1. The escape of fluid from the blood vessel s or lymphatics into the tissues or a cavity. 2. A collection of the fluid effused. [L. effusio, a pouring out]
- complex pleural e. a pleural e. without actual infection but with signs of a high degree of inflammation ( e.g., low pH, low glucose, high lactate dehydrogenase, many white cells).
- joint e. increased fluid in synovial cavity of a joint.
- loculated pleural e. pleural e. that is confined to one or more fixed pockets in the pleural space.
- middle-ear e. a condition in which the air in the middle ear has been replaced with serous or mucoid fluid as a consequence of otitis media. SYN: secretory otitis media, serous otitis media.
- parapneumonic e. pleural e. associated with pneumonia
- pericardial e. increased fluid within the pericardial sac; can cause circulatory compromise by compression of the heart; most often caused by inflammation, infection, malignancy, and uremia. SYN: dropsy of pericardium.
- pleural e. increased fluid in the pleural space; can cause shortness of breath by compression of the lung and/or increased intrathoracic pressure resulting in mediastinal shift and increased work of breathing; a transudative e. has low protein content and is usually due to heart failure, uremia, or hypoalbuminemia; an exudative e. has high protein and cell count and is due most often to inflammation, malignancy, or infection; an infected pleural e. is an empyema; a pleural e. associated with pneumonia is a parapneumonic e.; a pleural e. without actual infection but with signs of a high degree of inflammation ( e.g., low pH, low glucose, high lactate dehydrogenase, many white cells) is a complex pleural e. and is frequently associated with pneumonia; a loculated pleural e. is not free-flowing in the pleural space but rather confined to one or more fixed pockets. SYN: hydrothorax.
- subpulmonic e. a collection of fluid in the pleural space mostly located radiographically between the diaphragm and the basal surface of the lung.

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ef·fu·sion i-'fyü-zhən, e- n
1 a) the escape of a fluid from anatomical vessels by rupture or exudation
b) the flow of a gas through an aperture whose diameter is small as compared with the distance between the molecules of the gas
2) the fluid that escapes by extravasation see PLEURAL EFFUSION

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1. the escape of pus, serum, blood, lymph, or other fluid into a body cavity as a result of inflammation or the presence of excess blood or tissue fluid in an organ or tissue.
2. fluid that has escaped into a body cavity.

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ef·fu·sion (ə-fuґzhən) [L. effusio a pouring out] 1. the escape of fluid into a part or tissue, as an exudation or a transudation. 2. an effused material, which may be classified according to protein or cellular content as an exudate or transudate.

Medical dictionary. 2011.

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  • effusion — [ efyzjɔ̃ ] n. f. • av. 1150; lat. effusio, de effundere « répandre » 1 ♦ Vx Action de répandre (un liquide). Mod. EFFUSION DE SANG : action de faire couler le sang (dans une action violente). L ordre a été rétabli sans effusion de sang. 2 ♦… …   Encyclopédie Universelle

  • Effusion — Ef*fu sion, n. [L. effusio: cf. F. effusion.] 1. The act of pouring out; as, effusion of water, of blood, of grace, of words, and the like. [1913 Webster] To save the effusion of my people s blood. Dryden. [1913 Webster] 2. That which is poured… …   The Collaborative International Dictionary of English

  • effusion — Effusion. s. f. Espanchement. L effusion du vin dans les sacrifices. il y eut une grande effusion de sang. il se fait dans la joye une grande effusion d esprits. On dit au figuré, Effusion de coeur, pour dire, Cordialité, Grande demonstration d… …   Dictionnaire de l'Académie française

  • effusion — EFFUSION. subs. f. Épanchement. L effusion du vin dans les Sacrifices. Il y eut une grande effusion de sang dans ce combat. [b]f♛/b] On dit aussi au figuré, Effusion de coeur, pour dire, Vive et sincère démonstration de confiance et d amitié …   Dictionnaire de l'Académie Française 1798

  • effusion — c.1400, a pouring out, from M.Fr. effusion (14c.) and directly from L. effusionem (nom. effusio) a pouring forth, noun of action from pp. stem of effundere pour forth, spread abroad, from ex out (see EX (Cf. ex )) + fundere pour (see FOUND …   Etymology dictionary

  • effusion — d eaue, Effusio aquae. Il y eut plus grande effusion de sang au combat, Plus sanguinis in ipsa dimicatione factum …   Thresor de la langue françoyse

  • Effusion — (lat.), Ausströmung, Erguß; besonders das Ausfließen von Gasen aus einem sie rings umschließenden Gefäß, in dessen Wand eine Öffnung angebracht ist. Hierbei ist das Quadrat der Ausströmungsgeschwindigkeit dem Druck direkt und dem spezifischen… …   Meyers Großes Konversations-Lexikon

  • Effusion — nennt man die Diffusion von im Dissoziationszustand befindlichen Gasen durch poröse Diaphragmen, wobei im allgemeinen eine teilweise Trennung der Dissoziationsprodukte erfolgt, da deren Ditfusion unabhängig voneinander vor sich geht. Auf der… …   Lexikon der gesamten Technik

  • effusion — index expulsion, harangue, issuance, outflow, prolixity Burton s Legal Thesaurus. William C. Burton. 2006 …   Law dictionary

  • effusion — [n] outpouring address, diffusion, discharge, effluence, effluvium, efflux, emanation, emission, exudate, gush, gushing, ooze, outflow, pouring, shedding, stream, verbosity, wordiness; concepts 179,266 …   New thesaurus

  • effusion — ► NOUN 1) an instance of giving off a liquid, light, or smell. 2) Medicine an escape of fluid into a body cavity. 3) an instance of unrestrained speech or writing. DERIVATIVES effuse verb. ORIGIN Latin, from effundere pour out …   English terms dictionary

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