hi - i too have implants. I just turned 34 and have had them for 15 years. Holy cow, has it been that long? Wow. Anyway, I wouldn't get silicone or any sort of gel. Should one rupture, it can cause issues. I did have one rupture after the stupid docs poked a wire through one of my implants during heart surgery and was glad it was saline. It just flattened in a minute but didn't cause any issues because the saline is sterile and absorbed by the body without issue.
My cardiothoracic surgeon and cosmetic surgeon both did not see any problems for me to undergo breast augmentation surgery. I had it about a month after my heart surgery. I don't know about your specific conditions but I'd check with a cardiologist and a cosmetic surgeon (board certified) and see what they think. Your cosmetic surgeon might need a written 'okay' from your cardiologist before going ahead with the surgery.
Good luck!