What is a common cause of atrial fibrillation?

Atrial fibrillation is a complex arrhythmia often associated with various underlying cardiovascular conditions. One of the most recognized causes is coronary artery disease (CAD). This condition arises when the coronary arteries become narrowed or blocked due to plaque buildup, which can lead to ischemia (decreased blood flow to the heart).

In the context of atrial fibrillation, CAD can increase the risk of developing this arrhythmia because reduced blood flow can lead to scarring and structural changes in the heart's atria. These changes predispose the atrial tissue to become electrically unstable, ultimately resulting in the erratic electrical activity characteristic of atrial fibrillation.

While other options like high blood pressure and electrolyte imbalances can also contribute to atrial fibrillation, coronary artery disease stands out due to its direct relationship with ischemic events affecting the atria. Excessive hydration is typically not a recognized cause of atrial fibrillation and can sometimes lead to other complications.