Thrombotic thrombocytopenic purpura (TTP) is a potentially reversible, life-threatening medical emergency. We present a case of a 21-year-old female with evidence of haemolytic anaemia based on the presence of positive markers of haemolysis. Negative Coomb's test, thrombocytopenia and placental infarcts raised suspicion for a thrombotic microangiopathy. She was diagnosed with TTP and managed with emergency plasma exchange. Her recovery was immediate.
A presumptive diagnosis of TTP should be based on the presence of microangiopathic haemolytic anaemia with thrombocytopenia and plasma exchange should be initiated while complete work up is pending. Using the regular pentad solely for diagnosis of TTP will lead to underdiagnosis of many cases and should be avoided.
Several microangiopathies can be seen during pregnancy including TTP/atypical haemolytic uraemic syndrome, HELLP syndrome, pre-eclampsia, disseminated intravascular coagulopathy and antiphospholipid antibody syndrome. Distinction between each type will be the focus of our discussion as treatment decisions differ accordingly.
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