fibrillate
/ˈfaɪbrəleɪt/
verb
- To quiver or twitch rapidly, especially in a disordered way (used mainly of heart muscle fibers).
- In severe cases, the heart can fibrillate and stop circulating blood.
- The doctor explained that if the atria fibrillate, blood may not pump efficiently.
- During a heart attack, parts of the heart muscle may fibrillate instead of beating normally.