By Mayo Clinic Staff

Complications of untreated bradycardia vary depending on how slow the heart rate is, where the electrical conduction problem occurs and what kind of damage may be present in heart tissue.

If bradycardia is significant enough to cause symptoms, possible complications of the slow heart rate may include:

  • Frequent fainting spells
  • Inability of the heart to pump enough blood (heart failure)
  • Sudden cardiac arrest or sudden death
May 07, 2014