People with third degree heart block have an irregular heartbeat due to a total blockage of the electrical impulses that control the heart’s activity. It can lead to faintness and breathing difficulty ...

Medically reviewed by Christopher Lee, MDMedically reviewed by Christopher Lee, MD Heart block is a delay or disruption within the heart's electrical conduction system that controls the rhythm and ...

Complete heart block means that there’s a complete separation of electrical activity between the upper and lower chambers of the heart. Without prompt medical attention, it can be fatal. Your heart ...