The surgeon would be the source for the operational decision...you will probably be told to talk to your cardiologist.
For some insight, there are AAH/AAC guidelines for CAD treatment. If medication cannot successfully treat symptoms, then a stent implant. If a stent implant is not appropriate such as occlusion too long, location prohibits, etc. then CABG. If an occlusion is less than 70% do not stent, etc....usually that degree of occlusion presents no problems. As the good
Doctor from the Cleveland Clinc stated treatment (medication, stents, CABG) only treats the symoptoms not the disease. If you are asymptomatic, treatment you received would be considered a success. "Too weak for the procedure" doesn't make sense!