What does “Lead II” primarily monitor on an EKG?

Lead II is primarily used to monitor the overall rhythm and conduction system of the heart because it provides a consistent view of the heart's electrical activity as it travels through the atria and ventricles. This lead is particularly effective in capturing the electrical impulses originating from the sinoatrial (SA) node, allowing for the assessment of the heart's rhythm and any conduction disturbances.

The monitoring provided by Lead II is invaluable in identifying the basic rhythm of the heart and any arrhythmias that may occur. The continuous monitoring of these aspects aids healthcare professionals in making timely and informed decisions regarding patient care.

While other leads may provide insights related to specific areas of the heart or particular physiological aspects, Lead II's design prioritizes a clear depiction of the heart's rhythm and its overall conduction pathways, making it a fundamental lead for monitoring cardiac electrical activity.