Where is the positive electrode positioned in Lead II in an EKG?

In Lead II of an electrocardiogram (EKG), the positive electrode is positioned on the left leg. This configuration creates a specific electrical pathway that allows the EKG to capture the heart's electrical activity as it travels from the right atrium, through the AV node, and into the ventricles.

Lead II is commonly used because it typically provides a good representation of the heart's electrical activity, reflecting the depolarization wave moving from the top of the heart to the bottom. The left leg as the positive electrode picks up this electrical activity effectively, showing the overall direction of the electrical impulses during the cardiac cycle.

The placement on the left leg enhances the visualization of certain arrhythmias and cardiac rhythms on the EKG, making it a standard lead used in clinical practice to monitor the heart's health.