First-degree atrioventricular block
This condition is frequently observed in dogs over 8 years of age and is associated with neuronal degeneration within the through the atrioventricular junction and bundle of His.
ECG studies usually show P-R intervals >0.13 secs in the presence of normal sinus rhythm.
In most dogs, this is usually an incidental finding on ECG, but comprehensive thoracic radiography, echocardiography and blood pressure measurement should be taken to exclude underlying cardiac diseases.
- Kovacevic A & Sastravaha A (2007) Clinically silent atrial dissociation in a dog. J Vet Cardiol 9(2):135-137