title: Permanent junctional reciprocating tachycardia in a dog.
abstract: A 5-year-old male English Bulldog was presented with a 1-year history of paroxysmal supraventricular tachycardia (SVT) partially responsive to amiodarone. At admission the surface ECG showed sustained runs of a narrow QRS complex tachycardia, with a ventricular cycle length (R-R interval) of 260 ms, alternating with periods of sinus rhythm. Endocardial mapping identified the electrogenic mechanism of the SVT as a circus movement tachycardia with retrograde and decremental conduction along a concealed postero-septal atrioventricular pathway (AP) and anterograde conduction along the atrioventricular node. These characteristics were indicative of a permanent junctional reciprocating tachycardia (PJRT). Radiofrequency catheter ablation of the AP successfully terminated the PJRT, with no recurrence of tachycardia on Holter monitoring at 12 months follow-up.
authors: Clinica Veterinaria Malpensa, Viale Marconi 27, 21017 Samarate, Varese, Italy. Electronic address: r.santilli@ecgontheweb.com.
authors: Roberto A
authors: RA
authors: Santilli
authors: Luis F N
authors: LF
authors: Santos
authors: Manuela
authors: M
authors: Perego
mesh_terms: D000818:Animals; D004283:Dog Diseases / Q000145:classification / Q000175:diagnosis / Q000473:pathology*; D004285:Dogs; D004562:Electrocardiography / Q000662:veterinary; D008297:Male; D013610:Tachycardia / Q000145:classification / Q000175:diagnosis / Q000473:pathology / Q000662:veterinary*
keywords: Accessory pathway; Arrhythmia; Canine; Electrocardiography; PJRT