BUN and creatinine are functions of the fluid volume (dehydration) and kidney function. Ace-inhibitors can impact the kidney function as they influlence the renal angiotensin system of the kidney and hence, lower the systemic blood pressure. A mild increase in the creatinine is not an unusual. This does not indicate renal failure but that the ace inhibitors are working. A moderate to high level of creatinine would suggest that you may need to come off the ace-inhibitors or at least examine the need to be on the medication.
I'm not sure if amioderone can cause renal disease. I dont believe that norvasc or coumadin can cause this but I would venture to say that any medicine can cause anything.
I would think that the effects of surgery in December on the kidneys would not be seen at this late date, assuming that this development was noted recently. In other words, the impact of the surgery at this late date would, I think, be unusual. However, if there was a gradual increase in the documented creatinine values from the time of the surgery to now, then it would be something to consider (hypotension or unusually low blood pressure during the surgery with subsequent decrease in blood perfusion of the kidneys) but an acute rise just now noted would make me wonder about other possibilities.
I would think that you would need to look at what your baseline creatinine was prior to surgery and compare to the subsequent creatinine values and trends and see what the pattern is to get a better handle on what is causing this. You are not on diuretics so dehydration is less likely but certianly plausible if you simply not drinking enough water.
Depending the lab, the normal or reference values of creatinine are generally around 0.5 to 1.5. I agree with Ross, that it would be helpful to find out what your creatinine is. Then let us in on when the meds you outline were instituted and see if that is when your creatinine began to rise.
An ultrasound can provide a good deal of information about the acuteness or chronic nature of kidney problems if neccessary.
Lastly, let us know how things are going. Its the pits to have worries after major surgery like this. But, lets just hope its dehydration, and nothing more than what a couple glasses of water can cure.
