There are three types of heart block. Heart block is a condition where the electrical impulses travelling from the upper chambers (atria) to the lower chambers (ventricles) are either: delayed (first degree), intermittently blocked (second degree), or completely blocked (third degree, also called complete heart block). First degree is usually harmless and requires no treatment. Second degree may require monitoring or a pacemaker depending on the type and symptoms. Third degree almost always requires a permanent pacemaker.
