Artificial cardiac pacemaker placement in dogs with a cohort of myocarditis suspects and association of ultrasensitive cardiac troponin I with survival.

J Vet Cardiol

Department of Small Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, 4474 TAMU, College Station, TX 77843-4474, USA.

Published: April 2019

AI Article Synopsis

  • The study investigates the effects of artificial cardiac pacemakers (APs) on dogs with bradyarrhythmias and potential myocarditis, focusing on the role of ultrasensitive cardiac troponin I (US-cTnI) concentrations.
  • A total of 110 dogs were analyzed, with 64 having preprocedural US-cTnI levels categorized into three groups based on severity, leading to varied median survival times.
  • Although US-cTnI had a mild negative association with survival, age was found to be a more significant factor, and while sudden death may be more prevalent in dogs suspected of having myocarditis, their survival rates were comparable to the overall population.

Article Abstract

Introduction: Artificial cardiac pacemakers (APs) are a common treatment for symptomatic bradyarrhythmias in dogs, some of which may be triggered by underlying myocarditis. Severely elevated cardiac troponin I (cTnI) concentrations support a diagnosis of myocarditis. The association of ultrasensitive-cTnI (US-cTnI) concentration with survival in a large cohort of dogs receiving APs is not described.

Animals, Materials, And Methods: The study included 110 dogs receiving APs over a 5-year period. Medical records were retrospectively reviewed to characterize the entire population receiving APs, with further analysis in dogs with preprocedural US-cTnI concentrations (n = 64) classified as normal/group 1 (n = 11), mildly to moderately elevated/group 2 (n = 27), and severely elevated/myocarditis suspects/group 3 (n = 26).

Results: Median survival time was 1079 days for the entire population, 1167 days for group 2, 949 days for group 3, and not met in group 1. There was not a statistically significant difference in survival between group 2 and group 3. Overall, US-cTnI had a mild, negative association with survival. Age had a stronger negative association. Infectious etiologies were identified in a minority of group 3 cases. A possible association between severely elevated US-cTnI and a sudden death outcome was noted.

Conclusions: The negative association of US-cTnI with survival outcomes was mild, with age having a larger effect. Although a sudden death outcome may be seen more commonly in myocarditis suspects, group 3 survival time was similar to that of the entire canine population. Plausible infectious causes of myocarditis were infrequently identified.

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Source
http://dx.doi.org/10.1016/j.jvc.2018.09.003DOI Listing

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