Randy Travis 'stabilized' and improving, doctor says July 10, 2013 -- Updated 2030 GMT (0430 HKT) Randy Travis poses backstage at the 46th Annual Grammy Awards in Los Angeles. Randy Travis is being treated at The Heart Hospital at Baylor Plano in Texas Doctors implanted a device in his heart to help blood flow His illness is related to his "recently acquired viral cardiomyopathy," his publicist says (CNN) -- Randy Travis has "stabilized and he has shown signs of improvement" since Monday, one of his doctors said Wednesday. The country singer was initially hospitalized Sunday at Baylor Medical Center at McKinney, Texas, "with a presumptive cardiomyopathy and congestive heart failure," Dr. William Gray said. Travis, 54, was transferred to The Heart Hospital at Baylor Plano in Texas on Monday, Dr. Michael Mack said. "We determined together in a joint decision that a higher level of specialized care was appropriate, and therefore we transferred him to The Heart Hospital," Mack said. Travis was listed in critical condition but has improved since his transfer, Mack said. Doctors implanted a device in his heart to help blood flow. The singer "underwent the placement of an Impella peripheral left ventricular assist device for stabilization prior to transferring hospitals," Travis spokesman Kirt Webster said in a written statement Tuesday. The Mayo Clinic's website described the device as "an implantable mechanical pump that helps pump blood from the lower chambers of your heart to the rest of your body." Travis' illness is related to his "recently acquired viral cardiomyopathy," Webster said.