Ventricular Fibrillation (VF)

Ventricular fibrillation represents the most critical cardiac arrhythmia, characterized by rapid, disorganized electrical activity in the ventricles—the heart's lower chambers. Instead of coordinated contractions, the ventricles quiver uselessly, rendering the heart unable to pump blood to vital organs. This leads to immediate collapse, unconsciousness, and death within minutes if untreated.
Common triggers include myocardial infarction, coronary artery disease, cardiomyopathy, electrolyte imbalances (e.g., hypokalemia), drug toxicity, or chest trauma. Ischemia from blocked coronary arteries disrupts normal conduction, while structural heart changes heighten susceptibility.
Diagnosis relies on ECG, revealing erratic, irregular waveforms without discernible QRS complexes. Immediate intervention is essential: CPR restores circulation temporarily, while defibrillation delivers a shock to reset sinus rhythm. Epinephrine and amiodarone support resuscitation per ACLS protocols.

Long-term management involves implantable cardioverter-defibrillators (ICDs), antiarrhythmic drugs, or revascularization (e.g., angioplasty). Risk factor control—smoking cessation, statins, beta-blockers—prevents recurrence. Early recognition via public AED access saves lives, emphasizing bystander training.
This ECG illustrates VF's hallmark irregular, wavy pattern, confirming the diagnosis in emergencies.