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If the beats are less than 60 per minute, it is called ‘bradycardia’ and if the beats are more than 100 per minute, it is called ‘tachycardia’. During some illnesses and other conditions, SA node slows down or works at a Faster rate. This condition is called sinus bradycardia or sinus tachycardia, respectively.

Causes of Sinus Bradycardia :

  1. While resting / Sleeping
  2. Old age ( more than 65-70 years)
  3. Hypothyroidism
  4. Some medicines (e.g. Beta-Blockers)

Causes of Sinus Tachycardia :

  1. While doing physical exertion
  2. During anxiety or mental stress
  3. Fever / infection
  4. Anaemia : reduced blood 
  5. Deficiency of certain vitamins
  6. Weak heart / heart failure
  7. Hyperthyroidism