How is the horizontal axis on an EKG graph defined?

The horizontal axis on an EKG graph is defined as time. This axis represents the progression of time, allowing healthcare professionals to assess the timing of electrical impulses in the heart. Each small box typically represents 0.04 seconds, while larger boxes may represent 0.20 seconds. By using time as the horizontal measure, medical staff can analyze the rhythm and rate of the heart effectively, identifying any irregularities in the electrical conduction system of the heart, such as arrhythmias or other cardiac conditions. The timing information is crucial for interpreting various segments and intervals on the EKG, such as the P wave, QRS complex, and T wave, which are essential for diagnosing specific heart issues.