CHICAGO -- Some signs of brain damage have been seen in Indiana Gov. Frank O'Bannon after he underwent emergency surgery for a cerebral hemorrhage, but the extent of damage wasn't immediately known, a Chicago surgeon said Tuesday.

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Dr. Wesley Yapor, who was involved in O'Bannon's surgery Monday at Chicago's Northwestern Memorial Hospital, said reflex movements indicate some damage to the governor's brain. O'Bannon was in critical condition, on life-support equipment, and in a drug-induced coma Tuesday.

Bleeding on O'Bannon's brain -- which doctors said probably involved a stroke -- was discovered after the governor was found unconscious in a Chicago hotel room Monday morning.

"As with nearly every significant stroke, it is certain there has been damage to the brain, but it is still too early to tell the degree of disability or prognosis at the present time," Yapor said in a press release. "It is still possible the governor may recover substantial neurological function -- we just do not presently know."

Yapor said two computerized tomography scans showed the surgery successfully removed blood from O'Bannon's brain, and that the surgery saved his life.

He said the pressure inside O'Bannon's head was more controlled than it was prior to surgery. O'Bannon's vital signs also were more stable Tuesday morning, Yapor said.

Northwestern Memorial Hospital spokeswoman Kelly Sullivan said O'Bannon's pupils were small -- a positive sign. She said O'Bannon is expected to remain in a drug-induced coma for at least several days.

Yapor on Monday said bleeding on O'Bannon's right side of his brain might be indicative of a stroke. In addition, some type of trauma caused more bleeding on both sides of the brain, indicating he may have fallen, Yapor said.

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Yapor said the next 24 to 48 hours would be critical for the governor.

O'Bannon was found unconscious around 9 a.m. in his room at the Palmer House Hilton in downtown Chicago, where he was planning to speak at a meeting of the Midwest U.S.-Japan Association, officials said.

The governor was admitted to the hospital around 9:30 a.m. He was unconscious and unresponsive from the time he was found, though he was breathing on his own at the hotel, a Northwestern Memorial Hospital doctor said.

O'Bannon was found in the hotel room after his staff members weren't able to reach him by phone, officials said.

Lt. Gov. Joe Kernan, who also was in Chicago for the conference, flew back to Indianapolis after O'Bannon was taken to the hospital and told reporters he was assuming acting-governor duties.

President George W. Bush attempted to contact Judy O'Bannon Monday night but was unsuccesful, RTV6's Rafael Sanchez reported.