Welcome back, everyone. Today we're diving into one of the most hotly debated topics in obstetrics- should we be treating preeclampsia without severe features with antihypertensive medications during expectant management? Now, if you've been following the literature- and our show, you know that the landmark CHAP trial changed the game for chronic hypertension in pregnancy. It showed us that targeting a blood pressure below 140 over 90 reduces serious maternal complications, without harming the baby. That was a big deal. But here's the thing, CHAP studied chronic hypertension. Then there was the CHIP trial- that also found that tight control of gestational hypertension and nonproteinuric chronic hypertension was also beneficial. These did not address preeclampsia without severe features, and yet, the ripple effects of that trial have sparked a global conversation about whether we should be extending those same treatment principles to women with preeclampsia who don't yet have severe features. And this is where it gets really interesting, because the guidelines don't agree. In the United States, ACOG and the Society for Maternal-Fetal Medicine still say: hold off on antihypertensives unless blood pressures hit the severe range at 160/110. But step outside the US, and you'll find the World Health Organization, the International Society for the Study of Hypertension in Pregnancy, FIGO, NICE, and Hypertension Canada all recommending treatment at 140 over 90, regardless of whether the diagnosis is chronic hypertension, gestational hypertension, or preeclampsia. So who's right? And more importantly what does this mean for the patient sitting in front of you right now, at 34 weeks, with a blood pressure of 150 over 95, some proteinuria, but no severe features? Today, we're going to break this down. We'll review the controversy, walk through the divergent guidelines, and most importantly talk about the real, practical implications that favor treating these patients during expectant management. Because when you're watching someone with preeclampsia, waiting for the right time to deliver, there's a strong argument that controlling their blood pressure isn't just reasonable…may be protective. So grab your coffee, settle in, and let's get into it. 1. Society for Maternal-Fetal Medicine Statement: Antihypertensive Therapy For mild chronic Hypertension in Pregnancy-The Chronic Hypertension And Pregnancy Trial. American Journal of Obstetrics and Gynecology. 2022. Society for Maternal-Fetal Medicine; Publications Committee. 2. Preeclampsia. The New England Journal of Medicine. 2022. Magee LA, Nicolaides KH, von Dadelszen P. 3. Antihypertensive Drug Therapy for Mild to Moderate Hypertension During Pregnancy.The Cochrane Database of Systematic Reviews. 2018. Abalos E, Duley L, Steyn DW, C. 4. Prevention and Treatment of Maternal Stroke in Pregnancy and Postpartum: A Scientific Statement From the American Heart Association. Stroke. 2026. Miller EC, Bello NA, Chen PR, et al. 5.Hypertension in Pregnancy: Diagnosis, Blood Pressure Goals, and Pharmacotherapy: A Scientific Statement From the American Heart Association. Hypertension. 2022. Garovic VD, Dechend R, Easterling T, et al.
