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Difficulty: MediumHematology and Oncology

Match each patient's clinical presentation and laboratory coagulation profile with the most likely underlying bleeding disorder.

  • A 23-year-old man evaluated for acute right knee swelling after a minor trauma. Laboratory evaluation reveals a normal prothrombin time (PT), a prolonged activated partial thromboplastin time (aPTT), and a normal bleeding time.Hemophilia A
  • A 25-year-old woman evaluated for heavy menstrual bleeding and frequent epistaxis. Laboratory evaluation reveals a normal PT, a prolonged aPTT, and a prolonged bleeding time.Von Willebrand disease
  • A 65-year-old man in the intensive care unit with urosepsis who develops diffuse oozing from venipuncture sites. Laboratory evaluation reveals a prolonged PT, a prolonged aPTT, decreased fibrinogen, and significant thrombocytopenia.Disseminated intravascular coagulation
  • A 60-year-old man who has been receiving prolonged enteral nutrition without supplementation and broad-spectrum antibiotics. Laboratory evaluation reveals a prolonged PT, a prolonged aPTT, and a normal platelet count.Vitamin K deficiency

Answer

The correct pairings match the 23-year-old with hemarthroses to Hemophilia A, the 25-year-old with mucosal bleeding to Von Willebrand disease, the 65-year-old with sepsis to Disseminated intravascular coagulation, and the 60-year-old on antibiotics to Vitamin K deficiency.
Each diagnostic match correctly pairs a specific underlying pathophysiology with its characteristic clinical presentation and laboratory profile. Hemophilia A involves an isolated intrinsic pathway defect. Von Willebrand disease involves both an intrinsic pathway defect and a primary hemostasis defect. DIC is a consumptive coagulopathy affecting all pathways and platelets. Vitamin K deficiency affects multiple vitamin K-dependent factors across intrinsic and extrinsic pathways but spares platelets.

Step-by-Step Solution

1
Analyze the clinical bleeding pattern for each patient.
Identified whether the patient is experiencing deep tissue bleeding (suggesting secondary hemostasis defects) or mucosal/petechial bleeding (suggesting primary hemostasis defects).
Bleeding patterns provide the first clinical clue differentiating platelet disorders from coagulation factor deficiencies.
2
Evaluate the prothrombin time (PT) and activated partial thromboplastin time (aPTT).
Determined which coagulation pathways are affected: isolated aPTT points to intrinsic pathway, isolated PT to extrinsic, and both to common pathway or multiple factor deficiencies.
PT and aPTT isolate specific segments of the coagulation cascade to narrow down the diagnosis.
3
Correlate bleeding time and platelet counts with the coagulation times.
Differentiated between pure coagulation factor deficiencies (normal bleeding time/platelets) and mixed or consumptive disorders (abnormal bleeding time/platelets).
Bleeding time and platelet counts directly assess primary hemostatic function, which helps distinguish conditions like DIC or Von Willebrand disease from pure hemophilias.
4
Match the integrated clinical and laboratory findings to the specific pathophysiologic mechanism of each listed bleeding disorder.
Successfully paired each patient scenario with its definitive diagnosis.
Final confirmation requires synthesizing the physical presentation and full laboratory profile with known disease mechanisms.

Key Concept

Interpretation of laboratory coagulation profiles to diagnose specific bleeding disorders based on pathway defects.
Estimated Time:1m 30s
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Topics

Hematology and Oncology

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