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 ...

First-degree heart block is the mildest type and often requires no treatment. Third-degree heart block is the most severe and ...

ECG and EKG are different abbreviations for the same test, called an electrocardiogram. This test measures how electricity is functioning in a person’s heart. People may also refer to it as an ...