11.   And the true test of the success of a bypass operation is how many years the grafts stay open.

12.   And while Yeltsin remains in seclusion recovering from a heart bypass operation, the battle between Chubais and Korzhakov is unlikely to ease anytime soon.

13.   Are coronary bypass operations the best approach for people of different ages and in different states of health?

14.   As he prepares for his heart bypass operation, President Boris Yeltsin is not taking phone calls, meeting with aides or even glancing at briefing papers.

15.   At the New York University Medical Center, surgeons are already using it to perform valve replacements and multiple-vessel bypass operations.

16.   Bad cases can lead to serious heart attacks, or can be treated with drugs, bypass operations or angioplasty to open up clogged arteries.

17.   Because a clamp is placed across the aorta as part of the operation, bits of plaque can break off during bypass operations to cause strokes and intellectual impairment.

18.   After a bypass operation, a third to half of patients suffer from cognitive problems ranging from short-term confusion and memory loss to major strokes.

19.   Akchurin has said that Yeltsin will undergo another angiogram and other heart tests before the bypass operation.

20.   Akchurin performed a bypass operation on Prime Minister Viktor Chernomyrdin about four years ago at the center, DeBakey said.