Looking for historical data (Yawn, I know)
I do not know of a study. My surgeon who also does alot of research and publish papers in medical journals said reflux varies so much on the individual. I had my VSG on 1/3/13 and had reflux before surgery taking 1 protonix a day and still taking it and have no problems and no throwing up or issues. My sister had her surgery on 12/5/12 with a hernia repair and she takes nothing for reflux. Her surgeon asked her if she had any issues with reflux due to the size of her hernia and she stated no.. I think this area of the surgery is just so hard to pin down in a scientific way.
I was a bit scared because I had read sometimes the surgery makes it worse, but for me just not the case. I am hoping to be off the one protonix because honestly I dont feel I need it anymore. Good luck with your surgery..