Which condition is characterized by atria being in a quivering state, risking blood clot formation?

Atrial fibrillation is characterized by the atria's rapid and irregular quivering. This chaotic electrical activity prevents the atria from contracting effectively, which can lead to stagnant blood flow within those chambers. When blood pools in the atria due to this ineffective contraction, it increases the risk of thrombosis, or blood clot formation. These clots can potentially dislodge and travel to other areas of the body, particularly the brain, leading to serious complications such as a stroke. Therefore, the hallmark of atrial fibrillation is the quivering state of the atria, which significantly impacts blood flow and increases the risk of clot formation.