Hyperaemia

Hyperaemia

Infobox_Disease
Name = PAGENAME


Caption =
DiseasesDB = 4466
ICD10 =
ICD9 = ICD9|780.99
ICDO =
OMIM =
MedlinePlus =
eMedicineSubj =
eMedicineTopic =
MeshID = D006940

Hyperemia describes the increase of blood flow to different tissues in the body. It can have medical implications, but is also a regulatory response, allowing change in blood supply to different tissues through vasodilation.

Hyperemia and the regulation of blood flow

Functional hyperemia is an increase in blood flow to a tissue due to the presence of metabolites and a change in general conditions. When a tissue increases activity there is a well characterized fall in the partial pressure of oxygen and pH, an increase in partial pressure of carbon dioxide, and a rise in temperature and the concentration of potassium ions. The mechanism for vasodilation is unclear, but it may have something to do with the opening of precapillary sphincters.

Active hyperemia is a term used to describe dilation of arteriolar smooth muscle to increase blood flow in response to an increase in metabolism.

Reactive hyperemia is a profound increase in blood flow to an organ after being occluded due to a shortage of oxygen and a build-up of metabolic waste.

External links

* [http://www.cvphysiology.com/Blood%20Flow/BF005.htm Active] and [http://www.cvphysiology.com/Blood%20Flow/BF006.htm reactive] hyperemia. Richard E. Klabunde, Ph.D. Cardiovascular Physiology Concepts. Accessed on 27 February 2006.


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  • hyperaemia — hyperaemia, hyperaesthesia, hyperaesthetic chiefly Brit var of HYPEREMIA, HYPERESTHESIA, HYPERESTHETIC * * * n. the presence of excess blood in the vessels supplying a part of the body. In active hyperaemia (arterial hyperaemia) the arterioles… …   Medical dictionary

  • Hyperaemia — Hy per*[ae] mi*a, n. [NL., fr. Gr. ype r over + a i^ma blood.] (Med.) A superabundance or congestion of blood in an organ or part of the body. [1913 Webster] {Active hyper[ae]mia}, congestion due to increased flow of blood to a part. {Passive… …   The Collaborative International Dictionary of English

  • hyperaemia — n. the presence of excess blood in the vessels supplying a part of the body. In active hyperaemia (arterial hyperaemia) the arterioles are relaxed and there is an increased blood flow. In passive hyperaemia the blood flow from the affected part… …   The new mediacal dictionary

  • hyperaemia — An excess of blood in a region of the body …   Dictionary of molecular biology

  • hyperaemia — /huy peuhr ee mee euh/, n. Pathol. hyperemia. * * * …   Universalium

  • hyperaemia — n. localized excess of blood (Medicine) …   English contemporary dictionary

  • hyperaemia — [ˌhʌɪpər i:mɪə] (US hyperemia) noun Medicine an excess of blood in an organ or other part of the body. Derivatives hyperaemic adjective …   English new terms dictionary

  • hyperaemia — /haɪpəˈrimiə/ (say huypuh reemeeuh) noun an increase in the blood in any part of the body. Also, Chiefly US, hyperemia. {New Latin. See hyper , emia} –hyperaemic, adjective …  

  • hyperaemia —   n. excess of blood in a part.    ♦ hyperaemic, a …   Dictionary of difficult words

  • hyperaemia — n. (US hyperemia) an excessive quantity of blood in the vessels supplying an organ or other part of the body. Derivatives: hyperaemic adj. Etymology: mod.L (as HYPER , AEMIA) …   Useful english dictionary

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