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9. How Do EKGs Help Diagnose a Bundle Branch Block?

An EKG tracks the electrical activity of the heart and records it on paper to create a visual representation of a heartbeat. The strength and timing of the electrical activity are represented by different parts of the tracing. The first bump is the P-wave, which represents the firing of the AV node. Next is the QRS-complex, which follows the electrics impulse as it travels through the ventricles. This includes the branch bundles and the Purkinje fibers. The T-wave is next and shows when the ventricles relax. A trained professional can tell a lot from these tracings by looking at the distances between each wave, as well as other factors.

EKG Waves Tracings QRS muratseyit / Getty Images

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