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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.
Sinus tachycardia is a normal increase in the heart rate. The sinoatrial (SA) node --- the heart's natural pacemaker - sends out electrical signals faster than usual. The heart rate is fast, but the heart beats properly. Causes of sinus tachycardia. A rapid heartbeat may be your body's response to common conditions such as: