What is third-degree heart block?
Heart block refers to a slowdown or blockage of the electrical signals that travel from the upper to lower chambers of the heart.
- Reviewed by Jonathan W. Waks, MD, Contributor
Heart block is a slowdown or blockage of the electrical signals that travel from the upper to lower chambers of the heart. People with third-degree heart block (the most serious form) nearly always need a permanent pacemaker.
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About the Author
Julie Corliss, Executive Editor, Harvard Heart Letter
About the Reviewer
Jonathan W. Waks, MD, Contributor
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