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Clinical and electrocardiographic presentations of transient trifascicular block in three cats

Eva M Oxford1, Flavia B Giacomazzi1, N Sydney Moïse1

  • 1Cornell University College of Veterinary Medicine, 930 Campus Road, 14853, Ithaca, NY, USA.

Journal of Veterinary Cardiology : the Official Journal of the European Society of Veterinary Cardiology
|March 25, 2018
PubMed

Insights

Transient trifascicular block in cats can resolve with medical management. This condition, indicated by ECG abnormalities and elevated cardiac troponin I, suggests myocarditis but is often reversible.

Area of Science:

  • Veterinary Cardiology
  • Electrophysiology

Background:

  • Trifascicular block, a rare conduction abnormality, affects the His-Purkinje system.
  • Understanding its presentation and prognosis in felines is crucial for diagnosis and treatment.

Observation:

  • Three cats presented with lethargy, inappetence, and elevated cardiac troponin I.
  • Electrocardiograms revealed various conduction delays, including first-degree atrioventricular (AV) block, right bundle branch block, and left anterior fascicular block.
  • One cat exhibited paroxysmal third-degree AV block, confirming trifascicular block.

Findings:

  • All three cats demonstrated transient trifascicular block.
  • Elevated cardiac troponin I levels suggested concurrent myocarditis.
  • Complete recovery of sinus rhythm was achieved in all cats within weeks of medical management.

Implications:

  • Transient trifascicular block in cats is a potentially reversible condition.
  • Prompt diagnosis and medical intervention can lead to favorable outcomes.
  • Myocarditis may be an underlying cause or associated condition, responding to treatment.

Keywords:
Atrioventricular blockBundle branch blockMyocarditisTroponin I

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