a rapid, uncoordinated series of contractions of a muscle; esp., such contractions of some portion of the heart muscle, causing irregular heartbeats and sometimes ineffectual pumping of blood
Origin of fibrillationfrom fibril + -ation: with reference, refer to fibers of the heart muscle
- The forming of fibers.
- a. Fine, rapid twitching of individual muscle fibers with little or no movement of the muscle as a whole.b. Rapid uncoordinated twitching movements that replace the normal rhythmic contraction of the heart and may cause a lack of circulation and pulse.