This case report is based on an accepted poster abstract1 from the January 2008 Boston AF Symposium co-authored by Seiichiro Matsuo, MD, Mélèze Hocini, MD, *Olivier Leonard, Sébastien Knecht, MD, Isabelle Nault, MD, Kang-Teng Lim, MBBS, Matthew Wright, MBBS, PhD, Nicolas Lellouche, MD, Nicolas Derval, MD, Frederic Sacher, MD, Pierre Jaïs, MD, Jacques Clementy, MD and Michel Haïssaguerre, MD, at the Hôpital cardiologique du Haut-L’Evêque, Université Victor Segalen Bordeaux II, Bordeaux, France, and *Bard Electrophysiology in Lowell, Massachusetts