What is the typical atrial rate in atrial fibrillation?

In atrial fibrillation, the typical atrial rate is characterized by rapid and irregular electrical activity in the atria, often leading to a significant increase in heart rate. The correct response indicates that the atrial rate can exceed 350 beats per minute, which is a common finding in this condition. This fast and chaotic atrial activity results from multiple ectopic foci firing in the atria, creating a disorganized rhythm that prevents effective contraction of the atrial chambers.

Understanding that atrial fibrillation can lead to rates well over 350 bpm is crucial for recognizing the condition and its implications for patient management. This rapid atrial activity can contribute to the risk of thrombus formation and other complications associated with the erratic heart rhythm.

Other options indicated lower atrial rates, which do not accurately reflect the nature of atrial fibrillation. These misconceptions emphasize the need for clear recognition of the hallmark features of atrial fibrillation, particularly its high atrial rate.