Q vs. non-Q
When a heat attack causes a full thickness ("transmural") heart attack
, the ekg reveals the resulting scar by inscribing a "q" wave in the leads that correspond to the damaged area.
If the heart attack was not transmural or occurred in an area not seen well on ekg, there may be no q waves. If you had no symptoms at the time of the heart attack (25-50% of all attacks), it will be "unrecognized.".