1. Intraoperative map-guided operation for chronic atrial fibrillation
Atsushi Harada, MD, Tadahiko Sugimoto, MD, Tetsuo Asano, MD, Kenichi Yamada, MD 
The Annals of Thoracic Surgery 
Volume 66, Issue 4, Pages (October 1998)
DOI: /S (98)

2. Fig 1
Twelve consecutive activation maps in the posterior aspect of the left atrium for a 100-millisecond window. The same pattern of activation sequences emerged from the left atrial appendage (LAA), indicated by a closed circle, and propagated to the body of the left atrium. The repetition of the same activation sequences was demonstrated in maps A, C, D, E, F, H, I, J, and K. Isochronous lines are drawn at intervals of 5 milliseconds, and the black arrows indicate the direction of spread of the activation. (PV = pulmonary vein.)
The Annals of Thoracic Surgery  , DOI: ( /S (98) )