Hello Swati ,after you have ruled out heart blockages by doing an angiography ( which is the most common reason in diabetic patients ) , the next is what is called micro vascular disease may cause dilated cardiomyopathy. Due to diabetes there are certain degenerative changes in the heart muscle vasculature which will cause slow deterioration of heart function causing dilated cardiomyopathy. Medicine optimisation would cause reversibility and control of symptoms. If the Ekg finding are favourable and you have symptoms Inspite of medical therapy a form of pacemaker ( cardiac resynchronsation therapy ) may help improve the heart function . A more detailed evaluation is needed for the same . Regards Dr Priyank Mody