1.   Analysts noted Wednesday that ReoPro is used in half of all stent procedures.

2.   That problem is what doctors call restenosis, a common complication of the stent procedure that Cheney underwent in late November when he suffered his fourth heart attack.

3.   The stent procedure is safer than balloon angioplasty in terms of immediate risk of heart attack, Goldberg said.

4.   And decided then to go with a stent procedure to open up that artery.

5.   Reiner said that following such stent procedures, there always was a chance of the artery becoming blocked again.