Title: Delineation of an intra-isthmus reentry circuit around the coronary sinus ostium using an ultrahigh-resolution mapping system
Abstract: • Intra-isthmus reentry is a variant of cavotricuspid isthmus-dependent atrial flutter. • Intra-isthmus reentry circuit can involve the rotational activation around the coronary sinus ostium. • Ultrahigh-resolution mapping can help delineate the complete intra-isthmus reentry circuit.