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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 Bradycardia. Sinus bradycardia is a heart rate below normal range for age. The rhythm originates in the sinus node, and ECG demonstrates a normal P-wave axis (upright in leads II and aVF) with a QRS following every P wave and a P wave preceding every QRS complex.