The endocardial magnet is advanced across the temporarily deflated cryoballoon into the left atrial appendage and the epicardial magnet via an epicardial sheath. The Lariat is introduced over the epicardial sheath and is advanced over the left atrial appendage to the base of the left atrial appendage. CB, cryoballoon; CS, coronary sinus; MN, magnets; TS, transseptal sheath.