fibrillation

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fibrillation

1. a local and uncontrollable twitching of muscle fibres, esp of the heart, not affecting the entire muscle. Atrial fibrillation results in rapid and irregular heart and pulse rate. In ventricular fibrillation, the heart stops beating
2. irregular twitchings of the muscular wall of the heart, often interfering with the normal rhythmic contractions
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Fibrillation

 

the destruction by mechanical action of the bonds between the tiny fibers (fibrils and microfibrils) making up the cell walls of plant fibers and the penetration by water of the space between the fibrils.

Fibrillation may occur both on the surface of and within the cell wall of the fibers. With surficial fibrillation fragments of fibrils and the cell wall are separated from the fibers and form a nap on the fibers. With internal fibrillation the weakening and partial destruction of the bonds between fibrils increase the flexibility and plasticity of the fibers. Internal fibrillation enables the fibers to form bonds without losing strength. Fibrillation, the main process in beating cellulose during paper production, increases the surface of the fibers and releases the hemicelluloses inside the fibers, making it possible for the hemicelluloses to take part in the formation of bonds between fibers in the sheet of paper. The splitting of the fibrils establishes conditions for improved intertwining of fibers, increasing the mechanical strength of the paper sheet yet reducing the absorbency. Rolls, conical and disk mills, and similar devices are used for fibrillation.

REFERENCE

Ivanov, S. N. Tekhnologiia bumagi, 2nd ed. Moscow, 1970.

G. A. IVANOV

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

fibrillation

[‚fib·rə′lā·shən]
(physiology)
An independent, spontaneous, local twitching of muscle fibers.
(textiles)
A process in which yarn is extruded as a ribbon or a tape rather than as a fine filament.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Obesity is also a well-known risk factor for atrial fibrillation. Garnvik's study showed that people with a Body Mass Index (BMI) greater than 30 have a significantly higher risk than normal weight individuals.
He further explained that obese people who exercised a lot were able to limit the increase in risk to no more than approximately 50 per cent, which suggests that physical activity is good for limiting the increased risk of atrial fibrillation in obese people.
The basic tenets underlying a tailored strategy are that all atrial fibrillation is not the same, the less ablation the better, and a "one size fits all" approach would mean that some patients get more ablation than they need and others don't get enough, Dr.