3D Cardiac Lead Simulator
Every ECG shape has a reason. Compare lead projections in 3D and 2D, explore ions, ventricular action potentials, and cardiac rhythm in separate experiments, then investigate waveform differences with condition comparisons and quizzes.
Version 1.3 is available on the App Store. Explore all six learning workspaces on Mac, iPhone, and iPad.
Six workspaces
Choose a workspace from the top tabs on Mac and iPad, or from the feature menu shown at launch on iPhone.
A clearer 3D cutaway distinguishes atrial activation from ventricular conduction. Compare projections on the lead axes with new 2D vector diagrams and synchronized traces. Switch between one, two, or 12 leads, choose leads beside the 3D view, and resize the 3D and waveform panels.
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.
Observe synchronized membrane voltage, ion currents, and gates in the Luo–Rudy I model. Pause at the sodium-current peak. The standard model and stimulus adjustment are free; conductance adjustment, suppression experiments, and standard-trace comparison are included in Pro.
Follow activation timing from the sinus node through the atria, AV node, Purkinje fibers, and ventricle. Adjust sinus cycle, conduction speed, and AV delay. All features, including schematic bradycardia, tachycardia, and AV-block examples, are free.
Compare Adult Normal with representative patterns in one or 12 leads and learn their features and mechanisms. Explore bundle block, atrial fibrillation, LVH, and ST changes, plus reference examples for a child around age five, fever-related heart-rate increase, and higher BMI.
Identify a representative model from 12 leads and a rhythm strip. Review the findings and their mechanisms after answering, then explore them in the simulator. Wider screens show waveforms, answers, and explanations together.
In the app
Free
Use Adult Normal and Right Bundle Branch Block, all 12 standard leads, fixed standard electrodes, comparison and quiz samples, favorites, and four guided Ion & ECG examples. The standard ventricular action-potential model, stimulus adjustment, and all Cardiac Rhythm features are also free.
ECG Vector Pro
Your existing Pro purchase includes custom ion-current, extracellular-ion, and pH adjustments with synchronized 12-lead response, pediatric and other patterns, custom leads, electrode editing and misplacement, the full comparison and quiz libraries, plus ventricular conductance adjustment, suppression experiments, and standard-trace comparison. Existing Pro owners need no additional purchase or subscription.