Bradyarrhythmias and Pacemaker Therapy in Dogs with Chagas Disease. (10th May 2013)

• Record Type: Journal Article
• Authors: Saunders, A.B.; Gordon, S.G.; Rector, M.H.; DeMaster, A.; Jackson, N.; Clubb, F.J.; Fosgate, G.T.; Miller, M.W.
• Is Part Of: Journal of veterinary internal medicine. Volume 27:Number 4(2013:Jul./Aug.)
• Page Start: 890
• Page End: 894
• Publication Date: 2013-05-10
• Subjects: Veterinary medicine -- Periodicals; 636.0896
• DOI: 10.1111/jvim.12098
• Languages: English
• ISSNs: 0891-6640

Abstract

<abstract abstract-type="main" id="jvim12098-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="jvim12098-sec-0001" sec-type="section"> <title>Background</title> <p>Chagas disease (Trypanosomiasis) is a cause of myocarditis in the southern United States causing cardiac conduction abnormalities, arrhythmias, and heart failure.</p> </sec> <sec id="jvim12098-sec-0002" sec-type="section"> <title>Objectives</title> <p>To report clinical findings and outcome in Chagas positive (CP) dogs requiring pacemaker implantation for bradyarrhythmias.</p> </sec> <sec id="jvim12098-sec-0003" sec-type="section"> <title>Animals</title> <p>One hundred and forty‐four client‐owned dogs requiring pacemaker implantation.</p> </sec> <sec id="jvim12098-sec-0004" sec-type="section"> <title>Methods</title> <p>Retrospective case series. Information regarding history, physical exam, laboratory and diagnostic imaging findings, treatment, and survival were obtained from medical records, with additional follow‐up information obtained by contacting referring veterinarians and owners.</p> </sec> <sec id="jvim12098-sec-0005" sec-type="section"> <title>Results</title> <p>Of the 144 dogs requiring pacemaker implantation from January 2001 to May 2010, 83 (57.6%) had a Chagas titer performed and 9 (10%) were CP. Concurrent ventricular arrhythmias (odds ratio 1.61, <italic>P</italic> = .005) or atrioventricular (AV) block (odds ratio 4.18, <italic>P</italic> < .001) increased the likelihood that a Chagas titer was submitted. Median age for CP dogs was 6.2 years (range, 0.3–10); 7 were male. Bradyarrhythmias included high‐grade 2nd or 3rd degree AV block (n = 8) and sinus bradycardia with 1st degree AV block (n = 1); 5 had concurrent ventricular arrhythmias. A positive Chagas titer had a negative impact on survival (hazard ratio 4.04; 95% CI 1.36–12.1, <italic>P</italic> = .012) with a reported median survival time of 365 days (interquartile range, 84–973 days).</p> </sec> <sec id="jvim12098-sec-0006" sec-type="section"> <title>Conclusions and Clinical Importance</title> <p>Bradyarrhythmias can result in clinical signs requiring pacemaker implantation in CP dogs, and although the diagnosis negatively impacts survival, pacemaker therapy is a viable treatment option.</p> </sec> </abstract>