I had the Nissen surgery 3 years ago for atypical symptoms. My lungs reacted very badly to my reflux, even though it was minimal (my DeMeester score was just a little over the high range for "normal"). It took me 5 years of very sick lungs before my GI doc finally believed my PCP, who was certain that my reflux was making my asthma much worse. My lungs were in a "life-threatening" condition, and my PCP pushed long and hard to get me in to a surgeon, while my GI doc dragged his feet because he didn't think I needed surery.
Anyway, long story short, after 2 and a half months of healing, my lungs recovered and were healthy again for the first time in years. Because my lungs are highly sensitive to any reflux, my PCP and asthma docs want me to take 40mg Protonix before dinner and continue to sleep with the head of my bed elevated. These are just proactive measures...it is very possible to get a little reflux after surgery. The surgeon only goes for "normal reflux" (less than 14.7 DeMeester score) because to achieve zero reflux we wouldn't be able to swallow.
(Prior to surgery I was taking 40mg Protonix AM and PM as well as 300mg Ranitidine at bedtime, and still my lungs were horrible.)
Since my surgery my inhaled steroid dose is a fraction of what it was. I don't have to use my nebulizer daily (actually I haven't used it since my surgical recovery--before surgery I used it several times daily) Also, I haven't had to take oral steroids since my surgery.
GI docs aren't quick to send LPR patients for surgery. One reason is that those of us with LPR may not have the high levels of reflux, but are extra-sensitive to the reflux that does make it into our esophagus. I think GI docs are fearful that if the surgeon can't get the reflux low enough, a LPR sufferer may not get relief.
My surgery was very successful. Some might wonder if the fact that I still take a PPI before dinner it means my surgery was a failure. This could not be further from the truth. My lungs became healthy after surgery. If I need to take a PPI to ensure that they continue to remain that way, I'm happy to do so. I threw lots of medications at my lungs before my surgery and my they were very sick.
The 75% effective for atypical symptoms is what I remember seeing as well. Hey, those odds aren't all that bad. If you can get feeling better, even if you're not perfect, will be a big improvement.
Good luck with your appointment with the surgeon!