A new study finds ischemic strokes linked to PCI procedures are infrequent and often related to factors that may be modified. The study found parameters such as sheath size, number of catheters and urgent IAPB may affect outcomes. Experts said that because such strokes are so rare, it's unclear how practice should be affected by the results. "Some [stroke predictors] are going to be markers for worse disease no matter how much you adjust," Dr. Sunil V. Rao said. "There are going to be some patients [for] whom the priority is to treat their coronary disease, and that may require something like a large guide catheter or rotational atherectomy to achieve the goal."