3. Identification and assessment of evidence
The Cochrane Library and the Cochrane Register of Controlled Trials were searched for relevant randomised
controlled trials, systematic reviews and meta-analyses. Recent consensus documents were also studied,
including an RCOG Study Group proceedings.6 A search of MEDLINE and PUBMED (electronic databases)
from 1966 to 2005 was also carried out. Search words included: ‘pregnancy’, ‘hypertension’, ‘pre-eclampsia’,
‘eclampsia’ and ‘toxaemia’.