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Merck Manual
Veterinary Manual
The trusted provider of veterinary information since 1955

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VETERINARY PET
ECG, high-grade second-degree atrioventricular (AV) block, dog
ecg-high-grade-second-degree-atrioventricular-block-dog-kittleson-sized
ECG, high-grade second-degree atrioventricular (AV) block, dog

    Each QRS complex (R) on this ECG of a dog is accompanied by two or three P waves. This indicates that the SA node depolarization is only traversing the AV node 1 out of every 2 or 3 times.

Courtesy of Dr. Mark D. Kittleson.

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Heart Disease: Conduction Abnormalities in Dogs and Cats

Merck & Co., Inc., Rahway, NJ, USA (known as MSD outside of the US and Canada) is dedicated to using the power of leading-edge science to save and improve lives around the world.  The Merck Veterinary Manual was first published in 1955 as a service to the community.  The legacy of this great resource continues as the Merck Veterinary Manual in the US and Canada and the MSD Vet Manual outside of North America.

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