The diagnostic dilemma of thrombotic thrombocytopenic purpura/hemolytic uremic syndrome in the obstetric triage and emergency department: lessons from 4 tertiary hospitals.

Objective: We report a series of occurrences of thrombotic thrombocytopenic purpura (TTP)/hemolytic uremic syndrome (HUS) in pregnancy that emphasizes early diagnosis.

Study Design: Fourteen pregnancies with TTP (n = 12) or HUS (n = 2) were studied. Analysis focused on clinical and laboratory findings on examination, initial diagnosis, and treatment.

Results: There were 14 pregnancies in 12 patients; 2 cases of TTP were diagnosed as recurrent. Five women were admitted to the emergency department (ED), and 7 patients were admitted to an obstetrics triage. Patients who were evaluated by an obstetrician were treated initially for hemolysis, elevated liver enzymes and low platelets syndrome/preeclampsia, whereas patients who were seen in the ED had a diagnosis that is commonplace in the ED (panic attack, domestic violence, gastroenteritis). Latency from the onset of symptoms to diagnosis ranged from 1-7 days. Plasmapheresis treatments in early gestation resulted in favorable maternal-neonatal outcome. Maternal and perinatal mortality rates were 25% each.

Conclusion: TTP/HUS is a challenging diagnosis in obstetric triage and ED areas. We propose a management scheme that suggests how to triage patients for early diagnosis in pregnancy.