My mother has diabetes , and had to get a triple heart bypass done 6 years ago, and has developed copd , Now she is having problems again with her heart, and the doctors want to put in stents, but she has severe kidney damage. They have been using blood thinners to treat it but it just gets worst and they won t do the surgery until it is more stable. Is there nothing that can be done about the heart blockages where the kidneys would not be an issue?