"Legally, I agree [with Cheney aide Mary Matalin] that it was not an emergency procedure. On the other hand, the procedure was urgent," he said.
Braunwald said that despite Monday's operation, the risk of problems in other areas of Cheney's circulatory system still persists.
"[Cheney] is at a modest risk of developing a de novo problem in his coronary tree in a region that wasn't stented," Braunwald said.
Because of the prospect of future heart problems, some have questioned whether Cheney should serve as vice president.
The concerns are particularly relevant for Cheney, said Bradlee Professor of Government Thomas E. Patterson, because of Cheney's elevated role in President George W. Bush's administration.
"There are some unusual circumstances with this particular presidency and vice presidency," Patterson said. "Bush is one of the presidents with the least experience. Cheney, on other hand, is one of the most experienced vice presidents."
Though Cheney has taken on more responsibility, Braunwald said stress alone was not behind Monday's incident.
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