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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.
Bradycardia means the heart beats slowly (fewer than 60 times a minute). Tachycardia means the heart beats very fast (more than 100 times per minute). Most donors are unable to donate blood with a pulse of more than 100 beats per minute or less than 50 beats per minute.