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NCT Number: NCT01865669

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

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.

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Key information

Conditions

Postpartum Hemorrhage Female Urogenital Diseases and Pregnancy Complications Hemorrhage Obstetric Labor Complications Pathologic Processes Pathological Conditions, Signs and Symptoms Pregnancy Complications Puerperal Disorders Urogenital Diseases Uterine Hemorrhage

Sex eligibility

Female

Study type

Interventional

Phase

Not applicable

Primary location

Mount Sinai Hospital

Toronto, Ontario, M5G1X5, Canada

About this study

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.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

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

Treatment and study plan

Oxytocin

Drug

Oxytocin, 10-10mol/L to 10-5mol/L

Other names: pitocin

Primary outcomes

  1. Motility index

    Time frame: 6-8 hours

Secondary outcomes

  1. Amplitude of contraction

    Time frame: 6-8 hours

  2. Integrated area under response curve (AUC)

    Time frame: 6-8 hours

  3. Frequency of contraction

    Time frame: 6-8 hours

Sponsors and collaborators

Lead sponsor

Samuel Lunenfeld Research Institute, Mount Sinai Hospital

Other

Registry information

Important dates

Study start
2013
Primary completion
2017
Study completion
2017
First posted
May 31, 2013
Registry last updated
Feb 6, 2018

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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