[Collateral circulation during exercise-induced XXXX : evaluation by coronary angiography].

@entity1 @entity63 @entity1242 @entity951 @entity2142
The pathophysiological significance of coronary collateral vessels remains controversial, despite previous intensive studies. We performed the multistage supine ergometer stress test for 26 @entity1 with effort @entity951 and collaterals. The changes in the collaterals were observed during each @entity2142 by coronary angiography before and after intravenous @entity1242 . The collaterals of 21 @entity1 disappeared or diminished during exercise-induced @entity951 before @entity1242 administration, and were unchanged in the remaining five cases. However, the collaterals of all @entity1 after @entity1242 administration were unchanged or increased during exercise-induced @entity951 . Considering there were no significant changes in pulmonary arterial end-diastolic pressures during @entity951 before and after @entity1242 administration, a pressure gradient between the donor and recipient coronary arteries was suggested as being related to the patency of the collaterals. These results suggested the following: 1. It is not appropriate to postulate that the collaterals visualized at rest may remain unchanged during exercise-induced @entity951 . 2. It is not reasonable to conclude that exercise accelerates the development of collateral circulation. 3. One favorable effect of @entity1242 administration is the prevention of exercise-induced @entity63 via collateral circulation.
