What is it called when there is a normal QRS pattern with an R, R' configuration?

What is it called when there is a normal QRS pattern with an R, R' configuration?

• A. An incomplete bundle branch block
• B. A complete bundle branch block
• C. A first-degree AV block
• D. A junctional escape rhythm

Answer: (A)

In the context of an EKG tracing, a normal QRS pattern with an R, R' configuration indicates that there is an incomplete bundle branch block. The R, R' configuration means that there is a secondary R wave present, which is typically seen in incomplete blocks.

In a complete bundle branch block, the QRS is prolonged and shows more distinct changes compared to the normal pattern, while in first-degree AV block, the PR interval is prolonged but the QRS configuration remains normal. A junctional escape rhythm involves a different pattern characterized by narrow QRS complexes and specific P wave characteristics but does not exhibit the R, R' configuration.

Therefore, the presence of a normal QRS with an R, R' pattern specifically points to an incomplete bundle branch block, making it the correct answer in this context.