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Difficulty: MediumHematology and Oncology

A 24-year-old woman comes to the emergency department because she has noticed a new rash on her legs and bleeding from her gums when she brushes her teeth over the past 3 days. She feels otherwise well and reports no fever, weight loss, joint pain, or recent illnesses. She has no significant past medical history and takes no medications. Vital signs are within normal limits. Physical examination reveals scattered, non-blanching, pinpoint red macules over her bilateral lower extremities and small purpura on her buccal mucosa. There is no jaundice, lymphadenopathy, or hepatosplenomegaly.

Laboratory studies show:
Hemoglobin: 13.2 g/dL
Leukocyte count: 7,500/mm³
Platelet count: 12,000/mm³
Prothrombin time (PT): 11 seconds
Activated partial thromboplastin time (aPTT): 30 seconds

A peripheral blood smear reveals enlarged platelets but is otherwise unremarkable, with no fragmented red blood cells or blasts seen.

Which of the following is the most appropriate next step in management for this patient?

  1. A
    Observe and recheck the complete blood count in one week
  2. B
    Perform therapeutic plasma exchange
  3. Administer systemic glucocorticoidsAnswer
  4. D
    Transfuse platelet concentrate
  5. E
    Schedule an urgent splenectomy

Answer

The most appropriate next step in management is to administer systemic glucocorticoids.
This patient's clinical presentation of mucocutaneous bleeding (petechiae, bleeding gums) combined with isolated profound thrombocytopenia and large platelets on peripheral smear is classic for Immune Thrombocytopenic Purpura (ITP). ITP is characterized by IgG autoantibodies directed against platelet surface antigens. In adults, management is dictated by the platelet count and bleeding severity. When a patient has active bleeding or a platelet count below 30,000/mm³, pharmacological intervention is indicated to prevent life-threatening hemorrhage. The most appropriate initial step is the administration of systemic glucocorticoids (such as prednisone or dexamethasone), which impair reticuloendothelial destruction of platelets and decrease autoantibody production. Intravenous immunoglobulin (IVIG) may also be added if a rapid rise is necessary, but glucocorticoids represent the fundamental first-line therapy.

Step-by-Step Solution

1
Identify the primary clinical problem from the presentation and lab data.
A young woman presenting with mucocutaneous bleeding and isolated severe thrombocytopenia (12,000/mm³).
Recognizing the isolated nature of the thrombocytopenia with completely normal coagulation studies narrows the differential diagnosis significantly.
2
Interpret the peripheral blood smear findings.
Large platelets are seen, but there are no schistocytes, blasts, or significant anemia.
This rules out microangiopathic hemolytic anemias like TTP or HUS, as well as primary bone marrow failure or leukemia, strongly supporting a diagnosis of Immune Thrombocytopenic Purpura (ITP).
3
Determine the indication for treatment based on current clinical guidelines.
The patient requires immediate treatment because her platelet count is < 30,000/mm³ and she has active mucosal bleeding.
Observation is only appropriate if the platelet count is > 30,000/mm³ without active bleeding.
4
Select the best initial pharmacological therapy.
Systemic glucocorticoids.
Glucocorticoids (often combined with IVIG) represent the standard first-line therapy to rapidly decrease platelet destruction and increase platelet counts in symptomatic ITP.

Key Concept

The initial management of adult Immune Thrombocytopenic Purpura (ITP) with active bleeding or a platelet count < 30,000/mm³ requires systemic glucocorticoids, with or without intravenous immunoglobulin (IVIG).
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Topics

Hematology and Oncology

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