Patients with cardiac injury vs those without cardiac injury had shorter durations from symptom onset to follow-up (mean, 15.6 [range, 1-37] days vs 16.9 [range, 3-37] days; P = .001) and admission to follow-up (6.3 [range, 1-16] days vs 7.8 [range, 1-23] days; P = .039).