What is the primary purpose of an electrode in an ECG?

The primary purpose of an electrode in an ECG is to pick up electrical impulses given off by the heart. During each heartbeat, the heart generates electrical signals that initiate contraction and relaxation of the heart muscles. Electrodes placed on the skin detect these tiny electrical changes and convert them into a readable electrical signal, which is then recorded as an electrocardiogram.

By capturing the heart's electrical activity, electrodes enable healthcare providers to analyze its rhythm, detect abnormalities, and diagnose various cardiac conditions. This non-invasive method is essential for monitoring the heart's health and functioning, making it a cornerstone of cardiovascular diagnostics. The successful interpretation of an ECG relies heavily on the accurate placement and function of these electrodes.