title: Quantitative analysis and characteristics of the electrograms recorded within the non-coronary aortic sinus of Valsalva.
abstract: BACKGROUND
  Some supraventricular tachycardias could be ablated from the non-coronary sinus of Valsalva (NSV). However, the characteristics of the NSV electrograms have not been clarified.
  
  
  RESULTS
  A quantitative analysis of the NSV electrograms was performed in 5 patients with tachycardias arising from near the atrioventricular node (AVN) and the His-bundle region, and in 20 control subjects. In another 7 control subjects, the NSV electrograms were compared with those recorded at the left and right sinus of Valsalva (LSV and RSV). The NSV electrograms during sinus rhythm had a larger atrial amplitude than ventricular amplitude, and the ratio of the atrial amplitude to the ventricular amplitude was usually >1, which was apparently different from the LSV and RSV electrograms. A tiny but distinct His-bundle deflection was sometimes recorded at the NSV during sinus rhythm while it was not during the tachycardia. The distance to the His-bundle region in the anteroseptal right atrium was shorter from the NSV than from the RSV or LSV.
  
  
  CONCLUSIONS
  The precise identification of the catheter position at the NSV is possible using the characteristics of the electrograms. Much attention should be paid during ablation to the NSV because of its vicinity to the AVN and His-bundle region.
authors.affiliation: Department of Cardiovascular Medicine, Okayama University Graduated School of Medicine, Density and Pharmaceutical Science, Japan.
authors.forename: Shigeki
authors.initials: S
authors.lastname: Hiramatsu
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Tada
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Sakamoto
authors.forename: Kenichi
authors.initials: K
authors.lastname: Kaseno
authors.forename: Chizuru
authors.initials: C
authors.lastname: Sato
authors.forename: Tadanobu
authors.initials: T
authors.lastname: Irie
authors.forename: Miki
authors.initials: M
authors.lastname: Yokokawa
authors.forename: Satoshi
authors.initials: S
authors.lastname: Nagase
authors.forename: Shigeto
authors.initials: S
authors.lastname: Naito
authors.forename: Kengo Fukushima
authors.initials: KF
authors.lastname: Kusano
authors.forename: Masakazu
authors.initials: M
authors.lastname: Yamagishi
authors.forename: Tohru
authors.initials: T
authors.lastname: Ohe
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Aonuma
authors.forename: Shigeru
authors.initials: S
authors.lastname: Oshima
authors.forename: Koichi
authors.initials: K
authors.lastname: Taniguchi