Figure 1028

Uteroplacental circulation in normal pregnancy and preeclampsia.

A, Normal placentation involves the transformation of the branches of the maternal uterine arteries—the spiral arteries—from thick-walled muscular arteries into saclike flaccid vessels that permit delivery of greater volumes of blood to the uteroplacental unit.

B, Evidence exits that in women with preeclampsia this process is incomplete, resulting in relatively narrowed spiral arteries and decreased perfusion of the placenta [25].

0 0

Post a comment