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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.
Normal sinus rhythm and sinus arrhythmia. 1  Spodick DH. Normal sinus heart rate: sinus tachycardia and sinus bradycardia redefined. Am Heart J 1992; 124:1119. 2  Spodick DH, Raju P, Bishop RL, Rifkin RD. Operational definition of normal sinus heart rate. Am J Cardiol 1992; 69:1245. 3  Mason JW, Ramseth DJ, Chanter DO, et al.