Hi there my father Has multiple blockages as follows RCA Proximal 80% , Midsegment lesion 80% andDistal Lesion 60%. LAD :Proximial to midlad 90% stenosis , D1 :Osteal to proximial lesion 80 - 90 % , PDA OSteal LEsion 80% , PLV :Midsegment LEsion 80% , LCX : very small vessel , Lv Angio : EF 60%. is immediate CABG required or can it be prolonged for a while with medication he looks absolutely stable and normal.