Action Potential Characteristics in the Sinus Venosa of Patients With and Without Atrial Flutter

Background: A functional line of conduction block is often observed in the sinus venosa (SV) during typical atrial flutter (AFL). Little information, however, is available as to the action potential characteristics in the SV with respect to the functional block. Methods and Results: Monophasic actio...

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Bibliographic Details
Published in:Circulation Journal 2009, Vol.73(4), pp.647-653
Main Authors: Harada, Masahide, Osaka, Toshiyuki, Yokoyama, Eriko, Takemoto, Yoshio, Ito, Atsushi, Kodama, Itsuo
Format: Article
Language:English
Subjects:
Action Potentials
Adult
Aged
Atrial flutter
Atrial Flutter - physiopathology
Electrocardiography
Female
Heart Atria - physiopathology
Humans
Male
Middle Aged
Monophasic action potential
Restitution
Sinus venosa
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Summary:Background: A functional line of conduction block is often observed in the sinus venosa (SV) during typical atrial flutter (AFL). Little information, however, is available as to the action potential characteristics in the SV with respect to the functional block. Methods and Results: Monophasic action potentials (MAPs) from the SV and lateral wall of the right atrium were recorded in 7 patients with paroxysmal AFL and 11 control patients. For both the control and AFL patients, the MAP duration at 90% repolarization (MAPD90) in the SV was longer, and the MAPD90 restitution slope was less steep than in the lateral wall. The MAPD90 in the SV in the AFL patients was slightly longer than that in the controls at the shortest cycle length (CL) tested (300 ms). However, the MAPD90s at longer CLs (350-700 ms), as well as the MAPD90 restitution slopes in the SV were comparable between the 2 groups. Conclusions: The MAPs in the SV are characterized by a long duration and flat restitution kinetics in humans. MAP properties to facilitate the development of conduction block in the SV are not appreciable in patients with paroxysmal typical AFL. (Circ J 2009; 73: 647 - 653)
ISSN:1346-9843
1347-4820
DOI:10.1253/circj.CJ-08-0748