Ventricular fibrillation – ECG

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Ventricular fibrillation (VF)
Ventricular fibrillation (VF)

Ventricular fibrillation (VF) is a life threatening arrhythmia, which leads to death unless promptly corrected by electrical defibrillation (direct current or DC shock). Cardiopulmonary resuscitation (CPR) is initiated while the defibrillator is being made available. Automatic external defibrillators (AED) in public places have automatic diagnostic algorithms and gives audible prompts to the resuscitator so that shocks can be delivered even by the minimally trained persons. VF is recognized on the electrocardiogram (ECG) as a highly disorganized electrical activity. Each wave has a different morphology. When multiple simultaneous leads are available as in this case, it can be seen that the morphology is different between the leads as well. When the electrical activity is so disorganized, no ventricular contraction is possible and ventricle remains still in a state of cardiac arrest which leads to circulatory arrest and hypoxemia. Only a short time window of about four minutes is available for initiation of CPR, beyond which irreversible cerebral damage may ensue.

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