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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.
A sinus rhythm faster than the normal range is called a sinus tachycardia, while a slower rate is called a sinus bradycardia. (See Sinus tachycardia: Evaluation and management and Sinus bradycardia.) The sinoatrial (SA) node, due to its small mass, does not have a visible manifestation on the ECG.