Equis ISSN 2398-2977

Heart: atrioventricular block - 1st degree

Synonym(s): 1st degree AVB

Contributor(s): Karen Blissitt, Christopher Brown, Wendy Furness, Lesley Young, Nicola Menzies-Gow

Introduction

  • A delay of conduction of the atrial impulse at the AV node.
  • Cause: usually high vagal tone.
  • Signs: asymptomatic.
  • Diagnosis: ECG.
  • Treatment: usually unnecessary.
  • Prognosis: excellent.

Pathogenesis

Etiology

Predisposing factors

Specific

  • Drug-induced.

Pathophysiology

  • High vagal tone leads to delay of conduction of the impulse at AV node.
  • Drug-induced.

Diagnosis

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Treatment

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Outcomes

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Wagner A E et al (1991) Cardiovascular effects of xylazine and detomidine in horses. Am J Vet Res 52 (5), 651-657 PubMed.

Other sources of information

  • Marr C M & Bowen I M (2010) Eds Cardiology of the Horse. 2nd edn. Saunders Ltd, UK. ISBN: 9780702028175.


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