In Selective His Bundle Pacing, what kind of line is noted between pacing and QRS?

In Selective His Bundle Pacing, what kind of line is noted between pacing and QRS?

• A. U-shaped line
• B. Isoelectric line
• C. Wavy line
• D. Flat line

Answer: (B)

In Selective His Bundle Pacing, the relationship between the pacing stimulus and the QRS complex is characterized by an isoelectric line. This isoelectric line indicates a clear separation between the pacing spike and the ventricular depolarization that follows, which is reflected in the QRS complex. The significance of this runner is that it demonstrates effective capture of the His bundle without interference from other electrical activities in the heart. When pacing is done correctly in the His bundle, the timing of the pacing spike occurs ahead of the QRS complex, allowing for efficient conduction that leads to a properly synchronized ventricular contraction. The presence of the isoelectric line signifies that the pacing impulse is successfully conducted through the His-Purkinje system without premature ventricular activation, leading to a more physiologic and natural conduction pattern when compared to other pacing methods. This characteristic improves the overall cardiac function for patients requiring pacing intervention.

In Selective His Bundle Pacing, the relationship between the pacing stimulus and the QRS complex is characterized by an isoelectric line. This isoelectric line indicates a clear separation between the pacing spike and the ventricular depolarization that follows, which is reflected in the QRS complex. The significance of this runner is that it demonstrates effective capture of the His bundle without interference from other electrical activities in the heart.

When pacing is done correctly in the His bundle, the timing of the pacing spike occurs ahead of the QRS complex, allowing for efficient conduction that leads to a properly synchronized ventricular contraction. The presence of the isoelectric line signifies that the pacing impulse is successfully conducted through the His-Purkinje system without premature ventricular activation, leading to a more physiologic and natural conduction pattern when compared to other pacing methods. This characteristic improves the overall cardiac function for patients requiring pacing intervention.