As Brooks noted here at WrestlingNewsWorld.com, Ric Flair was backstage at WWE Raw in Philadelphia. He was bothered by an issue with a blood clot in his leg and was examined by WWE medical personnel. The decision was made by senior ringside physician Chris Amann to send Flair to the hospital for further evaluation.
Flair was later released from the hospital and is on his way back to his home in Charlotte, North Carolina. Flair had to pull out of a booking with All Japan Pro Wrestling back in January due to an issue with a blood clot.
I haven't heard what the specific plan was but apparently Flair was scheduled to appear on this week's Raw. When he couldn't go, the show was rewritten.