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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 is a heart disorder characterized by the sinus node firing at a slow (<60 bpm) rate. Causes of sinus bradycardia include: Sick sinus syndrome ('brachy-tachy' syndrome) associated with mitral dysplasia. Atrial tachycardia. Pericarditis. Bundle branch block. Atrial standstill. Normal physiology in Greyhounds.