3D heart · activation wavefront & dipole
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Wavefront
Depolarized
At rest
Infarct territory
Scar (old MI)
Dipole vector & loop
A live 12-lead ECG for residents. Choose a diagnosis, measure with calipers, then give antiarrhythmics or shock the simulated patient and watch the tracing respond.
Combine a rhythm with any conduction, chamber, ischemia and electrolyte findings. Every layer changes the cardiac dipole, so the 12 leads, vectors and 3D heart update together.
Badges rate each drug for the current tracing. Pick one to read about it, then give it to the patient. The action potential plot shows where the drug works.
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The arrow is the heart's instantaneous dipole. Each lead records its projection onto that lead's axis: positive when it points toward the lead's positive pole. Loops trace the P, QRS and T vectors; the dashed line is the mean QRS axis.
Teaching simulation. Waveforms come from a simplified cardiac dipole projected onto the 12 lead axes, so they reproduce the patterns but not every real-world detail. Content last reviewed October 2026 against AHA ACLS, the 2023 ACC/AHA/ACCP/HRS AF guideline, the 2025 ACC/AHA ACS guideline and the 2024 ESC AF guideline; always check current guidelines and local protocols. Not for clinical decisions.