Can multiple surgeries under general anesthesia for radiofrequency on c2, c3, c4, c5, c6, bilateral affect my kidneyfunction? recent blood high bun/crtn.

No.: Bun/cr are affected by a variety of factors - volume status, medications, etc but effects are not generally long lasting or even cumulative. If surgery/ anesthesia affected your kidney, your numbers would generally bounce back right away.

Use Different Agents: Perhaps you could the use of different general anesthetic agents, other than potent inhaled anesthetic agents, with your anesthesia provider. For instance, Propofol given i. V. With nitrous oxide could be given as a general anesthetic. There are many combinations that could be kind to your kidney's.

Unlikely: There is very, very low chance that you can have long lasting effect from general anesthesia affecting your kidney. Only if you had prolonged period of hypotension without urine output there could be reason for concern, but in most patients kidneys would recover quickly.

Possibly: The use of multiple anesthetics does not usually affect the bun/cr of a patient. There are some anesthetic agents that do have an affect on kidney function, but not significantly. Another possibility for your elevation is due to dehydration. Check with your physician to keep an eye on these values and continue to follow up.