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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.
There are two basic types of bradycardia: 1  Sick sinus syndrome occurs when the sinus node (the heart's own pacemaker) fails and does not reliably trigger heartbeats. 2  Heart block is a complete or partial interruption of the electrical impulses on their way to the ventricles and results in a slow, unreliable heartbeat.