Final answer:
Einthoven's Triangle is made up of Lead I, Lead II, and Lead III, which are used to measure the heart's electrical activity by creating an equilateral triangle with electrodes placed on the arms and leg. Each lead measures the voltage differences between pairs of these points, helping to diagnose cardiac conditions.
Step-by-step explanation:
The leads that make up Einthoven's Triangle are Lead I, Lead II, and Lead III. This configuration is fundamental in electrocardiography (ECG) and forms an equilateral triangle with the heart at the center, allowing for the measurement of the heart's electrical activity from different angles. Einthoven's Triangle is used extensively to understand the vectorial nature of heart depolarization and diagnose various cardiac conditions. The electrodes, labeled RA (right arm), LA (left arm), and LL (left leg), measure the electrical potential difference between each pair, giving rise to the aforementioned leads recorded in an ECG.
For example, Lead I measures the difference between the left arm (LA) and the right arm (RA), while Lead II measures the difference between the left leg (LL) and the right arm (RA), and Lead III measures the difference between the left leg (LL) and the left arm (LA). Together, they provide comprehensive information about the direction and magnitude of the heart's depolarization wave, which can indicate the presence of infarcts or subtle changes in heart tissue integrity.