Electrodiagnostics - Nerve Conductions | Lecture Note - Edubirdie

University:
The University Of Western Ontario
Course:
Biology 2290F | Scientific Method in Biology
Academic year:

2022
Views:

485

Pages:

2
Author:

Kyuwon J.

Electrodiagnostics ● Used for evaluation on neuromuscular disorders ○ Physical exams+imaging are inconclusive ● Functional assessments on nerves and muscle integrity ● Modalities ○ Nerve Conduction Studies ○ Electromyography Nerve conductions ● Assess function of peripheral nerves ● Electrical stimulus is applied => recording conduction velocity + amplitude ○ Slowed velocity ■ Demyelinations ■ Gillian Barrie ■ Charcot Marie tooth ○ Reduced amplitude ■ Axonal loss ■ Trauma ■ Radiculopathy ● Orthopaedic application ○ Carpal tunnel syndrome ■ Median nerve ○ Ulnar neuropathy on elbow ○ Peroneal nerve palsy ○ Brachial plexus injury Electromyography ● Assess motor units activity in muscles ● Needle electrode ○ Spontaneous activity in rest ■ fibrillation ■ Positive sharp waves ■ Denervation ○ Motor unit potentials in contractions ■ Polyphasic pattern ■ Indicates reinnervations ● Differentiate between ○ Neuropathy vs mayopathy ○ Acute vs chronic denervation ○ Root level vs peripheral nerve lesions Clinical Applications ● Radiculopathy ○ EMG used to identify denervation within myotomal patterns ○ Distinguish from peripheral entrapment ○ Neuropathy ● Peripheral nerve entrapments ○ NCS confirmation sites and severity ● Plexopathy ○ EMG/NCS ○ Differentiated from root lesions ● Neuromuscular junction disorders ○ Repetitive stimulation showing decremental responses ○ Myasthenia gravis ● Muscle disease ○ EMG in small short duration potentials ○ Myopathic patterns

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