The 73-year-old Sajak had to undergo emergency surgery this week for a blocked intestine, resulting in the cancelation of Thursday's taping. “The Wheel of Fortune taping on Thursday was canceled because host Pat Sajak underwent successful emergency surgery to correct a blocked intestine,” the show posted on Twitter. “He is resting comfortably and looking forward to getting back to work. Taping resumed today as scheduled, and Vanna White has stepped in a host.” One week ago, Sajak appeared to be in good health when he joined White and Jeopardy! host Alex Trebek in celebrating their longtime producer Harry Friedman's Hollywood Walk of Fame star.