Men's basketball special assistant Trey Schwab suffered a massive pulmonary embolism Monday, according to a statment released by the university. He underwent open-heart surgery to remove the embolism, which was a blood clot to the lungs.

Schwab was listed in critical condition with guarded prognosis after surgery. As of late Monday afternoon there was no change in his condition, said Karen Ingwell of University of Wisconsin Hospital.

Schwab, who was suffering from idiopathic pulmonary fibrosis, a rare and incurable disease, received a double lung transplant on Feb. 17, after a two-year wait on the donor list. There is an 84 percent survival rate one year following the surgery.

"Trey is a very special person who is going through an incredibly difficult time and it is our hope that everyone keeps him steadfast in their prayers," head coach Tom Crean said in the statement released by the universtiy.