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Unique Electrophysiological Properties of Fast‐slow Atrioventricular Nodal Reentrant Tachycardia Characterized by a Shortening of Retrograde Conduction Time via a Slow Pathway Manifested During Atrial Induction by Tamura, Shuntaro; Nakajima, Tadashi; Iizuka, Takashi; Hasegawa, Hiroshi; Kobari, Takashi; Kurabayashi, Masahiko; Kaneko, Yoshiaki is a Medicine article available to read on EtoBox.

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## Introduction: Electrophysiological properties of reentry circuits of fast-slow atrioventricular nodal reentrant tachycardia (f/s-avnrt) may contribute to cyclic variability after atrial induction. ## Methods: In 156 atrial inductions of 33 patients with f/s-avnrt, we measured the atrio-his (ah) and his-atrial (ha) intervals in the first cycle after the induction (ah[1] and ha[1], respectively), those in the second cycle (ah [2] and ha [2], respectively), and those during tachycardia that maintained a stable cycle length ah[t] and ha[t], respectively), and calculated the value of ah(1) minus ah(t) [δah] and the value of ha(1) minus ha(t) [δha] in each induction. according to the sum of δah and δha, tachycardia variability was classified as incremental ( 20). ## Results: Δah and δha were significantly different between the three responses: 6 ± 28 and -67 ± 39 in 55 inductions (35%) with an incremental response, 20 ± 10 and -23 ± 28 in 59 (38%) with a balanced response, and 54 ± 44 and 4 ± 50 in 42 (27%) with a decremental response, respectively. incremental response was reproducibly and consistently observed in 33% of patients. ha(2) was similar to ha(t) in inductions with an incr

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Author

Tamura, Shuntaro; Nakajima, Tadashi; Iizuka, Takashi; Hasegawa, Hiroshi; Kobari, Takashi; Kurabayashi, Masahiko; Kaneko, Yoshiaki

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Futura Publishing Company, Inc; Blackwell Publishing Inc.; Wiley (ISSN 1540-8167)

Published

2020

Language

EN

Field

Medicine (Health Sciences)