1. Act or process of forming fibrils.
2. Muscular twitching involving individual muscle fibers acting without coordination.
Rapid and disordered beating of a section of heart muscle. It may occur in different chambers of the heart. Atrial fibrillation, producing a rapid, chaotic heartbeat, occurs in a number of conditions, including atherosclerosis, rheumatic heart disease and hyperthyroidism. Ventricular fibrillation causes cardiac arrest; it occurs mostly after a heart attack. + prikaži više