What does the term "isoelectric line" mean?

The term "isoelectric line" refers to the baseline on an EKG where there is no electrical activity detectable in the heart. On an electrocardiogram, this line represents a state of equilibrium, meaning that there are no net electrical forces acting in any direction at that moment. It serves as a reference point for measuring the amplitude of the various waves and segments that appear on the EKG, such as the P wave, QRS complex, and T wave. Understanding the isoelectric line is crucial for interpreting the EKG accurately, as any deviations from this line indicate electrical activity related to cardiac function, such as depolarization and repolarization of the heart muscle.