Location of earliest activation/arrhythmia type AT count Mean CL (SD), ms
Bachmann’s bundle 9 352 (58)
Proximal portion of the LA appendage 7 351 (49)
Free wall of the RA 5 391 (88)
Ligament of Marshall 4 275 (56)
Posterior wall of the LA 4 361 (41)
Coronary sinus ostium 3 435 (95)
Peri-mitral flutter 3 233 (8)
Biatrial flutter 1 375
Posterior wall of the RA 1 512
High septal region of the RA 1 515