ring model

in cardiology, a model describing the mechanism of anatomical reentry, based on a circuit that is formed around an impenetrable barrier to propagation and contains a locus of slow conduction. The locus blocks the initial normal impulse but is traversed by later impulses from the opposite direction that reexcite normal cardiac fibers, which can occur repetitively. There must exist either a segment of slow conduction or overall slow conduction with a locus of unidirectional block, and total conduction time in the circuit must exceed the refractory period of the fibers so that an excitable gap exists between a wavefront head and the tail of that preceding. See also reentrant mechanism, under mechanism.

Medical dictionary. 2011.

Look at other dictionaries:

  • Toroidal ring model — The toroidal ring model, known originally as the Parson magneton or magnetic electron, is also known as the plasmoid ring, vortex ring, or helicon ring. This physical model treated electrons and protons as elementary particles, and was first… …   Wikipedia

  • concentric-ring model —   a theory of how urban land use develops over time. Developed by Earnest Burgess in 1924 to explain social patterns in Chicago, it was later proposed as a general theory of urban land use. It says that zones of transition, low, medium and high… …   Geography glossary

  • Model A — Sozionik (engl. Socionics; ein Kofferwort aus society (Gesellschaft) und bionics (Bionik)) ist eine psychologische Theorie zur Temperament Klassifizierung, die in den 1970ern von der Litauerin Aušra Augustinavičiūtė (Pseudonym Augusta ) in der… …   Deutsch Wikipedia

  • Model theory — This article is about the mathematical discipline. For the informal notion in other parts of mathematics and science, see Mathematical model. In mathematics, model theory is the study of (classes of) mathematical structures (e.g. groups, fields,… …   Wikipedia

  • Ring the Alarm — Infobox Single Name = Ring the Alarm Artist = Beyoncé Album = B Day Released = October 17, 2006 (U.S.) Format = CD single, digital download Recorded = Sony Music Studios (New York City, New York) Genre = R B, hip hop soul Length = 3:23 (album… …   Wikipedia

  • Model 500 telephone — Western Electric model 500 set made in 1951 By 1975, the Model 500 layout …   Wikipedia

  • Model aircraft — A die cast Boeing 747 400 model. Model aircraft are flying or non flying models of existing or imaginary aircraft using a variety of materials including plastic, diecast metal, polystyrene, balsa wood, foam and fibreglass. Flying designs range… …   Wikipedia

  • Ring Raiders — Articleissues citations missing = August 2008 refimprove = August 2008Infobox Television show name = Ring Raiders caption = format = Animated creator = DIC Entertainment Those Characters from Cleveland writer = Phil Harnage voices = Dan Gilvezan… …   Wikipedia

  • Model rocket — A typical model rocket during launch A model rocket is a small rocket that is commonly advertised as being able to be launched by anybody, to, in general, low altitudes (usually to around 100–500 m (300–1500 ft) for a 30 g (1 oz.) model) and …   Wikipedia

  • Ring theory — In abstract algebra, ring theory is the study of rings algebraic structures in which addition and multiplication are defined and have similar properties to those familiar from the integers. Ring theory studies the structure of rings, their… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.