fibrillation (fI-bri-la´shun, fib-rI-)

1. The condition of being fibrillated. 2. The formation of fibrils. 3. Exceedingly rapid contractions or twitching of muscular fibrils, but not of the muscle as a whole. 4. Vermicular twitching, usually slow, of individual muscular fibers; commonly occurs in atria or ventricles of the heart as well as in recently denervated skeletal muscle fibers.
atrial f. , auricular f. f. in which the normal rhythmical contractions of the cardiac atria are replaced by rapid irregular twitchings of the muscular wall; the ventricles respond irregularly to the dysrhythmic bombardment from the atria.ataxia cordis;
ventricular f. coarse or fine, rapid, fibrillary movements of the ventricular muscle that replace the normal contraction.


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