Cheney said on Friday doctors told him there was "no reason" he could not continue to function normally as vice president.
"I have no long-term doubts. The doctors have assured me that there is no reason why either the procedure or the device that is being implanted should in any way inhibit my capacity to function as vice president," he said before the operation.
"It's like having an emergency room implanted in your chest," said Dr. Douglas Zipes, a cardiologist at Indiana University School of Medicine in Indianapolis. Experts said the device should prevent any problems.
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