Petechial hemorrhages are clinically evident in________________?
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Answer: D. thrombocytopenic purpura
Explanation
Thrombocytopenic purpura involves a severe quantitative deficiency or functional defect of circulating blood platelets. Platelets are essential for maintaining vascular integrity and forming primary hemostatic plugs after minor injuries. Without adequate platelets, spontaneous microvascular bleeding occurs, resulting in visible petechial hemorrhages. Normal platelet counts range between 150,000 and 400,000 per microliter of human blood. Purpura refers to purple-colored spots on the skin or mucous membranes caused by internal bleeding. Hemostasis relies on the coordinated interaction between blood vessels, platelets, and coagulation cascade proteins.
Dental patients with this bleeding disorder may experience spontaneous gingival bleeding and mucosal petechiae. Hematologists perform complete blood counts and platelet studies to diagnose underlying systemic bleeding disorders. Surgical procedures in affected patients require careful coordination with medical specialists to prevent hemorrhage. Cyclic neutropenia involves periodic fluctuations in neutrophil counts rather than a primary platelet deficiency. Agranulocytosis is characterized by a severe reduction in white blood cells rather than low platelets. Pernicious anemia affects red blood cell maturation due to vitamin B12 deficiency without causing petechiae.
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