Fig. 2. Comparison of IMR according to clinical and angiographic factors. ^*The IMR of patients with symptom-onset-to-balloon time of >180 minutes was significantly higher than the IMR of those with a symptom-onset-to-balloon ≤180 minutes, ^†The IMR was significantly higher in proximal lesion than in non-proximal lesion, ^‡The IMR was significantly higher in initial TIMI 0/1 group, as compared initial TIMI 2/3. IMR, index of microcirculatory resistance; LAD, left anterior descending artery; LCX, left circumflex artery; RCA, right coronary artery; P, proximal location of culprit artery; NP, non-proximal location of culprit artery; TIMI, thrombolysis in myocardial infarction.