In-vitro Myometrial Contractility After Oxytocin Pre-exposure in Women With Advanced Maternal Age and Morbid Obesity

February 5, 2018 updated by: Samuel Lunenfeld Research Institute, Mount Sinai Hospital

Women with advanced maternal age and morbid obesity, have a higher incidence of labor induction/ augmentation and cesarean section (CS), and are at a greater risk for postpartum hemorrhage (PPH). Oxytocin is the first line drug in the treatment of PPH, however, oxytocin receptor (OTR) desensitization has been recognized in the context of prolonged labors secondary to either endogenous or exogenous oxytocin exposure. It is unknown if oxytocin desensitization specifically affects contractility in women with advanced maternal age and morbid obesity when compared to younger or normal weight populations. Further it is not known if the higher incidence of PPH seen in these women is due to poor uterine contractility and/or poor response to oxytocin.

The investigators hypothesize that women with advanced maternal age and morbid obesity will exhibit poor myometrial contractility as compared to women that are younger and of normal body habitus, in both oxytocin pre-treated and untreated myometrium.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

In view of the growing concern over the rising incidence of later maternal age and morbid obesity in the obstetric population, scientific evidence on pregnancy outcomes in these patients is timely and important. The investigators' previously validated in-vitro model provides a solid foundation for the study of myometrial contractility under controlled conditions, without any confounders that could be encountered in clinical settings. It is also likely to provide in-depth understanding of the parameters that the investigators feel are responsible for higher incidence of PPH in these patients. The investigators' study will form a basis for future modifications in oxytocin augmentation regimens and pharmacotherapy for control of PPH in these patient populations.

Study Type

Interventional

Enrollment (Actual)

44

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Canada
    • Ontario
      • Toronto, Ontario, Canada, M5G1X5
        • Mount Sinai Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

Female

Description

Inclusion Criteria:

  • patients who give written informed consent
  • patients requiring elective primary or 1st repeat Cesarean section
  • patients with gestational age 37-41 weeks
  • non-labouring patients, not exposed to exogenous oxytocin
  • Cesarean section under spinal anesthetic
  • patients <30 years of age with a normal pre-pregnancy BMI (20 and 24.9 kg/m2)
  • patients ≥40 years of age with a normal pre-pregnancy BMI
  • patients with a BMI≥40 kg/m2 and age <30 years

Exclusion Criteria:

  • patients who refuse to give written informed consent
  • patients who require general anesthesia
  • patients who have had more than one previous uterine surgery/CS
  • patients with placental abnormalities (abruption, accreta, percreta)
  • patients with bleeding disorders
  • presence of any other risk factors for PPH

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
No Intervention: Control
A control sample from each patient (no oxytocin applied) will be measured concurrently with samples treated with varying concentrations of oxytocin.
Experimental: Oxytocin
Samples from each patient will be bathed in a solution containing varying concentrations of oxytocin.
Drug: Oxytocin
Oxytocin, 10-10mol/L to 10-5mol/L
Other Names:
  • pitocin

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Motility index
Time Frame: 6-8 hours
6-8 hours

Secondary Outcome Measures

Outcome Measure
Time Frame
Amplitude of contraction
Time Frame: 6-8 hours
6-8 hours
Integrated area under response curve (AUC)
Time Frame: 6-8 hours
6-8 hours
Frequency of contraction
Time Frame: 6-8 hours
6-8 hours

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Samuel Lunenfeld Research Institute, Mount Sinai Hospital

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

May 1, 2013

Primary Completion (Actual)

June 13, 2017

Study Completion (Actual)

June 13, 2017

Study Registration Dates

First Submitted

May 28, 2013

First Submitted That Met QC Criteria

May 30, 2013

First Posted (Estimate)

May 31, 2013

Study Record Updates

Last Update Posted (Actual)

February 6, 2018

Last Update Submitted That Met QC Criteria

February 5, 2018

Last Verified

February 1, 2018

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 13-04

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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