by Texas Heart Institute Design of injectable hydrogel electrode. Redox initiation reaction of polyether urethane diacrylamide (PEUDAm) macromer + N-acryloyl glycinamide (NAGA) delivered using double barrel syringe with a mixing head. Ammonium persulfate (APS) and iron gluconate (IG) are used as initiator and reducing agents. Resulting hydrogels display bidentate hydrogen bonding at netpoints for improved...