Recovery of Oxytocin Responsiveness in Pregnant Human Myometrial Explants After Oxytocin-Induced Desensitization: an In-vitro Analysis of Oxytocin Receptor Expression and Signaling
Postpartum Hemorrhage
About this trial
This is an interventional treatment trial for Postpartum Hemorrhage focused on measuring Uterine contraction, Oxytocin desensitization
Eligibility Criteria
Inclusion Criteria:
- Patients who give written consent to participate in this study
- Patients with gestational age 37-41 weeks
- Non-laboring patients, not exposed to exogenous oxytocin
- Patients requiring primary Cesarean delivery or first repeat Cesarean delivery
Exclusion Criteria:
- Patients who refuse to give written informed consent
- Patients who require general anesthesia
- Patients who had previous uterine surgery or more than one previous Cesarean delivery
- Patients with any condition predisposing to uterine atony and postpartum hemorrhage, such as abnormal placentation, multiple gestation, preeclampsia, macrosomia, polyhydramnios, uterine fibroids, bleeding diathesis, chorioamnionitis, or a previous history of postpartum bleeding
- Emergency Cesarean section in labor
- Patients on medications that could affect myometrial contractility, such as nifedipine, labetolol or magnesium sulphate.
Sites / Locations
- Mount Sinai HospitalRecruiting
Arms of the Study
Arm 1
Arm 2
Arm 3
Arm 4
Arm 5
Arm 6
Arm 7
Arm 8
No Intervention
Active Comparator
Active Comparator
Active Comparator
Active Comparator
Active Comparator
Active Comparator
Active Comparator
Control (no oxytocin) + No recovery
Continuous oxytocin + No recovery
Continuous oxytocin + 30 minute recovery
Continuous oxytocin + 60 minute recovery
Control (no oxytocin) + No recovery + 10-7 oxytocin
Continuous oxytocin + No recovery + 10-7 oxytocin
Continuous oxytocin + 30 minute recovery + 10-7 oxytocin
Continuous oxytocin + 60 minute recovery + 10-7 oxytocin
A control experiment will be undertaken in which the myometrial explants will be exposed to PSS for 2-hours without any oxytocin. No recovery time.
10-5M oxytocin for 2 hours. No recovery time.
10-5M oxytocin for 2 hours. After 2 hours, the solution will be drained from the organ baths, and any residual solution will be removed by washing three times with PSS. Following this, the strip will be exposed to PSS for 30 minutes.
10-5M oxytocin for 2 hours. After 2 hours, the solution will be drained from the organ baths, and any residual solution will be removed by washing three times with PSS. Following this, the strip will be exposed to PSS for 60 minutes.
A second control experiment will be undertaken in which the myometrial explants will be exposed to PSS for 2-hours without any oxytocin. After 2 hours, the solution will be drained from the organ baths, and replaced with fresh PSS. Following this, the strip will be exposed to 10-7 oxytocin for 10 minutes.
10-5M oxytocin for 2 hours. After 2 hours, the solution will be drained from the organ baths, and any residual solution will be removed by washing three times with PSS. Following this, the strip will be exposed to 10-7 oxytocin for 10 minutes.
10-5M oxytocin for 2 hours. After 2 hours, the solution will be drained from the organ baths, and any residual solution will be removed by washing three times with PSS. Following this, the strip will be exposed to PSS for 30 minutes. The strip will then be exposed to 10-7 oxytocin for 10 minutes.
10-5M oxytocin for 2 hours. After 2 hours, the solution will be drained from the organ baths, and any residual solution will be removed by washing three times with PSS. Following this, the strip will be exposed to PSS for 60 minutes. The strip will then be exposed to 10-7 oxytocin for 10 minutes.