At the mitral annulus-aorta (MA-Ao) junction, the left atrium is continuous through the subaortic curtain with the musculature of the anterior mitral leaflet. Under experimental conditions, this region can generate abnormal electrical activity. In patients with left atrial tachycardia, we investigated whether this region could be the source of this arrhythmia.
Division of Cardiovascular Medicine, University of Florida College of Medicine, PO Box 100277, Gainesville, FL 32610-0277, USA. gonzamd@medicine.ufl.edu