Been reminded of this as Nickinha mentioned she had it (perhaps you know the answer Nickinha).
My sister developed HELP syndrome at the end of her last pregnancy. It was all very scary, we nearly lost her (she spent quite a long time in intensive care).
Its 10 years on, and as her big sis and kind of surrogate Mum since our Mum died, I'm trying not to worry about her too much now she's announced she's pregnant again. Am very happy for her as its what she and her dh wants, but would like some reassurance from anyone in the know.