ResultsCharacteristics of the Study ParticipantsA total of 300 of 343 screened participants referred for emergency percutaneous coronary intervention underwent 1.5-T cardiac MRI 2.2 days ± 1.9 (standard deviation) after hospital admission (Fig 1). Among the 300 study participants, 261 (87%) underwent DENSE imaging, whereas all participants (100%) underwent cine imaging. Thirty-nine (13%) participants did not undergo DENSE imaging, either because the method was unavailable (15 of 300, 5%) or because of intolerance of the cardiac MRI examination (24 of 300, 8%) (Fig 1). The mean age for male participants (198 of 259, 76%) was 58 years ± 11 (range, 33–83 years) and that for female participants (61 of 259, 24%) was 58 years ± 12 (range, 32–85 years). The characteristics of the participants with DENSE imaging findings are described in Table 1. The cardiac MRI findings for participants are described in Table 2, and clinical examples are illustrated in Figure 2.