SignificanceofECGChangesinAcuteMyocardialInfarctionSTsegmentelevationisconsideredbymostasasignofanoccludedcoronaryarteryandmyocardialischemia.CoronaryarteryocclusionusuallyisthecauseoftheacuteinfarctioninthepatientwiththattypeofECG.PatientswithacutemyocardialinfarctionwhodonotshowSTsegmentelevationyetleaktroponin,stillhaveamyocardialinfarction.