RecruitingDevice studySafety and Efficacy of the Sentinel Cerebral Protection Device in Atrial Fibrillation AblationThe purpose of the study is to see if the Sentinel® Cerebral Protection System may prevent occurrence of stroke during an ablation procedure for atrial fibrillation (AF). The secondary purpose of this study is to study if cognitive function after AF ablation differs between those treated with the Sentinel cerebral protection device and those who do not receive the device.