Randy Travis critical after stroke

Randy Travis suffered a stroke while undergoing surgery yesterday.

The country music star was airlifted to hospital on Sunday due to problems with his heart. His spokesman has confirmed he is suffering from "complications of recently acquired viral cardiomyopathy", which is when the heart muscle becomes weakened due to a viral infection.

According to his publicist, Kirt Webster, Randy was undergoing surgery to relieve pressure on his brain and remains in a critical condition at a Texas hospital.

It is not known what kind of a stroke he suffered.

"His family and friends here with him at the hospital request your prayers and support," Kirt said in a press release.

Earlier on Wednesday, it was reported the 54-year-old's health was improving, but that Randy was still in a critical condition.

Physicians William Gray and Michael Mack of the Baylor Health Care System opened up about the star's condition via a video statement.

"His condition has stabilised, and he has shown signs of improvement," Michael said.

"On behalf of Mr Travis' family, friends and associates, we would like to express our extreme gratitude for the overwhelming affection and support that Mr Travis has received."

Up to three weeks before his hospitalisation, the singer seemed in good health.

He started experiencing problems when he contracted a viral upper respiratory infection, which eventually led a weakened heart muscle and then heart failure.

After his admission to the Baylor Medical Center McKinney on Sunday, Randy underwent a procedure to have a pump inserted by catheter to aid blood flow.

He was then transferred to The Heart Hospital Baylor Plano.

Famous friends have taken to Twitter to send Randy their best wishes and TMZ reported earlier this week that his family are "frantic" with worry.

Randy has recorded 20 albums since 1985, with his best-known songs including Diggin' Up Bones and Forever and Ever.