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Biology

Understanding Cardiac Conduction Anatomy Behind Bundle Branch Blocks

Quick fact

Bundle branch blocks occur when the electrical impulse is delayed or blocked in one of the two main branches of the His bundle, causing the ventricles to contract out of sync. Remarkably, a right bundle branch block can be a normal finding in healthy young people, while a left bundle branch block often signals underlying heart disease.

Why this is interesting

You know the heart has four chambers, but did you know it has a built-in electrical wiring system? When part of that wiring breaks, the heart still beats—but the pattern of its beat changes in a way you can see on an ECG.