Describe ventricular fibrillation.

Describe ventricular fibrillation.

• A. Chaotic, irregular rhythm that is life-threatening
• B. Regular, rapid rhythm that is stable
• C. Slow but regular rhythm
• D. Rhythm that does not affect mortality

Answer: (A)

Ventricular fibrillation is a chaotic, disorganized electrical activation of the ventricles, so they quiver instead of contracting in a coordinated way. This produces an irregular, rapid rhythm with no recognizable P waves or QRS complexes on the ECG and, crucially, no effective cardiac output. It is instantly life-threatening because perfusion to the brain and organs stops within minutes unless rapid defibrillation and CPR are provided. So the best description is a chaotic, irregular rhythm that is life-threatening. By contrast, a regular rapid rhythm would suggest a different arrhythmia (like ventricular tachycardia that might be stable if there’s a pulse), a slow but regular rhythm is bradycardia, and a rhythm that supposedly doesn’t affect mortality isn’t consistent with VF.

Ventricular fibrillation is a chaotic, disorganized electrical activation of the ventricles, so they quiver instead of contracting in a coordinated way. This produces an irregular, rapid rhythm with no recognizable P waves or QRS complexes on the ECG and, crucially, no effective cardiac output. It is instantly life-threatening because perfusion to the brain and organs stops within minutes unless rapid defibrillation and CPR are provided. So the best description is a chaotic, irregular rhythm that is life-threatening. By contrast, a regular rapid rhythm would suggest a different arrhythmia (like ventricular tachycardia that might be stable if there’s a pulse), a slow but regular rhythm is bradycardia, and a rhythm that supposedly doesn’t affect mortality isn’t consistent with VF.