Example of ventricular fibrillation, a deadly cardiac arrhythmia if not treated within minutes

Simulation and electrocardiogram corresponding to the heart's normal sinus rhythm. The atrial contraction is initiated by the depolarization wave (shown in yellow), which originates from the sinoatial node and corresponds to the P wave on the ECG. After a delay passing through the atrioventricular node, the activation passes to the ventricles and produces a contraction. The QRS complex indicates ventricular depolarization (shown in yellow), while the T wave corresponds to ventricular repolarization.


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