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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.
1 sinus bradycardia: the heart beats very slowly, less than 60 beats per minute. 2  sinus arrest or sinus pause: the sinus node temporarily stops working or pauses, causing a change in the heartâs beating.  sinoatrial block: the sinus node impulse is blocked from reaching the atria, the two upper chambers of the heart.