Anatomic distribution and electrophysiologic properties of accessory atrioventricular pathways in dogs

Roberto A. Santilli Clinica Veterinaria Malpensa, Via Marconi, 27, 21017 Samarate, Varese, Italy

Search for other papers by Roberto A. Santilli in
Current site
Google Scholar
PubMed
Close
 DVM
,
Gianmario Spadacini Università degli Studi dell'Insubria, Facoltà di Medicina, Via Ravasi, 2, 21100 Varese, Italy

Search for other papers by Gianmario Spadacini in
Current site
Google Scholar
PubMed
Close
 MD
,
Paolo Moretti Università degli Studi dell'Insubria, Facoltà di Medicina, Via Ravasi, 2, 21100 Varese, Italy

Search for other papers by Paolo Moretti in
Current site
Google Scholar
PubMed
Close
 MD
,
Manuela Perego Clinica Veterinaria Malpensa, Via Marconi, 27, 21017 Samarate, Varese, Italy

Search for other papers by Manuela Perego in
Current site
Google Scholar
PubMed
Close
 DVM
,
Alberto Perini Clinica Veterinaria Malpensa, Via Marconi, 27, 21017 Samarate, Varese, Italy

Search for other papers by Alberto Perini in
Current site
Google Scholar
PubMed
Close
 DVM
,
Serena Crosara Facoltà di Medicina Veterinaria, Dipartimento di Patologia Animale, Via L da Vinci, 44–10095 Grugliasco, Torino, Italy

Search for other papers by Serena Crosara in
Current site
Google Scholar
PubMed
Close
 DVM
, and
Alberto Tarducci Facoltà di Medicina Veterinaria, Dipartimento di Patologia Animale, Via L da Vinci, 44–10095 Grugliasco, Torino, Italy

Search for other papers by Alberto Tarducci in
Current site
Google Scholar
PubMed
Close
 DVM

Click on author name to view affiliation information

Abstract

Objective—To evaluate the anatomic distribution and electrophysiologic properties of accessory pathways (APs) in dogs.

Design—Case series.

Animals—10 dogs with tachyarrhythmias associated with an AP.

Procedures—Each dog underwent electrophysiologic testing to determine the inducibility of documented and undocumented arrhythmias and to identify location, conduction properties, and antegrade and retrograde effective refractory periods of the APs. Radiofrequency catheter ablation was then performed.

Results—15 APs were identified; 7 dogs each had a single AP, and 3 had multiple APs. Fourteen of the 15 APs were right-sided (6 right free wall, 4 posteroseptal, 3 midseptal, and 1 anteroseptal), and 1 was left-sided (left free wall). All APs conducted in an all-or-none fashion. Unidirectional retrograde conduction was observed in 11 APs, and bidirectional conduction was observed in 4. All documented tachyarrhythmias could be induced during electrophysiologic testing; atrial fibrillation was also inducible in 2 dogs. Mean ± SD cycle duration of orthodromic atrioventricular reciprocating tachycardia was 215.80 ± 44.87 milliseconds. Mean shortest R-R interval during atrial fibrillation was 247.33 ± 83.17 milliseconds.

Conclusions and Clinical Relevance—Results suggested that in dogs, most APs are right-sided, had unidirectional retrograde conduction, and are associated with various arrhythmias, including orthodromic atrioventricular reciprocating tachycardia and atrial fibrillation without evidence of pre-excitation.

Abstract

Objective—To evaluate the anatomic distribution and electrophysiologic properties of accessory pathways (APs) in dogs.

Design—Case series.

Animals—10 dogs with tachyarrhythmias associated with an AP.

Procedures—Each dog underwent electrophysiologic testing to determine the inducibility of documented and undocumented arrhythmias and to identify location, conduction properties, and antegrade and retrograde effective refractory periods of the APs. Radiofrequency catheter ablation was then performed.

Results—15 APs were identified; 7 dogs each had a single AP, and 3 had multiple APs. Fourteen of the 15 APs were right-sided (6 right free wall, 4 posteroseptal, 3 midseptal, and 1 anteroseptal), and 1 was left-sided (left free wall). All APs conducted in an all-or-none fashion. Unidirectional retrograde conduction was observed in 11 APs, and bidirectional conduction was observed in 4. All documented tachyarrhythmias could be induced during electrophysiologic testing; atrial fibrillation was also inducible in 2 dogs. Mean ± SD cycle duration of orthodromic atrioventricular reciprocating tachycardia was 215.80 ± 44.87 milliseconds. Mean shortest R-R interval during atrial fibrillation was 247.33 ± 83.17 milliseconds.

Conclusions and Clinical Relevance—Results suggested that in dogs, most APs are right-sided, had unidirectional retrograde conduction, and are associated with various arrhythmias, including orthodromic atrioventricular reciprocating tachycardia and atrial fibrillation without evidence of pre-excitation.

All Time Past Year Past 30 Days
Abstract Views 159 0 0
Full Text Views 904 793 211
PDF Downloads 327 197 10
Advertisement