Omartinez - Sorry to hear about your wife's health situation. I have a daughter who has swallowing issues related to Rett Syndrome. Fortunately, she doesn't have a g-tube, but many of these kids do. Before having my daughter, I had no idea that swallowing requires so much muscle coordination and control. We completely take it for granted that these things just work without thinking about it.
You absolutely need to talk with a GI specialist. Also, people who work with nutrition in disabled people/ the elderly should be very familiar. If Brick sees this he'd be qualified to give you some basic information, but it would be better to talk to her physician. Depending on the health issue, find a support group. I've learned so much from other parents. The physicians just don't always know the everyday tricks of the trade like people who have lived with these things.
Best of luck to you and your wife.