There were no significant differences in the rates of periprocedural stroke and death ( hazard ratio , @ ; @ % confidence interval , @-@ @ ; P = @ ) , in immediate reoperation ( hazard ratio , @ ; @ % confidence interval , @-@ @ ; P = @ ) , or in the @-year risk of ipsilateral stroke ( hazard ratio , @ ; @ % confidence interval , @-@ @ ; P = @ ) .