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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.
Sinus bradycardia. Sinus bradycardia is a heart disorder characterized by the sinus node firing at a slow (<60 bpm) rate. Burrage H et al (2012) Sick sinus syndrome in a dog: treatment with dual-chambered pacemaker implantation. Trafny DJ et al (2010) Cardiac troponin-I concentrations in dogs with bradyarrhythmias before and after artificial pacing.