Priority 19 from the Blood Pressure in Pregnancy PSP

UNCERTAINTY: How does the placenta contribute to pre-eclampsia?  (JLA PSP Priority 19)
Overall ranking 19
JLA question ID 0099/19
Explanatory note Not available for this PSP
Evidence

None identified
Health Research Classification System category  Reproductive health and childbirth
Extra information provided by this PSP
Original uncertainty examples Is there any known link between prolonged hyperemesis and placental problems (leading to high blood pressure)? ~ Are there any links to placental problems/iugr relating to incompatable maternal/paternal blood types? ~ Is the fetus affected by the disease itself other than decreased placental function If the placenta is the cause of PET, then why after 3 weeks do some women return with PET? 
Submitted by 2 women, 4 healthcare, 1 researcher, 1 other
PSP information
PSP unique ID 0099
PSP name Blood Pressure in Pregnancy
Total number of uncertainties identified by this PSP.

50 (To see a full list of all uncertainties identified, please see the detailed spreadsheet held on the JLA website)
Date of priority setting workshop 20 June 2019