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.