Third-Degree Atrioventricular Block

Amara Estrada, DVM, DACVIM (Cardiology) University of Florida

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Normal-rate atrial contractions are followed by a slower ventricular escape rate in this dog with third-degree atrioventricular (AV) block. Typically, atrial contractions are not auscultated this clearly in cases of third-degree AV block; however, atrial contractions are heard very well in this patient (a lean Boxer dog).

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