Figure 11g

Diagram of the Sites of 60 Foci Triggering Atrial Fibrillation in 45 Patients. Note the clustering in the pulmonary veins, particularly in both superior pulmonary veins. Numbers indicate the distribution of foci in the pulmonary veins.

Reference:Haaissaguerre,M.,and others,Spontaneous Initiation of Atrial Fibrillation by Ectopic Beats Originating In The Pulmonary Veins,N.Engl.J.Med.1998:339;659-66