21.   Akchurin performed his bypass operation eight years ago.

22.   But in total, Russian surgeons perform far fewer bypass operations, particularly the complex ones, than do surgeons in many other countries.

23.   But the team said it did not know whether the improvement was from the cells or from the bypass operation.

24.   But they said a coronary bypass operation is statistically the most likely possibility.

25.   Chiel survived that heart attack, an eventual bypass operation, and now he recites that psalm daily.

26.   Cheney underwent the quadruple coronary bypass operation after his third heart attack.

27.   Critics question whether the bypass operations done off the pump are as thorough and effective as those done while the heart is motionless.

28.   DeBakey said there was general agreement among the doctors here in recommending postponement of the bypass operation.

29.   Doctors have decided to do a heart bypass operation on Boris Yeltsin.

30.   During a traditional bypass operation, the aorta is clamped off and the heart cooled down through medication.