%0 Journal Article
%T Orthodromic Atrioventricular Reciprocating Tachycardia in a Dalmatian
%A Marlos G. Sousa
%A Stephany B. Lucina
%A Roberta Carareto
%J Open Journal of Veterinary Medicine
%P 1-8
%@ 2165-3364
%D 2018
%I Scientific Research Publishing
%R 10.4236/ojvm.2018.81001
%X Supraventricular tachyarrhythmias may be caused by macroreentry circuits involving the AV node and accessory pathways. This paper reports a case of suspected orthodromic atrioventricular reciprocating tachycardia in an 18-month-old Dalmatian admitted with dyspnea and a lifelong history of fatigue. Cardiac auscultation documented a regular fast pace with no heart murmurs. The electrocardiogram characteristics were consistent with supraventricular tachycardia, with very regular RR interval and narrow QRS complexes. At lead II, we identified negative P waves buried within the ST segment, which resulted in a RP-to-PR ratio of 0.60, but in aVR these P waves were positive, suggesting a retrograde conduction of electrical impulses throughout the atrial myocardium. The echocardiographic study showed volume overload, and a decreased fractional shortening was calculated when SVT was sustained, highlighting its impact on systolic function. This is likely the first description of an orthodromic atrioventricular reciprocating tachycardia in a Dalmatian, and although cardiac mapping was not available to confirm this suspicion, all electrocardiograpic features were supportive of such arrhythmia.
%K Arrhythmia
%K Tachycardiomyopathy
%K Accessory Pathway
%K Reentrant Arrhythmia
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=81908