What is counted to obtain an atrial rate?

To determine the atrial rate, the focus is on the P waves on an electrocardiogram (EKG). The P wave represents atrial depolarization, which is the electrical activity that stimulates the atria to contract. By counting the number of P waves over a given time interval, usually measured in a minute, healthcare professionals can accurately calculate the atrial rate.

This is important for diagnosing and managing various cardiac conditions, such as atrial fibrillation or atrial flutter, where the atrial rate may be significantly altered. Counting the P waves ensures that the assessment reflects the true electrical activity of the atria, which is crucial for understanding the overall cardiac rhythm and function.