I am 69 years old.  On August 30, I passed out, was taken to the hospital, and had two other episodes.  I have chronic kidney disease with creatine around 2.0 .  I had anemia and hemoglobin was 7.9, was given two units of blood.  Also, had infection in my parotid gland.  I was in ICU 4 days and discharged in stable condition.  My doctor sent me to a cardiologist, who wants me to have a cardiac catherization.  I had no increase in cardiac enzymes and an ECHO in the hospital showed very mild valve leakage.  Is this invasive, risky procedure necessary.
Hi, I think your doctor wants to be in the safe side by sending you for coronary angiography. Patients with chronic kidney disease are at higher risk for developing ischemic heart disease, you have two episodes of syncope, so your doctor may be afraid not to miss coronary artery blockage. But if you are concerned much about the procedure, you may discuss with your doctor the possibility of stress test instead of coronary angiography. If there are still doubts after the stress test, then you can go for the angiography. Take care