Acute MI assessments
| Imaging data | |||
|---|---|---|---|
| CMR imaging | Initial CMR (n=21) | Follow-up CMR (n=17) | p Value |
| MI to CMR (days) | 13±5 | 287±37 | <0.01 |
| LVEF (%) | 52±9 | 55±8 | <0.01 |
| Indexed LV mass (g/m2) | 85±20 | 74±13 | <0.01 |
| LVEDV (mL/m2) | 80±18 | 82±16 | 0.88 |
| LVESV (mL/m2) | 39±14 | 38±12 | 0.36 |
| Wall motion index | 0.40±0.20 | 0.22±0.15 | <0.01 |
| ECV (%) | 34±4 | 33±2 | 0.58 |
| Infarct size (g/m2) | 13 (7–17) | 6 (3–14) | 0.03 |
| PET imaging | |||
| Initial PET/CT (n=21) | Repeat PET/CT (n=17) | ||
| MI to PET (days) | 12±4 | 76±19 | <0.01 |
| Total LV uptake (TBRmean) | 0.82±0.18 | 0.85±0.18 | 0.96 |
| Myocardial infarct uptake (TBRmean) | 1.34±0.22 | 1.20±0.21 | 0.02 |
| Remote myocardial uptake (TBRmean) | 0.85±0.17 | 0.82±0.15 | 0.38 |
| Segmental uptake (TBRmean) and regional WMI | |||
| Normal function (0) | 0.80±0.26 | 0.83±0.23 | 0.14 |
| Mild-mod hypokinesia (1) | 0.89±0.33 | 0.97±0.29 | 0.33 |
| Severe hypokinesia (2) | 0.97±0.28 | 0.91±0.34 | 0.47 |
| Akinesia (3) | 0.77±0.21 | 0.73±0.24 | 0.66 |
| Dyskinesia (4) | – | – | – |
| Segmental uptake and transmurality of MI (TBRmean) | |||
| No infarct | 0.75±0.23 | 0.81±0.23 | NA |
| Subendocardial infarct (1–75%) | 0.95±0.29 | 1.08±0.28 | NA |
| Transmural infarct (76–100%) | 0.89±0.29 | 0.88±0.27 | NA |
Mean±SD or median (IQR).
CMR, cardiac magnetic resonance; ECV, mean extracellular volume; LV, left ventricle; LVEDV, LV end diastolic volume; LVEF, LV ejection fraction; LVESV, LV end systolic volume; MI, myocardial infarction; PET, positron emission tomography; TBRmean, mean tissue-to-background ratio; WMI, wall motion index.