Which condition is commonly caused by immune-mediated destruction of platelets leading to isolated thrombocytopenia?

Which condition is commonly caused by immune-mediated destruction of platelets leading to isolated thrombocytopenia?

• A. ITP
• B. TTP
• C. DIC
• D. HELLP

Answer: (A)

Immune thrombocytopenic purpura (ITP) is characterized by immune-mediated destruction of platelets that leads to isolated thrombocytopenia. Autoantibodies—often IgG—target platelet surface glycoproteins, tagging them for clearance in the spleen. This reduces the platelet count while coagulation factors and red blood cells remain normal, so there’s bleeding risk without the signs of a systemic coagulopathy or hemolysis. Clinically, you see mucocutaneous bleeding and petechiae rather than schistocytes or organ dysfunction. This helps distinguish it from other conditions: thrombotic thrombocytopenic purpura involves microangiopathic hemolysis and neurologic symptoms; disseminated intravascular coagulation shows a consumptive coagulopathy with prolonged PT/aPTT, low fibrinogen, and high D-dimer; HELLP syndrome occurs in pregnancy with hemolysis, elevated liver enzymes, and low platelets. In emergency care, recognizing isolated thrombocytopenia with normal coagulation tests points toward ITP, guiding treatment toward therapies that boost platelet counts (like steroids or IVIG) and addressing any secondary causes, rather than focusing on correcting a global coagulopathy.

Immune thrombocytopenic purpura (ITP) is characterized by immune-mediated destruction of platelets that leads to isolated thrombocytopenia. Autoantibodies—often IgG—target platelet surface glycoproteins, tagging them for clearance in the spleen. This reduces the platelet count while coagulation factors and red blood cells remain normal, so there’s bleeding risk without the signs of a systemic coagulopathy or hemolysis. Clinically, you see mucocutaneous bleeding and petechiae rather than schistocytes or organ dysfunction. This helps distinguish it from other conditions: thrombotic thrombocytopenic purpura involves microangiopathic hemolysis and neurologic symptoms; disseminated intravascular coagulation shows a consumptive coagulopathy with prolonged PT/aPTT, low fibrinogen, and high D-dimer; HELLP syndrome occurs in pregnancy with hemolysis, elevated liver enzymes, and low platelets. In emergency care, recognizing isolated thrombocytopenia with normal coagulation tests points toward ITP, guiding treatment toward therapies that boost platelet counts (like steroids or IVIG) and addressing any secondary causes, rather than focusing on correcting a global coagulopathy.