What is a bundle branch block?

What is a bundle branch block?

• A. A delay in the conduction through the AV node
• B. A blockage in the right or left bundle branch
• C. An interruption in the conduction of the SA node
• D. A complete cessation of all electrical conduction

Answer: (B)

A bundle branch block refers specifically to a disruption or delay in the electrical conduction through one of the bundle branches, which are pathways that conduct impulses from the bundle of His to the ventricular myocardium. This condition can occur in either the right or left bundle branch, leading to characteristic changes in the EKG patterns, such as a widening of the QRS complex and distinctive changes in the shape of the QRS wave.

In essence, this blockage arises when there is a delay in the propagation of impulses due to structural or functional issues within the myocardial tissue of the respective bundle branch. This can affect the synchronous contraction of the ventricles and can be indicative of underlying heart disease or conditions affecting the conduction system. Understanding this concept is crucial for correctly interpreting EKG findings and assessing the patient's cardiac health.