Left atrial isthmus: anatomic aspects relevant for linear catheter ablation procedures in humans

Journal of Cardiovascular Electrophysiology
Anton E Becker

Abstract

The success rate of catheter maze ablation procedures for atrial fibrillation depends upon adequate electrical isolation by performing linear ablation lesions. However, recurrence of atrial arrhythmias is not uncommon, particularly in the so-called left atrial isthmus, between the orifice of the left inferior pulmonary vein and the mitral valve annulus. The focus of the present study is the anatomy of this area. Twenty human hearts were studied. The distance between the left inferior pulmonary vein and the mitral valve, the thickness of the left atrial myocardium, and the extent of left atrial myocardium toward the mitral valve were measured. The AV groove contained a fat pad harboring the great cardiac vein. The distance between the vein and the valve varied considerably (range 17-51 mm). The great cardiac vein coursed along the inferior left atrial wall, approximately 1 cm above the level of the mitral valve. Myocardial thickness also varied considerably (distal: range 1.4-7.7 mm, midway: range 1.2-4.4 mm, proximal: range 0-3.2 mm). Left atrial myocardium extended onto the mitral valve in two hearts, and the left atrial myocardium ended above the level of the mitral valve (range 1.8-5.1 mm) in six hearts. An important variabl...Continue Reading

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