Pastor Jeff,
sorry to hear that you have developed some cardiac issues since donation. Cardiac ablation is a common procedure to stop A fib if not adequately controlled with medication. I used to work in cardiology as a vascular sonographer so I am familiar with this patient population. It does sound a little scary so i can understand your concern. Your electrophysiologist (the specialty in cardiology that deals with the electrical nature of the heart) can be a great resource.
Questions you can ask your nephrologist is about the effects of the medication you have been on for the A fib and how it effects kidneys. is it kidney friendly? The ablation per say, should not effect your kidney. Sedation will most likely be used so you can ask your nephrologist about the different medications and nephrotoxicity. You will have blood work before to check you kidney function.
if the ablation is successful you might be able to be off the A fib medication. do you take anticoagulation like aspirin, warfarin. eloquis or any of the other anticoagulation meds on the market? how has your nephrologist advised you with that? again, all risk versus benefit.
let us know how it goes. and wish you best of luck with your procedure.
Sherri