The books state that a hyperemic or hemorrhagic border zone surrounding the infarction often arises – do these conditions coexist or is it one or the other, or are they the same? If they are the same, which is more correct to state (i.e. is it hyperemia or hemorrhage)?
Added by: Nikolaj
On: June 5th 2012
Dear Nikolaj,
Hyperemic and haemorrhagic is not the same, although the clinical presention might be identical. Hyperemia is a passive change with increased blood flow in a localized area caused by dilatation of capillaries. That is, in hyperemia the blood components do not leave the vessels. Haemorrhage is bleeding into the tissue. The redness in this case is thus caused by the leaving of red blood cells from the blood vessels to the surrounding tissue. When this is said, hyperemia and haemorrhage can occur simultaneously, depending of the cause of the disorder.