The heart rate less than 60 in adults and less than 100,80 and 70 in infants, toddlers and school going children respectively is termed as sinus bradycardia. It can be a normal phenomenon or may be due to some pathological causes. The causes and the management have been spotlighted in this passage.


  • A normal phenomenon
  • Myocardial infarction
  • Sinus node disease
  • Hypothermia
  • Raised intracranial pressure
  • Hypothyroidism
  • Cholestatic jaundice
  • Drugs induced (beta blockers, digoxin, verapamil)


In the asymptomatic patients there is no need of any kind of treatment whilst in symptomatic patients, intravenous atropine (0.6-1.2 mg) is given. Moreover, in recurrent or persistent bradycardia pacemaker implantation should be considered.  

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