Activation Patterns and Conduction Velocity in Posterolateral Right Atrium During Typical Atrial Flutter Using an Electroanatomic Mapping System

Akira Sawa; Akihiko Shimizu; Takeshi Ueyama; Yasuhiro Yoshiga; Shinsuke Suzuki; Naoki Sugi; Makoto Oono; Toshihide Oomiya; Masunori Matsuzaki

doi:10.1253/circj.72.384

Clinical Investigation

Activation Patterns and Conduction Velocity in Posterolateral Right Atrium During Typical Atrial Flutter Using an Electroanatomic Mapping System

Akira Sawa, Akihiko Shimizu, Takeshi Ueyama, Yasuhiro Yoshiga, Shinsuke Suzuki, Naoki Sugi, Makoto Oono, Toshihide Oomiya, Masunori Matsuzaki

Author information

Akira Sawa
Division of Cardiology, Department of Medicine and Clinical Science, Yamaguchi University Graduate School of Medicine
Akihiko Shimizu
Faculty of Health Sciences, Yamaguchi University Graduate School of Medicine
Takeshi Ueyama
Division of Cardiology, Department of Medicine and Clinical Science, Yamaguchi University Graduate School of Medicine
Yasuhiro Yoshiga
Division of Cardiology, Department of Medicine and Clinical Science, Yamaguchi University Graduate School of Medicine
Shinsuke Suzuki
Division of Cardiology, Department of Medicine and Clinical Science, Yamaguchi University Graduate School of Medicine
Naoki Sugi
Division of Cardiology, Department of Medicine and Clinical Science, Yamaguchi University Graduate School of Medicine
Makoto Oono
Division of Cardiology, Department of Medicine and Clinical Science, Yamaguchi University Graduate School of Medicine
Toshihide Oomiya
Division of Cardiology, Department of Medicine and Clinical Science, Yamaguchi University Graduate School of Medicine
Masunori Matsuzaki
Division of Cardiology, Department of Medicine and Clinical Science, Yamaguchi University Graduate School of Medicine

Keywords: Atrial flutter, Catheter ablation, Conduction velocity, Crista terminalis, Electroanatomic mapping system

JOURNAL FREE ACCESS

2008 Volume 72 Issue 3 Pages 384-391

DOI https://doi.org/10.1253/circj.72.384

Details

Abstract

Background To investigate the activation patterns and conduction velocity (CV) in the posterolateral right atrial (RA) wall during typical counterclockwise atrial flutter (AFL) using an electroanatomic mapping system. Methods and Results During typical AFL in 25 patients, the transverse conduction pattern and CV were classified and calculated. The line blocking transverse conduction was defined by the conduction pattern and double potentials recorded during mapping. There were 3 types (including 2 subtypes) of transverse conduction pattern based on the conduction blocks across the posterolateral RA in a line between the superior and inferior venae cava. Trans-cristal conduction activation in a horizontal direction was seen in all but 4 patients. The CV in the gap area was 0.59±0.21 m/s. Conclusions Three types of transverse conduction pattern were observed during trans-ctristal conduction and the trans-ctristal CV was relatively slower than that in other parts of the RA, except for the isthmus. (Circ J 2008; 72: 384 - 391)

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