Arteriography showed 100% blocked circumflex..had bypass on lad 16 yrs ago..i'm 83.....prognosis?...worried

Need more info....: Not all 100% blocked lesions need to be fixed. Depends on symptoms, if any, and more importantly can they be attributed to that lesion. That is, your body might have already formed "auto-bypasses" to the chronic blockage. You and your cardiologist need to have a frank discussion about your options: do nothing, medical management or interventional based treatment; risks/benefits and trade-offs.