updated 07/12/2013 AT 6:00 AM ET
•originally published 07/12/2013 AT 7:00 AM ET
Travis remained in critical condition under sedation after surgery to relieve pressure on his brain Wednesday night, publicist Kirt Webster said. The 54-year-old Grammy Award-winning singer had been improving while being treated for heart failure caused by a viral infection when he had the stroke.
Nancy Jones, the widow of Travis’s lifelong hero George Jones, paid a visit to Travis on Thursday.
Stars including Hillary Scott of Lady Antebellum and Martina McBride and the Grand Ole Opry used Twitter to express their concerns and join Webster’s call for prayers for the singer, a popular and pivotal figure in country music. Hundreds posted messages with the hashtag PrayforRandy.
“We’re all pulling for you Randy,” Brad Paisley said via Twitter.
The setback occurred hours after doctors said Travis was showing signs of improvement since the start of treatment Sunday for congestive heart failure and the insertion of a pump to help his heart increase blood flow.
His doctors said Wednesday in a video statement that his heart problem stemmed from an upper respiratory infection caused by a virus, but they have not released any information since.
It was not clear what kind of stroke Travis suffered.
Drs. William Gray and Michael Mack of the Baylor Health Care System in Texas described Travis’ condition and hospitalization for the first time in a video statement earlier Wednesday, noting his condition had stabilized and he had “shown signs of improvement.”
Hours later, he was in the operating room. Doctors had not yet addressed Travis’s current condition publicly Thursday, and Webster said in an email he had no further information to release.