Placenta praevia - introduction

Question 1

Incidence of vasa praevia

Answer 1

1: 2000 to 1: 6000

Question 2

Mortality from vasa praevia

Answer 2

60 %

Question 3

Survival from vasa praevia if diagnosed antenatally

Answer 3

97%

Question 4

IVF and vasa praevia incidence

Answer 4

1 : 300

Question 5

% TVS that reclassify low lying placenta to clear of the os placenta

Answer 5

26 - 60 %

Question 6

F/up of women with low lying placenta

Answer 6

• 36 weeks if asymptomatic
• 32 weeks if ? accreta or ant in previous c/s
• If still low at 32 weeks, 72% will be low at term

Question 7

Risk of PPH at time of C/S in placenta praevia

Answer 7

12 times more likely that in routine C/S

Question 8

% cases of vasa praevia which self resolve

Answer 8

15 %

Question 9

Management of confirmed cases of vasa praevia

Answer 9

• Admit between 28 - 32 weeks
• Steroids
• Deliver by C/S 35 - 37 weeks