• First-degree heart block generally produces no symptoms, and in otherwise healthy individuals it usually does not progress to more serious forms. A notable exception to this is patients with heart failure, in whom first-degree heart block may further worsen the pumping function of the heart.

  • Type I second-degree heart block involves regularly occurring skipped beats, which patients may or may not notice. No other symptoms are generally reported, and the condition tends to resolve on its own.

  • Type II second-degree heart block may produce symptoms if the heart’s output of blood begins to decrease. These symptoms include dizziness or even fainting (syncope). Some people may feel confused or unsteady, or find that they are becoming easily fatigued. If any of these signs or symptoms are present, then treatment is warranted.

  • Third-degree heart block may produce any of the signs or symptoms associated with type II second-degree heart block, as well as symptoms somewhat like those preceding a heart attack. A patient is also at risk of convulsions and/or collapsing (due to cardiac arrest). This is the most severe form of heart block and the most likely form to be treated with a permanent pacemaker.