title: Activation patterns and conduction velocity in posterolateral right atrium during typical atrial flutter using an electroanatomic mapping system.
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.
  
  
  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.
authors.affiliation: Division of Cardiology, Department of Medicine and Clinical Science, Yamaguchi University Graduate School of Medicine, Ube, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Sawa
authors.forename: Akihiko
authors.initials: A
authors.lastname: Shimizu
authors.forename: Takeshi
authors.initials: T
authors.lastname: Ueyama
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Yoshiga
authors.forename: Shinsuke
authors.initials: S
authors.lastname: Suzuki
authors.forename: Naoki
authors.initials: N
authors.lastname: Sugi
authors.forename: Makoto
authors.initials: M
authors.lastname: Oono
authors.forename: Toshihide
authors.initials: T
authors.lastname: Oomiya
authors.forename: Masunori
authors.initials: M
authors.lastname: Matsuzaki
mesh_terms: D000368:Aged; D001282:Atrial Flutter / Q000503:physiopathology*; D017115:Catheter Ablation / Q000295:instrumentation / Q000379:methods*; D022062:Electrophysiologic Techniques, Cardiac / Q000295:instrumentation / Q000379:methods*; D005260:Female; D006325:Heart Atria / Q000503:physiopathology*; D006329:Heart Conduction System / Q000503:physiopathology*; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009200:Myocardial Contraction / Q000502:physiology; D014682:Vena Cava, Inferior / Q000503:physiopathology; D014683:Vena Cava, Superior / Q000503:physiopathology