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Background The study aimed to compare the Arrhythmias and coronary angiography characteristics differences in elderly patients (aged 75 years or older) and younger patients (aged below 75 years).Methods The study included 644consecutive patients with acute myocardial infarction (AMI) treated in the Cardiology Ward of The First Affiliated Hospital of China Medical University in 2005-2010.Analyses were performed retrospectively.The patients were separated into 2 groups according to age.The group Ⅰ study group consisted of 244 patients aged 75 or over (mean 79 years) and the group Ⅱ consisted of 300 patients aged below 75 years (mean 62 years).