You arrive at the scene shortly after a 55-year-old man collapsed. Two bystanders are performing CPR. The man's wife states that he had cardiac by-pass surgery approximately 6 months earlier. There are no signs of trauma. After you attach the AED and analyze this patient's heart rhythm, the machine states, "shock advised." What cardiac rhythm is the patient most likely in?
A. Asystole
B. Ventricular fibrillation
C. Ventricular tachycardia
D. Pulseless electrical activity
Answer: B. Ventricular fibrillation
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