Following successful atrial depolarization, the electrical impulse is further conducted via the AV node, the bundle of His and the bundle branches. The individual components of conduction, however, cannot be visualized in the superficial ECG. The time from the end of the P wave to formation of the QRS complex is equated with a simplified explanation of rhythm disorder in the AV node-His-bundle branch region. A dashed line () is always used in the diagrams to indicate pathological conduction, otherwise a solid line (\) is employed.