Is cardiac arrest a painful way to go?

No

Heart_attack
people who experience cardiac arrest usually lose consciousness very rapidly so in general would not feel a lot of pain.
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Heart attack Cardiac arrest Pain Consciousness Cardiac Heart

Maybe

Heart
If cardiac arrest is the result of infarction the angina associated with the event can be painful. If cardiac arrest is due to an arrhythmia you might pass out before noticing what even happened. In between these two extremes there is a huge range of symptoms.
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Heart attack Cardiac arrest Large sinuses Angina Pain Infarction Cardiac Heart