implantation and placental growth

Question 1

where does normal implantation happen?

Answer 1

in the posterior or anterior wall of the uterus

Question 2

what is placenta previa? what is its frequency?

Answer 2

5:1000 births. it is caused by implantation at the internal os of the uterus and growing placenta comes to cover the opening.

Question 3

risk factors for placenta previa include (5)

Answer 3

prior placenta previa (4-8%)
caesarian section
maternal age (women over 30, three times higher than women under 20)
multiple fetuses
induced abortion

Question 4

what are potential complications of placenta previa? 4

Answer 4

maternal hemorrhaging (0.03% mortality)
Rh factor incompatibility
fetal anemia
intrauterine growth retardation (IUGR)