is it very necessary to take asprine ,plagrine & astorvastine after CAGB, age 62years , 172cms, wt 80 kgs, undergone cabg in 2005 , My stress thallium report is negative but TMT is always Showing +ve .I am taking medicines for HYper tension Amlong -A, Olemasartan Medoxomil 20mg And Plagrine 75mg+Asprine 75mg & Astorvas20 + asprine 75 mg ,pl tell me is it very necessary to take asprine and other medicines for heart health