Checkpoint: Upper Extremity NCS-Session

Video Transcription

Video Summary

In the video, Professor Mark Ferrante discusses how to localize and characterize lesions using electrodiagnostic testing. He begins by explaining the two main goals of electrodiagnostic testing, which are lesion localization and lesion characterization. To illustrate his points, Professor Ferrante presents several case studies. He explains that nerves can be injured in various ways, but their pathologic and pathophysiologic responses are limited to demyelination or axon loss. Demyelination can lead to conduction slowing or block, while axon loss results in valerian degeneration. He discusses how electrodiagnostic testing can help identify and localize these lesions, emphasizing the importance of running current through the nerve to observe abnormal responses. Professor Ferrante also highlights the significance of understanding the pathophysiology of demyelination and slowing. He demonstrates how lesions can be localized based on the response to different stimulation sites, and how axon loss can lead to changes in waveform morphology. Throughout the video, he emphasizes the importance of knowing the origin of the axons being studied and how it impacts lesion localization. He also provides insights into the timing and severity of lesions based on the presence of valerian degeneration and the decay of motor responses. In conclusion, Professor Ferrante provides summaries and interpretations of the case studies, showcasing how accurate lesion localization and characterization can be achieved through electrodiagnostic testing.

Keywords

electrodiagnostic testing

lesion localization

lesion characterization

nerves

demyelination

axon loss

conduction slowing

conduction block

valerian degeneration

waveform morphology

stimulation sites