Which type of arrhythmia is characterized by disorganized electrical activity in the heart?

Atrial fibrillation is an arrhythmia characterized by disorganized electrical activity in the heart. In this condition, the atria experience chaotic electrical signals, leading to irregular and often rapid heartbeats. This disorganization can result in ineffective contractions of the atria, potentially leading to blood pooling and increasing the risk of thrombus formation. The erratic nature of these electrical impulses prevents the heart from maintaining a steady rhythm, which is a hallmark of this specific arrhythmia.

Bradycardia refers to a slower than normal heart rate and does not involve the disorganized activity seen in atrial fibrillation. Ventricular tachycardia involves a fast rhythm originating from the ventricles but is characterized by more organized electrical impulses compared to atrial fibrillation. Supraventricular tachycardia also involves rapid heart rates but typically has a more organized conduction pattern than that observed in atrial fibrillation. Therefore, atrial fibrillation distinctly exemplifies disorganized electrical activity within the heart, marking it as the correct answer in this context.