NCS-ELECTRODIAGNOSTIC STUDIES

SUMMARY

TYPES OF ELECTRODIAGNOSTIC STUDIES

1. Sensory nerve action potentials (SNAP) & compound nerve action potentials (CNAP): both involve electrical stimulation of nerves and recording of the synchronized discharge of axons within the nerve at some distance from the point of stimulation.

2. Compound muscle action potentials (CMAP): involve electrical stimulation of the nerve and recording of the synchronized discharge of muscle fibers supplied by the nerve.

3. Motor unit action potential (MUAP): potential recorded when an individual voluntarily contracts & activates a motor unit.

4. F-wave: late response received from a round trip from the stimulus site, to the spinal motor neuron & back to the muscle.

5. H-reflex: utilize a pathway similar to a muscle stretch reflex.

Reference(s)

Wilkinson, I., Furmedge, D. and Sinharay, R. (2017). Oxford handbook of clinical medicine. Oxford: Oxford University Press. Get it on Amazon.
Feather, A., Randall, D. and Waterhouse, M. (2020). Kumar And Clark’s Clinical Medicine. 10th ed. S.L.: Elsevier Health Sciences. Get it on Amazon.
Hannaman, R. A., Bullock, L., Hatchell, C. A., & Yoffe, M. (2016). Internal medicine review core curriculum, 2017-2018. CO Springs, CO: MedStudy.
Therapeutic Guidelines. Melbourne: Therapeutic Guidelines Limited. https://www.tg.org.au [Accessed 2021].