What is the difference between a heart seizure and a heart attack?

Heart attack: Never heard of a heart seizure. There is a term heart attack which is due to blockage of an artery supplying the heart muscle. It results in death of heart tissue.

Laymen terms: Heart attack and heart seizure are general laymen terms. Heart attack refer to the injury of heart muscle due to blockage of one of the vessels in the heart - ischemia. Heart seizure refer to the heart arrhythmia - irregular heart beat, which sometimes can lead to cardiac arrest ( like ventricular fibrillation ).