CHICAGO -- Nearly a year after a stroke left him barely able to move the left side of his body, U.S. Sen. Mark Kirk is expected to climb the 45 steps to the Senate's front door this week -- a walk that's significant not just for Illinois' junior senator, but also for medical researchers and hundreds of thousands of stroke patients.

It's estimated only one-third of patients return to work after a stroke, said Dr. Elliot Roth, medical director of the Rehabilitation Institute of Chicago's New Patient Recovery Unit and AbilityLab, where Kirk recovered.

The 53-year-old Republican will return to the high-profile, demanding life of a Washington lawmaker after an experimental rehabilitation so intense it's often compared to boot camp, Roth said. Patients keep grueling schedules, often spending eight hours a day or more relearning how to walk, talk and do other tasks.

Because there are risks to going back to work unprepared, patients do "practice runs" of what it will be like to be back on the job. If and when they successfully return to work, Roth added, "It's like having a great symphony play and recognizing it's all the practice beforehand that went into it."

Kirk, who won President Barack Obama's former Senate seat in 2010, checked himself into a hospital in January 2012 after feeling dizzy. Tests revealed that the avid swimmer had suffered a major stroke. Surgeons had to remove two small pieces of destroyed brain tissue, and temporarily removed a 4-inch by 8-inch portion of his skull to allow for swelling.


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Doctors said movement in Kirk's left side was severely limited. He was in intensive care and would need speech therapy, but they expected he would make a full mental recovery.

Within days, they said Kirk was asking for his Blackberry. In May, Kirk released a video updating his progress and showing footage of him walking with the help of a harness, a cane and Rehabilitation Institute of Chicago staff. It also included clips of Kirk speaking while sitting in a chair, his left shoulder lower than his right and the left side of his face still largely paralyzed.

Kirk said in the video that his staff had counted the steps from the parking lot to the front door of the Senate. It was his hope to climb all 45 of them someday, "to fight for the people of Illinois."

In a separate video released three months later, Kirk was shown climbing stairs at the RIC and working in his home office. He said he had moved back to his home in the north Chicago suburbs, and that he was talking to his staff several times a day and keeping up with business in Washington via email. He also touted the experimental therapy, through which he had logged almost 15 miles and 145 flights of stairs.

In November, Kirk climbed 37 floors of stairs inside Chicago's Willis Tower as part of an RIC fundraiser. One of his therapists called it "remarkable progress."