Mapping of non-PV triggers. (A) Catheter position during high-dose isoproterenol infusion; (B) PAC from the SVC triggering AF; (C) PAC from the IAS; (D) PAC from the CS triggering AF; and (E) PAC from the LAA. Green, SVC/CR; magenta, IAS; blue, CS; yellow; LAA. AF, atrial fibrillation; CR, crista terminalis; CS, coronary sinus; IAS, interatrial septum; LAA, left atrial appendage; PAC, premature atrial contraction; PV, pulmonary vein; SVC, superior vena cava.