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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.
In other cases, however, sinus bradycardia can be caused by a diseased or damaged sinus node and may require treatment with a pacemaker. At rest, the electrical impulses generated by the sinus node typically occur between 50-60 and 100 times per minute. This is called normal sinus rhythm..