ComplicationsBy Mayo Clinic staff
The main complication of bundle branch block is a slow heart rate, which can sometimes require a pacemaker. A slow heart rate can occur whether the blockage is on the right or left side of your heart.
People who have a heart attack and develop a bundle branch block have a higher chance of complications, including sudden cardiac death, than do people who have heart attacks and don't develop a bundle branch block. Some people with bundle branch block after a heart attack need a temporary or permanent pacemaker.
Because bundle branch block affects the electrical activity of your heart, it can sometimes complicate the accurate diagnosis of other heart conditions, especially heart attacks, and lead to delays in proper management of those problems.
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