Give a stream of consciousness and then the final answer. Clinicians classify cardiac arrest into "shockable" versus "non -- shockable", as determined by the ECG rhythm. This refers to whether a particular class of cardiac dysrhythmia is treatable using defibrillation. The two "shockable" rhythms are ventricular fibrillation and pulseless ventricular tachycardia while the two "non -- shockable" rhythms are asystole and pulseless electrical activity.

Answer this question: what are the two shockable rhythms in cardiac arrest?
This is the relevant information: The two "shockable" rhythms are ventricular fibrillation and pulseless ventricular tachycardia while the two "non -- shockable" rhythms are asystole and pulseless electrical activity.
So, the final answer is ventricular fibrillation and pulseless ventricular tachycardia.