Nazih Zuhdi performed the first total intentional hemodilution open heart surgery on Terry Gene Nix, age 7, on 25 February 1960 at Mercy Hospital in Oklahoma City. The operation was a success; however, Nix died three years later.[13] In March 1961, Zuhdi, Carey, and Greer performed open heart surgery on a child, age 3 1⁄2, using the total intentional hemodilution machine.