Maternal and perinatal outcomes of early- versus late-onset Preeclampsia at a tertiary hospital in Bangladesh: A retrospective cohort study

Pregnancy is a profound biological journey, but for some women, it becomes a race against time complicated by a condition called pre-eclampsia. This disorder, which affects roughly one in ten pregnancies in some parts of the world, is marked by a dangerous rise in blood pressure that can damage a mother's organs and disrupt the flow of nutrients to the baby. While doctors have long known that pre-eclampsia is serious, they have also observed that it does not always behave the same way. Sometimes it appears late in pregnancy, closer to the due date, and sometimes it strikes much earlier, often before the baby is fully developed. This difference in timing is not just a matter of calendar dates; it hints at two distinct biological processes with very different risks for both mother and child. Understanding whether the timing of the onset changes the outcome is crucial, especially in regions where medical resources are stretched thin and every decision about when to deliver a baby carries immense weight.

In a recent study conducted at a major hospital in Faridpur, Bangladesh, researchers set out to untangle these differences by looking back at the medical records of hundreds of women who had given birth there. The team focused specifically on comparing two groups: those whose pre-eclampsia began before 34 weeks of pregnancy, known as early-onset, and those whose condition started at 34 weeks or later, known as late-onset. They gathered data from 255 women who had been diagnosed with the condition, carefully tracking what happened to them and their babies. The goal was to see if the timing of the diagnosis predicted who would face the most severe complications, a question that had not been thoroughly answered in this specific setting before.

The results painted a clear and stark picture of how the timing of the disease shapes the experience of pregnancy. While the mothers in both groups faced significant health challenges, the babies born to mothers with early-onset pre-eclampsia faced a much grimmer reality. In the early-onset group, nearly three out of every ten pregnancies ended in stillbirth, a tragic outcome that occurred in only about three out of every hundred cases for the late-onset group. For the babies who were born alive, the difference was just as dramatic. Those born to mothers with early-onset pre-eclampsia were far more likely to be born prematurely, to have a very low birth weight, and to require admission to a hospital nursery for intensive care. In fact, almost nine out of ten babies in the early-onset group experienced at least one serious health problem after birth, compared to roughly one out of four in the late-onset group.

The study also revealed that the mothers themselves faced different types of risks depending on when the disease started. Women with early-onset pre-eclampsia were significantly more likely to develop a severe complication called eclampsia, where seizures occur, and to experience placental abruption, a dangerous condition where the placenta separates from the uterus before delivery. Although the overall rate of severe complications for mothers was high in both groups, the specific nature of the danger was more acute for those with the early form of the disease. Interestingly, the researchers found that the timing of the onset did not independently predict whether a mother would die or suffer a major complication when they accounted for other factors like age and pre-existing health conditions. However, the link between early onset and poor outcomes for the baby remained incredibly strong, even after adjusting for all other variables.

One of the most telling findings concerned how the babies were delivered. The study showed that women with late-onset pre-eclampsia were much more likely to have a cesarean section than those with early-onset pre-eclampsia. This was not because the late-onset cases were more dangerous, but rather a reflection of medical strategy. When a baby is born early due to early-onset pre-eclampsia, doctors often try to wait as long as safely possible to let the baby mature, which can sometimes allow for a vaginal delivery. In contrast, when pre-eclampsia appears later in pregnancy, when the baby is already full-term, doctors are more likely to schedule a cesarean section to avoid the risks of labor. This distinction highlights that the medical response is often dictated by the gestational age of the baby rather than just the severity of the mother's condition.

The researchers concluded that early-onset pre-eclampsia represents a distinct and particularly dangerous form of the disease, primarily because it forces the body to deliver a baby before it is ready. The placenta in these cases often fails to develop properly early in the pregnancy, leading to a lack of oxygen and nutrients for the fetus. To save the mother's life, doctors must often end the pregnancy prematurely, which inevitably leads to the severe health issues seen in the newborns. The study suggests that in places like Bangladesh, where access to specialized care can be limited, identifying women at risk for early-onset pre-eclampsia is critical. It points to a need for better screening early in pregnancy and for ensuring that women with this specific condition are managed in hospitals equipped with advanced neonatal care units. By recognizing that the timing of the onset tells a different story, healthcare providers can better prepare for the unique challenges each group faces, potentially saving lives and improving the health of mothers and their children.