First, this was a retrospective study from a single hospital; thus, our findings may lack generalizability. Second, we did not prepare participants to obviate myocardial glucose uptake, and we excluded participants who had fasted for less than 12 hours. This potentially led to physiologic uptake and affected the result, although it was statistically significant under the same preparation conditions. Third, myocardial 18F-FDG uptake in scans that are not specifically performed to assess cardiac inflammation and that are influenced by many factors (age, sex, insulin resistance, diet, etc) are subject to inaccuracies.