09/21/2025
Einthoven's triangle is a concept in electrocardiography (ECG) that refers to the three limb leads that are used to record the heart's electrical activity.
The three limb leads of Einthoven's triangle are the standard bipolar leads, which are placed on the right arm, left arm, and left leg. By recording the electrical activity of the heart from these three points, the ECG machine can create a graphical representation of the heart's electrical activity, which can be used to diagnose various cardiac conditions.
Lead I looks from the right upper extremity to the left upper extremity, allowing for a lateral view of the left ventricle and left atrium.
Lead II looks from the right upper extremity to the left lower extremity, allowing for an inferior view of the left and right ventricle.
Lead III looks from the left upper extremity to the left lower extremity and allows for an inferior view of the right and left ventricles
