All of the following are causes of fragmented RBC in peripheral blood Except:
**Core Concept**
The presence of fragmented red blood cells (RBCs) in the peripheral blood is indicative of microangiopathic hemolytic anemia, a condition characterized by the mechanical destruction of RBCs as they pass through small blood vessels. This phenomenon can be caused by various underlying pathologies.
**Why the Correct Answer is Right**
Fragmented RBCs are typically seen in conditions involving mechanical trauma to the blood vessels, such as thrombotic thrombocytopenic purpura (TTP), hemolytic uremic syndrome (HUS), or severe hypertension. The mechanical stress on the RBCs leads to their fragmentation, resulting in the characteristic "schistocytes" observed on peripheral blood smear. In TTP and HUS, this is often due to the formation of microthrombi within the small blood vessels, which can cause RBCs to be sheared and fragmented.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it is not a known cause of fragmented RBCs. However, the actual option is missing. Please provide the options for accurate explanation.
**Option B:** This option is incorrect as it is not a known cause of fragmented RBCs. However, the actual option is missing. Please provide the options for accurate explanation.
**Option C:** This option is incorrect as it is not a known cause of fragmented RBCs. However, the actual option is missing. Please provide the options for accurate explanation.
**Clinical Pearl / High-Yield Fact**
A key clinical pearl to remember is that the presence of fragmented RBCs in the peripheral blood is often associated with a "pentad" of symptoms, including microangiopathic hemolytic anemia, thrombocytopenia, renal failure, neurological symptoms, and fever.
**Correct Answer:** A.