Heart Block

         Basic Facts

  • Heart block is an abnormality of the spread or flow of electrical activity from the upper heart chambers, the atria, to the lower chambers of the heart, the ventricles.
  • Heart block results in an abnormality or disturbance in the rate or rhythm of the heartbeat.
  • Heart block occurs in three levels of severity. First-degree block is a delay of the signal that stimulates the ventricles to contract, second-degree block is a partial or intermittent interruption of the signal that stimulates the ventricles to contract, and third-degree block is a complete interruption of the signal that stimulates the heart to contract.
Heart block is a disorder of impulse conduction, meaning that an electrical impulse is impaired from traveling along its normal pathway. 

Heart Block FAQ