Placenta Praevia

Question 1

Likelihood of placenta praevia resolution?

Answer 1

10/11 will resolve. 1/11 have persistent placenta praevia at term.
- 50% chance of persistence if anterior + previous CS

Question 2

Incidence of placenta accreta?

Answer 2

1/300-2000 pregnancies

i.e. <1%

Question 3

What is the incidence of placenta accreta associated with placenta praevia?

Answer 3

3% of praevia is accreta

Question 4

What is the risk of placenta praevia with:

1) 1 previous CS
2) 2 previous CS
3) 3 previous CS
4) 4 previous CS

Answer 4

1 = 11%
2= 40%
3=61%
4= 61%