What are causes of bradycardia?

What are causes of bradycardia?

Bradycardia can be caused by:

• A problem with your SA node (sick sinus syndrome)
• A problem with your AV node or any of the electrical pathways through the heart (heart block)
• Illness or medical problems such as:
  • Injury to the heart due to heart attack, endocarditis or a medical procedure
  • Inflammation of the heart muscle
  • Low thyroid function
  • Electrolyte imbalance in the blood
  • Sleep apnea
  • Congenital heart defect
  • Valvular heart disease
  • Lyme disease
• Certain medications, including beta blockers and heart rhythm medications