What is the basic rule of electrocardiography?

The basic rule of electrocardiography centers around the movement of electrical impulses in the heart as they relate to the placement of electrodes. When an electrical impulse flows toward a positive electrode, it generates an upright deflection on the electrocardiogram (EKG). This is because the electrocardiogram records the electrical activity of the heart, and the orientation of the flow of current in relation to the electrodes determines how this activity is represented on the graph.

When the impulse moves toward the positive electrode, it creates a positive deflection, showing that the heart is depolarizing in that direction. This depolarization is essential for understanding heart rhythm and electrical conduction, allowing for accurate assessment and diagnosis of various cardiac conditions. Understanding this fundamental principle is crucial as it serves as the foundation for interpreting EKGs and identifying abnormalities in heart function.