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3. What Happens in a Bundle Branch Block?

A bundle branch block occurs when something interferes with the electrical impulse traveling through the bundle branches on their way to the ventricles. Causes include heart attacks, blood clots in the lungs, or cardiac infections. This interruption can cause the heart to pump less efficiently because it interferes with the ventricles' ability to contract and coordinate with the rest of the heart. Depending on the severity, bundle branch blocks can cause significant problems throughout the body, though mild cases often display no symptoms.

EKG Bundle Branch Block enot-poloskun / Getty Images

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This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.