Neurology Exam Prep Podcast Episode 40 - Basics of EMG and Nerve Conduction Studies
38 snips
Dec 20, 2021 A practical tour of EMG and nerve conduction studies, from reading latency, speed, and signal strength to recognizing conduction block and late responses. The discussion also explores needle EMG findings such as spontaneous muscle activity and motor unit recruitment, and how these tests fit into a focused neurological exam.
AI Snips
Chapters
Transcript
Episode notes
EMG and NCS
- EMG and nerve conduction studies are distinct tests.
- They are often performed together and referred to as "EMG."
Test Setups
- Both EMG and nerve conduction studies use a differential amplifier setup.
- Nerve conduction studies use external stimulation, while EMGs use voluntary muscle activation.
Interpreting Nerve Conduction
- Myelin integrity is assessed by nerve conduction speed/latency.
- Axonal integrity is reflected in the amplitude of the nerve signal.