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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 and Sinus Bradycardia Definition Causes and Treatment. Sinus tachycardia is a heart rate more than 100 beats/min. Fever, thyrotoxicosis, exercise, anaemia, lack of activity, hypertension etc. Drugs like Sorbitrate, .Nifedipine, nasal decongestants drops, atropine eye drops etc can cause tachycardia.