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ECG Findings

  • Chaotic, irregular deflections without clear P waves, QRS complexes, or T waves

  • Rate up to 600 bpm


  1. This rhythm is not compatible with effective cardiac output; hence, the patient will be in pulseless cardiac arrest. Immediate defibrillation is indicated.

  2. Given the above, ventricular fibrillation should generally not be identified on ECG, but rather by rhythm strip and clinical picture (similar to the principle of tension pneumothorax on chest x-ray). The examples seen here were obtained when patients receiving continuous ECG monitoring fibrillated during stress testing.

  3. Amplitude of deflections often decreases over time (coarse or fine ventricular fibrillation).


Ventricular Fibrillation. (ECG contributor: Frank G. Yanowitz, MD. Used with permission from Frank G. Yanowitz, MD at the ECG Learning Center [].)


Note the chaotic baseline with no discernable complexes. Immediate defibrillation is indicated. (ECG contributor: Jason Winter. Used with permission from

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