We thank Drs. Sharma and Chatterjee for their comments in regards to our recently published paper (1). A previous report demonstrated that multidetector computed tomography could detect peri-infarct tissue heterogeneity 6 months after myocardial infarction (MI) that could trigger ventricular arrhythmias (2). However, we could not detect peri-infarct tissue heterogeneity and calcium deposits of infarcts immediately after primary percutaneous coronary intervention. Acute MI is associated with myocardial edema during the acute phase (3), and therefore, this also may influence the extent of myocardial contrast delayed enhancement. We agree that automatic implantable cardioverter-defibrillators (AICDs) are known to improve the prognosis in a subset of patients who have had an MI, but only a few patients received AICD therapy in our study. There is a low incidence of sudden cardiac death in survivors of MI in Japan. During an average follow-up of 4.1 years, 1.2% of 4,122 consecutive patients with acute MI discharged from the hospital had sudden cardiac death (4). AICDs are implanted only in high-risk patients with cardiac dysfunction (left ventricular ejection fraction <40%), nonsustained ventricular tachycardia, and sustained ventricular tachycardia induced during an electrophysiological study.