Hi. If your cardiologist has decided for surgery, your mom will be thoroughly investigated for complete blood counts, renal profile, dibetic profile, coagulation profile, liver profile, echocardigraphy and so many othrt things and will be given medical fitness before operation. You are right that she should not be given pain killers and rest assured that she will be put on antibiotics which are safe in kidney disease. There are alternatives available for everything, and it is always a team work. Proper monitoring of urine, diabetic status,etc. will be ensured by a team of doctors during and after surgery. Other alternative is angioplasty, but with triple vessel disease, and with other high risk factors in your mom, like diabetes and kidney disease risk is much more. Your attachment of reports is not shown here, but i suppose your treating dr. must be the best judge. Thanks.