Myocardial damage determined by CMR demonstrated a graded relationship of infarct size ( median ( IQR ) 13.3 ( 6.2-20 .3 ) % LV vs 13.7 ( 7.6-21 .3 ) % LV vs 22.5 ( 15.6-31 .2 ) % LV , p < 0.001 ) , the myocardial salvage index ( 60.8 ( 37.0-84 .5 ) vs 55.0 ( 36.6-73 .9 ) vs 42.7 ( 26.2-58 .2 ) , p < 0.001 ) , and microvascular obstruction ( 0.0 ( 0.0-0 .9 ) % LV vs 0.0 ( 0-1 .0 ) % LV vs 1.2 ( 0.0-3 .6 ) % LV , p < 0.001 ) across the three groups .