Mitral isthmus

Mitral isthmus

Mitral isthmus is the region between the left inferior pulmonary vein ostium and the mitral annulus. Mitral isthmus ablation is useful in prevention of left atrial macroreentrant tachycardia which can occur following pulmonary vein isolation for the treatment of atrial fibrillation [1].

Reference

1. Feifan Ouyang, Sabine Ernst, Thomas Vogtmann, Masahiko Goya, Marius Volkmer, Anselm Schaumann, Dietmar Bänsch, Matthias Antz, Karl-Heinz Kuck. Characterization of reentrant circuits in left atrial macroreentrant tachycardia:critical isthmus block can prevent atrial tachycardia recurrence. Circulation. 2002 Apr 23;105(16):1934-42.