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Background To investigate the influence of diabetes mellitus (DM) on the long-term curative effect of implanted sirolimus-eluting stent in the elderly patients with coronary heart disease (CHD).Methods The elderly patients (n=82) with CHD complicating DM were chosen as DM group from Jan.2005 to Oct.2007,and at the same time other elderly patients (n=69) with CHD without DM were chosen as non-DM group.