FREQUENCY OF 2ND-DEGREE ATRIOVENTRICULAR HEART-BLOCK IN DOGS

  • 1 January 1975
    • journal article
    • research article
    • Vol. 36  (7) , 925-929
Abstract
Clinically normal adult dogs and pups 8 to 24 weeks of age were monitored for 2nd-degree atrioventricular (AV) heart block. Radiotelemetry was used to obtain the electrocardiogram (ECG) of resting, unanesthetized, unrestrained dogs. Second-degree AV heart block was detected in 64% of 11 adult dogs and 100% of 12 pups between 8 and 11 weeks of age. The dropped beats, prolonged P-R intervals, and prolonged P-P intervals appeared to be associated with the respiratory cycle. Atropine quickly reduced the frequence of dropped beats. It was concluded that occasional dropped ventricular beats due to 2nd-degree AV heart block may be normal in dogs, especially young dogs.

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