XXXX severity and the occurrence of @entity1540 during acute @entity1563 during balloon angioplasty.

@entity1 @entity1563 @entity3979 @entity1540 @entity850 @entity943
To elucidate the incidence and determinants of early @entity943 ( @entity943 ) during acute @entity1563 , continuous electrocardiographic, heart rate, and blood pressure recordings were performed in 152 @entity1 during standardized balloon occlusions of significant (50% to 95%) @entity3979 . A control group of 13 @entity1 with chronic total occlusion of a coronary artery was also studied. None of them developed @entity943 during balloon inflation in the preexisting total occlusion of the artery. Balloon occlusion of a coronary artery was associated with occurrence of @entity1540 in 18 @entity1 ( @entity943 group, 12%). The @entity943 group had milder @entity850 severity (72% vs 81%, p < 0.001) than the rest of the @entity1 , and none of them had visible collaterals to the occluded vessel. The @entity943 group also had ST-segment deviations more often (p < 0.05) during occlusion than @entity1 with no @entity943 . Occlusion of the left anterior descending artery caused @entity943 more often (p < 0.05) than occlusion of the left circumflex or right coronary artery. No clinical or hemodynamic variable or medication was associated with the occurrence of @entity943 . In stepwise logistic regression analysis, the only significant predictors of @entity1540 were the @entity850 severity and the anterior site of @entity1563 . Even a nonstenotic plaque can be so fragile that it is prone to rupture. The present findings suggest that such an occlusion may result in electrical instability more easily than occlusion of a more advanced coronary lesion.
