sinus bradycardia

sinus bradycardia,

beating of the sinus node at a rate below 60/min.

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bradycardia

slowness of the heartbeat, in dogs and cats to less than 60 beats per minute.

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sinus bradycardia

a slow sinus rhythm, characterized by normal electrocardiographic complexes in a normal rhythm or a sinus arrhythmia. A normal finding, most commonly seen in large breeds of dogs or athletic animals.

Sinus bradycardia in a dog. By permission from Ettinger SJ, Feldman E, Textbook of Veterinary Internal Medicine, Saunders, 2004

bradycardia-tachycardia syndrome

see sick sinus syndrome.

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sinus bradycardia

Cardiology Sinus-node dysfunction–sick sinus syndrome characterized by a normal P-wave axis of < 60 beats/min EKG Every P wave is followed QRS complexes , or at < 50 beats/min. See Sick sinus syndrome. Cf Sinus tachycardia.