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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.