Oxytocin Receptor Expression in Pregnancy
- Conditions
- Post-AbortionHemorrhage, Obstetric
- Interventions
- Other: Myometrial tissue sample collection
- Registration Number
- NCT03907735
- Lead Sponsor
- Oregon Health and Science University
- Brief Summary
This study aims to determine when during gestation oxytocin receptor (OXTR) expression increases in the myometrium, which will contribute new insight to the management of obstetric hemorrhage and our understanding of normal and abnormal labor.
- Detailed Description
In this descriptive study, we will obtain myometrial tissue samples by core needle biopsy under ultrasound guidance in anesthetized women immediately following surgical abortion and from controls, all of whom are undergoing a separate planned obstetric/gynecologic surgery. Tissue studies will be performed on these biopsy samples to examine oxytocin receptor expression and function.
Recruitment & Eligibility
- Status
- ACTIVE_NOT_RECRUITING
- Sex
- Female
- Target Recruitment
- 30
- Women age 18-50
- Gestational age 14-26 weeks; or 6-13 weeks, 37-42 weeks, or non-pregnant (controls)
- Undergoing another planned surgical procedure with anesthesia (suction D&C, D&E, gravid hysterectomy, cesarean section, or laparoscopic tubal ligation)
- Able to give informed consent in English or Spanish
To optimize biopsy safety, we will exclude patients with anticipated difficult cases, that have additional risks of hemorrhage, or those with features that limit ultrasound visualization.
Increased risk of hemorrhage:
- Anemia (Hgb < 9)
- Anticoagulation, bleeding disorder, or coagulopathy
- Multiple gestation
- Infection or sepsis
For ultrasound-guided procedures:
- Obese, BMI ≥ 40
- History of ≥2 cesarean sections
- Large fibroids or uterine anomalies obstructing view
- Other poor visualization
- Thin myometrium < 1cm
Study & Design
- Study Type
- OBSERVATIONAL
- Study Design
- Not specified
- Arm && Interventions
Group Intervention Description 2nd trimester Myometrial tissue sample collection Second trimester myometrial tissue samples will be collected by core needle biopsy under ultrasound guidance in anesthetized women. Samples will be obtained primarily after second trimester surgical abortions or Dilation and Evacuation (D\&E) procedures as well as after rare gravid hysterectomies or after late second trimester cesarean deliveries. 1st trimester Myometrial tissue sample collection First trimester myometrial tissue samples will be collected by core needle biopsy under ultrasound guidance in anesthetized women. Samples will be obtained after first trimester surgical abortions or suction dilation and curettage (D\&C). Non-pregnant Myometrial tissue sample collection Myometrial tissue samples will be collected by core needle biopsy under ultrasound guidance in non-pregnant women undergoing gynecologic surgery under anesthesia for laparoscopic tubal ligation. After term pregnancy (3rd trimester) Myometrial tissue sample collection Third trimester myometrial tissue samples will be collected by core needle biopsy under ultrasound guidance in anesthetized women. Samples will be obtained at the time of cesarean delivery.
- Primary Outcome Measures
Name Time Method Oxytocin receptor expression 30 minutes Measure of oxytocin receptor expression. Perform quantitative RT-PCR on mRNA extracted from biopsy samples obtained from subjects at the end of their procedure (within 30 minutes).
- Secondary Outcome Measures
Name Time Method Function of myometrial oxytocin receptor 30 minutes Assessment of the function of the myometrial oxytocin receptor. Measure intracellular calcium in cultured myometrial cells after activating the receptor with oxytocin from biopsy samples obtained from subjects at the end of their procedure (within 30 minutes).
Trial Locations
- Locations (1)
Oregon Health & Science University
🇺🇸Portland, Oregon, United States