Which of the following is a lethal arrhythmia?

Question

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Ventricular fibrillation is a lethal arrhythmia as it causes the heart to quiver instead of contracting effectively, leading to a lack of blood flow to the body's organs and tissues. This condition can quickly lead to cardiac arrest and death if not treated promptly. Atrial fibrillation and tachycardia are not always life-threatening but may require medical attention. Bradycardia is a slow heart rate and may not necessarily be lethal on its own, but it can lead to complications in some cases.

Which of the Following Is a Lethal Arrhythmia