HRS Board Review 2025 New Courses (Reviewers Copy)-Workshop 1_Electrocardio_Miller_2025

Video Transcription

Third question, the three-year-old man undergoes electrophysiologic study for evaluation of recurrent syncope.  Ventricular pacing is performed and based on the recordings and the tracing attached, you conclude retrograde conduction is present over the AV node, retrograde conduction is  present over right lateral accessory pathway, retrograde conduction is absent, block is  in the hysperkinesis system, retrograde conduction is absent with block in the AV node, or retrograde conduction is absent but cytoblock is indeterminate. Here's the tracing.

Video Summary

In this case, a three-year-old man is undergoing electrophysiologic study for evaluation of recurrent syncope. During ventricular pacing, the test aims to assess retrograde conduction pathways. The options to conclude from the study include detecting retrograde conduction over the AV node or a right lateral accessory pathway, or identifying absence of retrograde conduction due to a block in specific areas such as the His-Purkinje system or the AV node, or determining if the presence of a block is indeterminate. The outcome depends on analyzing the provided tracings, although they are not visible in this summary.

Keywords

electrophysiologic study

recurrent syncope

retrograde conduction

ventricular pacing

AV node