Blood pressure medicines and uterine muscle function in pregnant women with diabetes

This research study is testing how three blood pressure medications—ephedrine, phenylephrine, and norepinephrine—affect the uterus's ability to contract during cesarean delivery in pregnant women with type 2 or gestational diabetes. Researchers will collect small samples of uterine tissue during scheduled cesarean deliveries and test how these medications influence muscle contractions in a laboratory setting. The goal is to understand whether these medications might increase the risk of excessive bleeding after delivery in women with diabetes.

Women with type 2 or gestational diabetes face a significantly higher risk of dangerous postpartum bleeding (excessive bleeding after delivery), even after accounting for other risk factors like obesity. During cesarean delivery, anesthesia can cause a drop in blood pressure, so doctors administer blood pressure medications to correct this—but these medications may inadvertently weaken the uterus's natural contractions, which normally help prevent bleeding. This study aims to determine which blood pressure medications are safest for women with diabetes during cesarean delivery.