Abstract
Recent electrophysiological studies suggested that the left and right atrial posterior wall originated ectopic beats and functioned as anatomical substrates. For example, the right atrial posterior wall harbors the terminal crest, sinoatrial node, and coronary sinus opening. In the left atrium, four pulmonary vein openings should be designated. Distribution of these anatomical structures must to be known as a landmark for catheter ablation procedure. In addition, atrial fibrillation (AF) increase in its incidence after middle-age, age-related changes in atrial wall should be counted. Differently from AF, atrial tachycardia (AT) that arose from atrioventricular (AV) junctional tissue seems to be even more uncomplicated, because most of the substrates are regarded as the remnant of embryonal AV nodal tissue. Interestingly, a recent study reported the maldistribution of AT foci between the left and right AV annulus. In the tricuspid annulus, AT foci show diffuse distribution, but in the mitral annulus prevail mainly on right and left fibrous trigone. This phenomenon seems to be resonant with recent report of superior AV nodal reentrant tachycardia mainly subjected on the right fibrous trigone. This chapter maintains these phenomena concomitantly with distribution of nodal tissue on AV annuli. In addition, we mention concerning about the connection of right and left atria, mainly composed with Bachmann’s bundle and coronary sinus musculature. These myocardial arrangements may explain various electrophysiological phenomena inevitably brought from one atrium to another. We wish this chapter may contribute to the improvement of catheter technique and reduction of complications.
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Inoue, S., Ogawa, G., Matsuyama, TA. (2018). Atrial and Atrioventricular Junctional Anatomy: Myocardial Orientation and Its Heterogeneity. In: Hirao, K. (eds) Catheter Ablation. Springer, Singapore. https://doi.org/10.1007/978-981-10-4463-2_1
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