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Foley Bulb Traction for Cervical Ripening

2014-08-27 03:19:23 | BioPortfolio

Summary

This study aims to determine what type of traction, weighted bag or inner thigh taping, on foley catheters for cervical ripening results in a greater cervical dilation and shorter length of labor.

The primary outcomes are post-ripening dilation of 3 cm or more and time to delivery.

The secondary outcomes are patient pain/comfort rating and method of delivery. The investigators hypothesize that the use a weighted bag will result in a 20% increase in post-ripening dilation of at least 3 cm and a shorter average length of labor.

Description

Over the last 20 years the number of induced labors doubled so that over one in five births in 2003 was induced. In response to the rising need for cervical ripening the American College Obstetricians and Gynecologists have stated that both mechanical and prostaglandin ripening is acceptable and safe.

Prior to beginning an induction, the Bishop score (cervical dilation, effacement, station, consistency, and position) is assessed. With Bishop scores less than five, a cervical ripening agent is commonly used. The mechanical dilation with a foley catheter works by both a direct stretching of the lower uterine segment and cervix and a local inflammatory response that releases matrix metalloproteinases and prostaglandins. It is often chosen due to its lower cost, low incidence of systemic side effects, and low risk of hyperstimulation.

Compared to misoprostol a foley with oxytocin was more effective at induction in primiparous patients, more effective at improving the dilation, safe to use after misoprostol, and not associated with an increased risk of uterine rupture in a VBAC. The foley was also shown to have a shorter induction time and less contractile abnormalities than prostaglandin E2 gel and no increased rate of uterine rupture in VBAC attempts. The use of extra-amniotic saline infusion with a foley catheter has been used to augment the mechanical stretching, however this did not decrease the induction time or improve the outcomes. Finally, a Cochrane Database review found that mechanical methods of cervical ripening were equally effective as prostaglandin agents.

Although the safety, efficacy, and side effects of foley catheter ripening have been compared with multiple other methods for cervical ripening, very few studies have compared different protocols for foley placement. One study showed that the use of oxytocin while the foley catheter was in place did not significantly shorten the time to delivery. Levy et al showed that a larger, 80 ml, balloon resulted in a greater post-ripening dilation and a higher number of deliveries in 24hours. No study to date has examined how the traction placed on the foley catheter affects the outcome.

Therefore, we propose doing a randomized controlled study in which the control is the current standard of care at MetroHealth Medical Center of placing a 500cc weight on the foley and placing it to gravity over the end of the bed. The comparison will be the method used at many institutions where the foley catheter is placed on gentle traction and taped to the inner thigh of the patient.

The primary outcomes measured will be a post-ripening dilation of 3cm or more and time to delivery. The secondary outcomes are patient pain/comfort rating and method of delivery.

Study Design

Allocation: Randomized, Control: Active Control, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Treatment

Conditions

Cervical Ripening

Intervention

weighted bag, leg taping

Location

MetroHealth Medical Center
Cleveland
Ohio
United States
44102

Status

Not yet recruiting

Source

MetroHealth Medical Center

Results (where available)

View Results

Links

Published on BioPortfolio: 2014-08-27T03:19:23-0400

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PubMed Articles [2314 Associated PubMed Articles listed on BioPortfolio]

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Medical and Biotech [MESH] Definitions

A change in the CERVIX UTERI with respect to its readiness to relax. The cervix normally becomes softer, more flexible, more distensible, and shorter in the final weeks of PREGNANCY. These cervical changes can also be chemically induced (LABOR, INDUCED).

A network of nerve fibers originating in the upper four cervical spinal cord segments. The cervical plexus distributes cutaneous nerves to parts of the neck, shoulders, and back of the head, and motor fibers to muscles of the cervical spinal column, infrahyoid muscles, and the diaphragm.

A parameter usually used in PRENATAL ULTRASONOGRAPHY to measure the length of the uterine neck (CERVIX UTERI). Cervical length or its shortening is used to identify and prevent early cervical opening and PRETERM BIRTH.

The first cervical vertebra.

The segment of the spinal cord within the CERVICAL VERTEBRAE.

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