Understanding ECG Lead Placement and Waveform Interpretation #3505219 (License: Personal Use)

This illustration demonstrates the placement of three limb electrodes-right arm (RA), left arm (LA), and left leg (LL)-used for Lead I ECG recording. The monitor displays both a cross-sectional view of the human heart and a time-based voltage graph showing the P, Q, R, S, and T waves representing atrial depolarization, ventricular depolarization, and repolarization phases. The triangular Einthoven’s triangle configuration highlights the vector principles underlying lead derivation.

Used in medical education, cardiology training modules, or patient-facing health resources to explain basic ECG mechanics; targets users seeking foundational knowledge of electrocardiography, such as students, clinicians, or patients preparing for cardiac tests.