Which arrhythmia is characterized by chaotic, irregular electrical activity in the atria?

Atrial fibrillation is characterized by chaotic, irregular electrical activity in the atria. In this arrhythmia, the normal rhythmic contractions of the atria are replaced by rapid and disorganized electrical impulses. This results in an irregular and often rapid heart rate, where the heart cannot effectively pump blood, potentially leading to various complications like stroke or heart failure.

In atrial fibrillation, the disorganized electrical activity prevents coordinated contraction of the atrial muscles, causing the atria to quiver rather than contract effectively. This sets the condition apart from other arrhythmias like ventricular tachycardia, which primarily involves the ventricles and is characterized by a fast and coordinated rhythm, or supraventricular tachycardia, which is a faster rhythm originating above the ventricles but is more regular than atrial fibrillation. Bradycardia features a slower than normal heart rate and does not involve the chaotic rhythm characteristic of atrial fibrillation.

Understanding the specific mechanisms and characteristics associated with atrial fibrillation is vital for recognizing symptoms, diagnosis, and treatment options in clinical practice.