Snapshot A 21-year-old woman with past medical history of SLE presents with fever, fatigue, and altered mental status. On physical exam, a petechial rash is seen on her upper extremities. Her temperature is 103°F (39.4°C). Her labs are notable for Hgb 7.3 g/dL, platelets 17,000/mm3, and creatinine of 3.4 mg/dL. Introduction Thrombotic microangiopathy characterized by a pentad microangiopathic hemolytic anemia acute renal failure thrombocytopenia fever neurologic abnormalities Similar to HUS but with fever and neurologic symptoms Epidemiology female > male most commonly in young adults Pathogenesis deficiency or inhibition of metalloproteinase ADAMTS13 most commonly disabled by an autoantibody ADAMTS13 degrades vWF multimers deficiency → large vWF multimers → increased platelet adhesion → platelet thrombosis important underlying risk factor, but requires a secondary trigger triggers drugs (ticlopidine, clopidogrel, and cyclosporine) SLE Presentation Symptoms (recall pentad) thrombocytopenia easy bleeding epistaxis neurological symptoms confusion seizures thrombosis renal dysfunction (less so than HUS) Physical exam fever pallor (from anemia) purpura/petechiae jaundice (from hemolysis) splenomegaly Evaluation Complete blood count anemia thrombocytopenia Peripheral blood smear schistocytes (helmet cells) Serum ↑ LDH ↑ creatinine negative Coomb’s ↑ bleeding time normal PT/PTT Differential Diagnosis DIC HUS Sepsis Treatment Plasma exchange transfusion with fresh frozen plasma Steroids Splenectomy Platelet transfusion contraindicated platelet transfusion will worsen disease by feeding the platelet consumption Prognosis, Prevention, and Complications Prognosis remission with plasma exchange in majority of patients mortality rate 13-15% Complications permanent neurologic sequelae
QUESTIONS 1 of 5 1 2 3 4 5 Previous Next Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK (M1.HE.13.203) A 27-year-old male presents to the emergency department with a one day history of progressive confusion and oliguria. The patient has had several episodes of epistaxis and bleeding gums since the onset of his illness. Past medical history is unremarkable and the patient does not take medications. Temperature is 39C, blood pressure is 100/62 mm Hg, pulse is 95/min, and respiratory rate is 18/min. Physical exam is notable for a purpuric rash in the lower extremities bilaterally. Peripheral blood smear is shown in Figure A. Which of the following is the most likely mechanism behind the patient's illness? QID: 106270 FIGURES: A Type & Select Correct Answer 1 Defect in platelet aggregation 3% (5/199) 2 Deficiency in degradation of von Willenbrand Factor (vWF) multimers 57% (114/199) 3 Peripheral platelet destruction 26% (52/199) 4 Defect in platelet-to-collagen adhesion 5% (9/199) 5 Decreased levels of von Willenbrand Factor (vWF) 8% (16/199) M 1 Question Complexity C Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 2 Review Tested Concept Review Full Topic
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