentation was delayed at two hours after amniotomny and this practice is currently being used as standard protocol in this hospital to manage women in labour. | Other: duration of initiation of oxytocin<br>* mode of delivery<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Achieving vaginal delivery | number of normal vaginal delivery | through study completion, an average of 18 months | 
| Neonatal outcome | Apgar score | through study completion, an average of 18 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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primigravida, amniotomy,, immediate oxytocin, delayed oxytocin