As per the earlier response, I was suggested for a bipass and den EECP. But Why so? My dad is able to climb 2 floors easily and walks faster then me. He can walk for 1 km easily. He got 90% blockages in his RA and 90% blockage in LAD WITH A 70% blocakge in lateral end and a new development of 50% -60% blockage is happening at the proximal end of LAD. So my question mainly was to know why not go for EECP first as compared to bipass?