The placenta is like a bustling market where oxygen passes from mother to child. If the stalls are neatly arranged and goods are delivered quickly, everyone gets enough. But when the aisles get clogged, traffic jams start: some places are crowded, others empty. Researchers have found a way to peek into this market using magnetic resonance imaging (MRI) and, in a single scan, see two things at once: how much oxygen is in every corner of the placenta and how unevenly it is distributed.
In healthy pregnant women, as the pregnancy advances, oxygen in the placenta becomes increasingly patchy, but a smooth zone remains in the central part: there, blood mixes and renews well. On the fetal side, where blood has already given up oxygen, the patchiness is stronger. In complicated pregnancies, this unevenness grows, especially on the fetal side: it looks like blood stagnates and renews poorly there.
This dual view helps us understand how the placenta copes with its job at different stages and could become an early warning sign for pregnancy problems. Instead of waiting for obvious symptoms, a doctor could see that the oxygen market is starting to have disruptions.
The placenta is the only organ that a person grows anew with each pregnancy and that completely dies off after childbirth.