90 Minutes to Give Baby Luna a New Heart NYT: Science By:Simar Bajaj 1 January 2026 at 10:39 After eight years of training, Dr. Maureen McKiernan made her debut as the lead surgeon on an infant heart transplant β an operation on the edge of whatβs possible. Β© Victor J. Blue for The New York TimesBefore Lunaβs heart transplant, Dr. Goldstone advised Dr. McKiernan to βplan the surgery out β every detail down to the suture,β she recalled.