[HiTech RedNeck]

What laymen generally call a heart attack is caused by myocardial infarction or coronary article obstruction. The flow of blood to the heart muscle is stopped or impeded and is the reason the heart quits or goes into erratic ineffectual rhythm. A cardiac arrest can happen without this.

[Graymatter]

I'm reposting this for you HiTech, nobody else has answered yet afaik (I'm reading as fast as I can...)
Would appreciate if you could shed any light here:

Hammesfahr definitely said that potassium wasn't the issue and there was NO heart attack.
Couple of q's for the MD's here. Is there a difference between heart attack and cardiac arrest? Can either condition be determined by blood tests hours/days later? Would potassium levels remain low hours after a heart attack or cardiac arrest? If low K can cause cardiac arrest, what about the converse---can cardiac arrest cause low K? If they determined at the hospital that Terri had both a cardiac arrest AND low K, how did they know which came first?