In pacing responses, which term describes pacing that captures the chamber without eliciting a His bundle signal?

In pacing responses, which term describes pacing that captures the chamber without eliciting a His bundle signal?

• A. VANERP
• B. AVNERP with His capture
• C. AVNERP with no His signal
• D. AVNERP

Answer: (C)

When pacing, you can activate the ventricular chamber directly without engaging the His-Purkinje system. If you observe a ventricular capture but no His bundle signal on the intracardiac ECG, the impulse crosses the ventricle without depolarizing the His bundle. That scenario is described as AVNERP with no His signal. The absence of a His signal clearly indicates the His bundle wasn’t captured, which is exactly what this term denotes. The other options either imply there is His capture (which would show a His signal) or are vague about whether the His bundle is engaged, so they don’t fit the described pacing response.

When pacing, you can activate the ventricular chamber directly without engaging the His-Purkinje system. If you observe a ventricular capture but no His bundle signal on the intracardiac ECG, the impulse crosses the ventricle without depolarizing the His bundle. That scenario is described as AVNERP with no His signal. The absence of a His signal clearly indicates the His bundle wasn’t captured, which is exactly what this term denotes.

The other options either imply there is His capture (which would show a His signal) or are vague about whether the His bundle is engaged, so they don’t fit the described pacing response.