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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.
Relevance. Rating Newest Oldest. Best Answer: sinus bradycardia means slow heart rate sinus arrythmia means heart is not beating in the normal rythym but the heart beat is still starting in the right place. Many people live wiht this for their whole lives and never even know they have it. Stress less. Source(s): experience.