ECG Mechanism
Synchronize excitation, repolarization, the cardiac vector, lead-axis projection, and all 12 leads with a rotatable 3D heart. Break down one lead or compare two to see why each waveform takes its shape.
ECG Vector
3D Cardiac Lead Simulator
Every ECG shape has a reason. Connect 3D cardiac activation, ions and action potentials, and the features of representative ECG patterns—then check your understanding with quizzes.
Four workspaces
Understand the ECG from four angles.
Choose a workspace from the top tabs on Mac and iPad, or from the feature menu shown at launch on iPhone.
Ion & ECG
Adjust major ion currents and extracellular K⁺, ionized Ca²⁺, Na⁺, and H⁺ (pH). Watch the ventricular action potential and ECG while exploring changes from baseline and links to conditions. Cellular calculations are shown separately from whole-heart estimates.
ECG & Conditions
Compare Adult Normal with a representative pattern in one lead or all 12 leads. A common time scale and explanations of the ECG features and their mechanisms help you see what changed—and why.
Learn & Quiz
Identify a representative model from 12 leads and a rhythm strip. After answering, review the findings and their mechanisms, then explore them in the simulator.
Conditions and physiological differences
Explore illustrative bundle block, atrial fibrillation, LVH strain, and regional ST elevation, alongside a normal child around age five, fever-related sinus tachycardia, and a higher-BMI body-habitus reference.
Slow playback and stepping
Slow time to 0.05×, pause, scrub, or step by 10 ms. Manage visible structures and heart opacity from one display panel.
Mac, iPhone, and iPad
Larger text and controls, with clearer layouts throughout. On iPhone, use the feature menu and back button, and keep the ECG visible while adjusting ions. The interface supports 10 languages, including Japanese and English.
In the app
3D, explanation, and waveform in one view.
Free
Try every core workspace
Use Adult Normal and Right Bundle Branch Block, all 12 standard ECG leads, fixed standard electrode positions, comparison and quiz samples, favorites, and four guided Ion & ECG examples.
ECG Vector Pro
One purchase, broader exploration
This is not a subscription. Unlock free adjustment of ion currents, extracellular ions, and pH with synchronized 12-lead response, pediatric and other condition examples, custom leads, electrode editing and misplacement presets, and the complete comparison and quiz libraries.