I'm in the earky process of learning about & considering chelation for my 4 y/o daughter with PDD-NOS. One major concern is that she had a device made of nickel, titanium, and polyester (amplatzer.com)placed 1 1/2 years ago to close a hole in her heart. I'm concerned about the impact chelation has on such a device. Does anyone have any resources where I can gather scientific information on the matter?