What can be seen on the EKG indicating slowed conduction velocity at the AV node?

What can be seen on the EKG indicating slowed conduction velocity at the AV node?

• A. The QRS complex
• B. A P wave
• C. A flat line between the P wave and QRS complex
• D. An elevated T wave

Answer: (C)

The presence of a flat line between the P wave and the QRS complex on an EKG indicates a delay in conduction at the AV node, which is a classic sign of heart block. In this scenario, the flat line, often referred to as a "PR interval" that is prolonged, suggests that there is a disruption in the normal transmission of electrical impulses from the atria to the ventricles. This delay can manifest as a significant gap on the EKG tracing, indicating that the impulse generated by the atria (P wave) is not being quickly or effectively propagated to the ventricles (QRS complex).

In cases of first-degree AV block, for example, this results in a consistent elongation of the PR interval, representing slow conduction through the AV node. Understanding this characteristic is crucial in interpreting EKGs, as it provides insight into the electrical activity and potential dysfunction of the cardiac conduction system.