Prolonged Labor Clinical Trial
Official title:
Use of Hyoscine Butyl Bromide for Management of Prolonged Labor in Nulliparous Women, A Randomized Controlled Trial
To determine the value of using Hyoscine as an antispasmodic drug for the management of prolonged labor in nulliparous women at term.
Management of prolonged labor represents a challenging area in the daily obstetric practice.
In 1993, Handa and Laros defined the arrest of active phase of labor, as failure of labor
progress for 2 hours or more, and in 1994, WHO has proposed labor management partograph in
which protraction is defined as < 1cm/hour cervical dilatation for a minimum of 4 hours.
Prolong labor increase the risks of maternal exhaustion, postpartum hemorrhage, sepsis,
fetal distress and admission to the neonatal intensive care unit. The treatment of prolonged
labor is highly desirable goal of intrapartum care, both from prospective of maternal and
fetal wellbeing and for the provider of the birth services. Management of prolonged labor
entails shorter exposure to pain, anxiety, and stress, and would thus translate into a major
improvement in maternal satisfaction with child birth experience.
Several methods have been used for management of prolonged labor including amniotomy and
oxytocin. Amniotomy can cause infection, and can be combined with oxytocin for better
results while oxytocin can cause uterine hyper stimulation, water intoxication, vomiting,
diarrhea, fetal distress, and neonatal jaundice.
Use of antispasmodics for reducing the duration of labor was first described in 1937 by
Hirsch, who reported a decrease in labor length by two to four hours following intrapartum
administration of an antispasmodic like drug (Syntropan®), mainly among older nulliparous,
this was followed by many studies that investigated the role of antispasmodics in prevention
of prolonged labor, however none of the these studies assessed the value of the
antispasmodic for the treatment of prolonged labor; a recent Cochrane review advised that a
rigorously designed well conducted randomized controlled trial with a large sample size
would be beneficial to answer the question.
Hyoscine butyl bromide is spasmolytic drug that act by competitive antagonism to acetyl
choline at post ganglionic parasympathetic nerve ending. It is claimed to reduce duration of
labor by accelerating cervical dilatation without major side effects. It reduces the spasm
of the smooth muscles. Although the efficacy of Hyoscine has been proven in various studies
there is no clear evidence to recommend their routine use in management of prolonged labor.
The objective of the current study is to determine the use of Hyoscine as an antispasmodic
drug for the management of prolonged labor in nulliparous women at term, managed according
to a standard intrapartum protocol.
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