A 42-year-old woman is admitted to the intensive care unit with confusion, petechiae, and dark urine. Laboratory testing reveals a hemoglobin of , a platelet count of , an elevated indirect bilirubin, and an elevated lactate dehydrogenase (LDH). Her prothrombin time and activated partial thromboplastin time are normal. You strongly suspect thrombotic thrombocytopenic purpura (TTP). Arrange the following steps in the most appropriate sequential order for the immediate diagnostic and therapeutic management of this patient.
- 1Review a peripheral blood smear for the presence of schistocytes.
- 2Obtain a blood sample for ADAMTS13 activity level testing.
- 3Initiate emergent therapeutic plasma exchange (TPE).
- 4Monitor daily platelet counts and lactate dehydrogenase (LDH) levels.
Answer
The correct sequential order for managing suspected TTP is to first confirm microangiopathic hemolytic anemia with a peripheral blood smear, then draw the ADAMTS13 assay sample, immediately initiate therapeutic plasma exchange (TPE), and finally monitor the clinical response.
The management of TTP follows a strict sequence to ensure diagnostic accuracy and therapeutic efficacy. Confirming microangiopathic hemolytic anemia with a peripheral smear is the fastest initial step. Drawing the ADAMTS13 assay before administering any plasma is critical to avoid false-negative results. TPE is a life-saving intervention that must be started emergently without waiting for the ADAMTS13 results. Finally, disease resolution is tracked by monitoring markers of hemolysis and platelet consumption.
Step-by-Step Solution
Key Concept
Sequential diagnostic and therapeutic management of suspected Thrombotic Thrombocytopenic Purpura (TTP).