The myocardial salvage index was assessed by single photon emission computed tomography with ( @ - ) I -- methyl-iodophenylpentadecanoic acid ( ischemic area-at-risk at onset of STEMI : AAR ) and ( @ - ) thallium scintigraphy ( area-at-infarction at @ months : AAI ) -LSB- myocardial salvage index = ( AAR-AAI ) @/AAR ( % ) -RSB- .