Haemorrhagic transformation (HT) of ischaemic infarction occurs when an area of brain infarction is stained with blood products, mainly red blood cells. An abnormally permeable blood–brain barrier resulting from ischaemia of the capillary endothelium allows this extravasation of blood products. HT is part of the natural history of some forms of ischaemic infarction, especially cerebral embolism, but it can be precipitated or enhanced by therapeutic interventions used in the acute phase of ischaemic stroke.
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