A patient with petechiae, diffuse hemorrhages, altered mental status, oliguria, and focal ischemia is most consistent with which diagnosis?

A patient with petechiae, diffuse hemorrhages, altered mental status, oliguria, and focal ischemia is most consistent with which diagnosis?

• A. Disseminated intravascular coagulation
• B. Iron deficiency anemia
• C. Thrombotic thrombocytopenic purpura
• D. Vitamin K deficiency

Answer: (A)

Disseminated intravascular coagulation is a consumptive coagulopathy where widespread activation of the coagulation system leads to formation of microvascular clots and rapid consumption of platelets and clotting factors. That combination explains the patient’s picture: petechiae and diffuse hemorrhages arise from the bleeding tendency after clotting factors and platelets are used up, while altered mental status, oliguria, and focal ischemia reflect organ injury from microthrombi in the brain and kidneys. In DIC you’d typically see both bleeding and clotting issues, with laboratory evidence of prolonged clotting times, low platelets, low fibrinogen, and elevated D-dimer due to widespread fibrinolysis. Other conditions don’t fit as well: vitamin K deficiency causes bleeding but not the pervasive microvascular thrombosis and organ ischemia; iron deficiency anemia doesn’t produce petechiae or acute organ dysfunction; thrombotic thrombocytopenic purpura can cause CNS and renal signs with thrombocytopenia, but coagulation tests are usually normal in TTP, whereas DIC shows a consumptive coagulopathy with abnormal coagulation studies.

Disseminated intravascular coagulation is a consumptive coagulopathy where widespread activation of the coagulation system leads to formation of microvascular clots and rapid consumption of platelets and clotting factors. That combination explains the patient’s picture: petechiae and diffuse hemorrhages arise from the bleeding tendency after clotting factors and platelets are used up, while altered mental status, oliguria, and focal ischemia reflect organ injury from microthrombi in the brain and kidneys. In DIC you’d typically see both bleeding and clotting issues, with laboratory evidence of prolonged clotting times, low platelets, low fibrinogen, and elevated D-dimer due to widespread fibrinolysis. Other conditions don’t fit as well: vitamin K deficiency causes bleeding but not the pervasive microvascular thrombosis and organ ischemia; iron deficiency anemia doesn’t produce petechiae or acute organ dysfunction; thrombotic thrombocytopenic purpura can cause CNS and renal signs with thrombocytopenia, but coagulation tests are usually normal in TTP, whereas DIC shows a consumptive coagulopathy with abnormal coagulation studies.