Editing Perfusion (section)

==Malperfusion==

'''Malperfusion''' can refer to any type of incorrect perfusion though it usually refers to hypoperfusion. The meaning of the terms "overperfusion" and "underperfusion" is relative to the average level of perfusion that exists across all the tissues in an individual body. Perfusion levels also differ from person to person depending on metabolic demand.{{citation needed|date=March 2021}}

Examples follow:{{citation needed|date=March 2021}}
* [[Heart]] tissues are considered overperfused because they normally are receiving more blood than the rest of tissues in the organism; they need this blood because they are constantly working.
* In the case of skin cells, extra blood flow in them is used for [[thermoregulation]] of a body.  In addition to delivering [[oxygen]], blood flow helps to [[Dissipation|dissipate]] heat in a body by redirecting warm blood closer to its surface where it can help to cool a body through [[sweating]] and [[thermal dissipation]].
* Many types of [[tumor]]s, and especially certain types, have been described as "hot and bloody" because of their overperfusion relative to the body overall.

Overperfusion and underperfusion should not be confused with '''hypoperfusion''' and '''hyperperfusion''', which relate to the perfusion level relative to a tissue's current need to meet its metabolic needs. For example, hypoperfusion can be caused when an [[artery]] or [[arteriole]] that supplies blood to a volume of tissue becomes blocked by an [[embolus]], causing either no blood or at least not enough blood to reach the tissue. Hyperperfusion can be caused by [[inflammation]], producing [[hyperaemia|hyperemia]] of a body part. Malperfusion, also called poor perfusion, is any type of incorrect perfusion. There is no official or formal dividing line between hypoperfusion and [[ischemia]]; sometimes the latter term refers to zero perfusion, but often it refers to any hypoperfusion that is bad enough to cause [[necrosis]].{{citation needed|date=March 2021}}