What is a characteristic feature of atrial fibrillation?

Atrial fibrillation is characterized by rapid, disorganized electrical signals in the atria, resulting in erratic and often rapid heart rates. This leads to random contractions of the atrial muscles, which can be observed on an electrocardiogram (ECG) as an irregularly irregular rhythm. The absence of coordination in the atrial contractions means that they do not follow a regular pattern, distinguishing atrial fibrillation from other arrhythmias that may present with more predictable rhythms. The random nature of these contractions can lead to varying heart rate patterns, which can significantly impact the efficiency of the heart's pumping ability and may increase the risk of thrombus formation.

Recognizing this feature of atrial fibrillation is important for diagnosis and management, as it informs therapeutic strategies aimed at controlling the heart rate and reducing the risk of stroke associated with the condition.