In this study, the volume of blood vessels increased
in PP group compared with the control
group. In Biwas’s study, myometrial spiral arterioles
increased in previa group (7). Maly studied
the placentas of preeclampsia patients (PE) by the
stereological method and found that in PE group
the volume of blood vessels was less than the control
group. As we know, PP is a protective factor
for PE and reduces the rate of PE (17), thus the
opposite results in PP could be justifiable. It has