Population-based trends in pregnancy hypertension and pre-eclampsia: an international comparative study.

Summary: Doctors faced a medical mystery: as mothers have become older and heavier on average—two major triggers for high blood pressure—rates of pregnancy hypertension and pre-eclampsia should have skyrocketed. Surprisingly, a massive study of seven countries showed these rates actually dropped in Europe, Canada, and Australia. The likely hero? A shift in medical practice. Doctors are delivering babies slightly earlier, preventing blood pressure issues from escalating. However, the U.S. (specifically Massachusetts) was the outlier where rates rose, potentially due to different record-keeping methods or less proactive intervention.