Which of the following cardiac arrhythmias is most serious and needs immediate medical attention and emergency treatment to prevent sudden death?

Question

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Ventricular fibrillation is an emergency condition that requires immediate attention to prevent serious complications such as myocardial infarction, anoxic brain damage, and sudden death. Complications of chronic atrial fibrillation are thromboembolism and stroke. Uncomplicated atrial flutter seldom causes serious complications.

Which of the Following Cardiac Arrhythmias Is Most Serious and Needs