Which type of RBC fragment is found in DIC, artificial heart valves, microangiopathic hemolytic anemia, and uremia?

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RBC fragments produced by mechanical destruction are schistocytes, also called helmet cells. They form when red cells are sheared as they traverse damaged or obstructed microvasculature, such as in disseminated intravascular coagulation, microangiopathic hemolytic anemia, or around artificial heart valves. Uremia can also cause microangiopathic changes that produce these fragmented cells. Schistocytes are typically irregular, jagged fragments with reduced or absent central pallor, reflecting their broken, helmet-like appearance.

Other red cell shapes reflect different processes. Target cells result from altered membrane-to-volume ratio seen in liver disease, thalassemias, or iron deficiency; drepanocytes are sickled cells characteristic of sickle cell disease; elliptocytes are elongated oval cells seen in elliptocytosis and some other disorders. None of these describe the fragmented cells produced by mechanical destruction seen in the scenarios listed.