Clinical and electrocardiographic characterization of cattle with atrial premature complexes.

Peter D Constable, W. W. Muir, J. D. Bonagura, D. M. Rings, G. St Jean

Research output: Contribution to journalArticle

Abstract

Atrial premature complexes (APC) were identified in 16 cows over a 2-year period. Fourteen cows had concurrent gastrointestinal disease. Variation in the intensity of the first heart sound and an occasionally irregular heart rhythm were evident during thoracic auscultation. Neither cardiac murmurs nor pulse deficits were detected in any cows, and clinical signs of heart failure were lacking. Three cows had APC immediately prior to or after development of atrial fibrillation. The heart rate when APC were diagnosed ranged from 48 to 124 beats/min (mean, 77 +/- 20 beats/min), and the APC frequency ranged from less than 1 to 23/min (mean 9.4 +/- 8.0). The P-wave morphologic characteristics in 4 cows with APC was abnormal. The coupling index of the APC varied between 0.44 and 0.95, with a mean of 0.73. Aberrant ventricular activation was usually associated with a short coupling interval (coupling index less than 0.60) and was observed in 3 cows. Ten cows were determined to be hypocalcemic and 4 cows hypokalemic when APC were identified. Atrial ectopic activity could not be detected in 12 cows after resolution of the concurrent gastrointestinal disorder or electrolyte abnormality. Atrial premature complexes may be a functional cardiac disorder in cattle, unrelated to structural heart disease. The potential for APC to progress to sustained atrial arrhythmias such as atrial fibrillation should be considered.

Original languageEnglish (US)
Pages (from-to)1163-1169
Number of pages7
JournalJournal of the American Veterinary Medical Association
Volume197
Issue number9
StatePublished - Nov 1 1990
Externally publishedYes

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Atrial Premature Complexes
cows
cattle
digestive system diseases
Atrial Fibrillation
heart sounds
Heart Sounds
Heart Murmurs
Auscultation
Gastrointestinal Diseases
arrhythmia
heart diseases
chest
heart failure
Electrolytes
electrolytes
Pulse
Cardiac Arrhythmias
heart rate
Heart Diseases

ASJC Scopus subject areas

  • veterinary(all)

Cite this

Clinical and electrocardiographic characterization of cattle with atrial premature complexes. / Constable, Peter D; Muir, W. W.; Bonagura, J. D.; Rings, D. M.; St Jean, G.

In: Journal of the American Veterinary Medical Association, Vol. 197, No. 9, 01.11.1990, p. 1163-1169.

Research output: Contribution to journalArticle

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