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Zorluk: OrtaHemodynamic and Coagulation Processes

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

  • A 28-year-old woman with recurrent second-trimester fetal losses and a prior deep vein thrombosis presents with an isolated, persistently prolonged aPTT that fails to correct upon a 1:1 mixing study with normal plasma.Antiphospholipid syndrome (Lupus anticoagulant)
  • A 19-year-old woman with lifelong heavy menstrual bleeding and frequent epistaxis presents with a normal platelet count, normal PT, mildly prolonged aPTT, and a prolonged bleeding time.von Willebrand disease
  • A 65-year-old man in the intensive care unit with gram-negative sepsis develops mucosal oozing, thrombocytopenia, prolonged PT and aPTT, decreased fibrinogen, and an elevated D-dimer.Disseminated intravascular coagulation
  • A 14-year-old boy develops acute severe hemarthrosis of the right knee following minor trauma. Laboratory evaluation shows a normal PT, prolonged aPTT that completely corrects on a 1:1 mixing study, and normal bleeding time.Hemophilia (Factor VIII or IX deficiency)

Cevap

The presentations map to their underlying disorders based on precise laboratory markers: the uncorrectable aPTT with thrombosis matches antiphospholipid syndrome; mucocutaneous bleeding with prolonged bleeding time matches von Willebrand disease; consumptive coagulopathy matches DIC; and correctable aPTT with hemarthrosis matches Hemophilia.
Each patient's clinical scenario provides specific laboratory markers that isolate the underlying hemostatic defect to primary hemostasis, secondary hemostasis (intrinsic, extrinsic, or common pathway), factor consumption, or the presence of an inhibitor. Accurately matching these profiles identifies the correct pathophysiologic mechanism.

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1
Analyze the first presentation involving recurrent fetal loss, thrombosis, and an isolated prolonged aPTT that fails to correct on a mixing study.
The failure to correct indicates the presence of an inhibitor (lupus anticoagulant) rather than a factor deficiency, matching antiphospholipid syndrome.
Mixing studies differentiate between factor deficiencies (which correct) and inhibitors (which do not correct).
2
Evaluate the second presentation featuring mucocutaneous bleeding, normal platelet count, mildly prolonged aPTT, and a prolonged bleeding time.
This pattern points to primary hemostasis failure with a secondary mild intrinsic pathway defect, matching von Willebrand disease.
Von Willebrand factor facilitates platelet adhesion (affecting bleeding time) and stabilizes Factor VIII (affecting aPTT).
3
Review the third presentation of an intensive care unit patient with sepsis, diffuse oozing, thrombocytopenia, and global coagulation prolongation.
This reflects consumptive coagulopathy, specifically matching disseminated intravascular coagulation (DIC).
Sepsis is a classic trigger for the widespread activation of coagulation and subsequent depletion of clotting factors and platelets.
4
Assess the fourth presentation of a boy with acute hemarthrosis and an isolated prolonged aPTT that corrects on a mixing study.
A correctable isolated aPTT with deep tissue bleeding points to an intrinsic pathway factor deficiency, matching Hemophilia A or B.
Hemarthroses are a hallmark of secondary hemostasis defects, and the mixing study confirms a true factor deficiency.

Anahtar Kavram

Hemodynamic and Coagulation Processes: Interpretation of Coagulation Profiles and Mixing Studies
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Hemodynamic and Coagulation Processes

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