Updated: Tuesday, July 9 -- 4:15 p.m. ET

Randy Travis remained in critical condition Tuesday (July 9) in a Plano, Texas, hospital after undergoing a heart procedure on Monday, according to the Dallas Morning News.

The 54-year-old singer-songwriter was admitted to the hospital Sunday after being diagnosed with viral cardiomyopathy, a heart condition caused by a virus. The disease weakens and enlarges the heart muscle, making it harder for the heart to pump blood and carry it to the rest of the body.

However, despite previous reports, Travis' Nashville-based publicist denies that the singer has undergone heart surgery. According to a statement issued Tuesday afternoon, "Travis ... underwent placement of an Impella peripheral left ventricular assist device for stabilization prior to transferring hospitals."

According to the website for the manufacturer of the medical device, the pump can be inserted via a standard catheterization procedure through the femoral artery, into the ascending aorta, across the valve and into the left ventricle.

Teresa Traywick, the wife of Travis' brother Ricky Traywick, mentioned the surgery during an interview with People magazine.

"We have been told he has had surgery," she said. "Our prayers are going out to him because my husband just had a heart attack last year, so it is in their family. ... Their mother passed away at an early age with her heart, so it is like these boys are following right in their footsteps. My prayers are with them. That's all I can say right now."

Travis' illness follows turbulent times in 2012 when the singer was arrested for public intoxication outside church in Sanger, Texas, and an automobile accident near his ranch in Tioga, Texas, and an altercation with his fiancee's estranged husband on the parking lot of a church in Plano.

Pete Schulte, Travis' attorney in the Plano case, told People he was unaware of any health issues the singer faced prior to his hospitalization for the heart ailment.

"To my knowledge, he was doing very well prior to this illness," Schulte said.

After signing to Warner Bros Records in 1985, Travis scored 16 No. 1 singles, including "On the Other Hand," "Forever and Ever, Amen," "I Won't Need You Anymore," "I Told You So," "Diggin' Up Bones," "Deeper Than the Holler," "Is It Still Over" and "Three Wooden Crosses."

He won Grammys for best male country vocal performances in 1987 and 1988 and was inducted into the Grand Ole Opry in 1986.