Key result
A 9-year-old male dog with heart failure was found to have a rare combination of first-degree atrioventricular block and concealed ventricular preexcitation, which became manifest on ECG after treatment with AV nodal blocking agents.
Why the study?
The combination of first-degree atrioventricular block and occult ventricular pre-excitation had not previously been reported in a canine patient.
Case Report (n=1)
This case report documents the first known occurrence of concealed ventricular pre-excitation combined with first-degree atrioventricular block in a dog, which became manifest after AV nodal blocking therapy.
Documents rare canine first-degree AV block with occult pre-excitation; leaves open prevalence and clinical relevance in veterinary cardiology.
This article aims to present a case report of a canine patient with first-degree atrioventricular block and occult ventricular pre-excitation. A 9-year-old male dog, was referred for cardiological evaluation for suspected heart failure. The physical examination revealed a regular heart rhythm, loud holosystolic murmur over the left apex of the heart, accompanied by systolic thrill. Systolic blood pressure was 140 mmHg. The chest X-ray showed evidence of severe cardiomegaly and pulmonary edema, compatible with congestive heart failure. The echodoppler examination demonstrated presence of severe mitro-tricuspid insufficiency and enlargement of the four cardiac chambers. Serial electrocardiographic examination revealed presence of first-degree atrioventricular block concomitant with occult ventricular pre-excitation. To the best of our knowledge, the combination of such different electrocardiographic abnormalities wasn't reported before in a canine patient.
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Almeida et al. (2024) conducted a case report in First-degree atrioventricular block and concealed ventricular preexcitation (n=1). Medical management for heart failure (including amiodarone and diltiazem) was evaluated on Electrocardiographic findings. A 9-year-old male dog with heart failure was found to have a rare combination of first-degree atrioventricular block and concealed ventricular preexcitation, which became manifest on ECG after treatment with AV nodal blocking agents.
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