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Sinus bradycardia can be the result of many things including good physical fitness, medications, and some forms of heart block. Sinus refers to the sinus node, the heart's natural pacemaker which creates the normal regular heartbeat.
Abnormal Heart Rhythm in Dogs. Sinus Bradycardia in Dogs. Sinus bradycardia (SB) is indicated by a slower-than-normal rate of impulses in the sinus node. Also called the sinoatrial node (SAN), the sinus node initiates the electrical impulses within the heart, triggering the heart to beat or contract.