If a patient who was attached to an ECG monitor suddenly went into cardiac​ arrest, the monitor would most likely show which ECG rhythm that is considered​ shockable?
A. Pulseless electrical activity or ventricular fibrillation
B. Bradycardia or ventricular tachycardia
C. Asystole or normal sinus rhythm
D. Ventricular fibrillation or ventricular tachycardia
