Abstract
Thrombotic thrombocytopenic purpura (TTP) and atypical hemolytic uremic syndrome (aHUS)
are thrombotic microangiopathies (TMAs) that can present in pregnancy. The presentation
can be with typical microangiopathic features and thrombocytopenia, but there is also
a significant risk of in-utero fetal loss. TTP presents most commonly in the third
trimester and aHUS in the postpartum period. On presumptive diagnosis, plasma exchange
should be started and ADAMTS13 (a disintegrin and metalloproteinase with a thrombospondin
type 1 motif, member 13) activity measured. An activity of < 10% is in keeping with
TTP, which may be late-onset congenital TTP or acquired disease: the former will require
regular plasma therapy and the latter immunosuppression. In aHUS, eculizumab is the
therapy of choice. In future pregnancies, follow-up with a multidisciplinary team
including fetomaternal and specialist obstetrics should be undertaken.
Keywords
thrombotic thrombocytopenic purpura - TTP - atypical hemolytic uremic syndrome - aHUS
- pregnancy