nerve conduction study (NCS); electroneuronography
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Indications
- peripheral neuropathy
- documenting the existence of a neuropathy
- quantitating its severity
- demonstrating the distribution of a neuropathy
- identifying conduction modality involved (i.e. sensory vs motor)
- provides clues as to underlying pathology (axonal vs. demyelinating)
- cranial nerve disease
- thoracic outlet syndrome
- neuromuscular disease
Procedure
- tests of peripheral nerves
- performed by stimulating a nerve at one point & measuring the action potential either at another point along the nerve (sensory conduction) or of the muscle innervated by the nerve (motor conduction)
- apparently hand-held device available[4]
Interpretation
- normal conduction velocity (adults)
- arms: 50-70 m/s
- legs: 40-60 m/s
- patterns
- demyelinating neuropathies
- slow conduction velocity
- prolonged distal latency
- axonal neuropathies
- reduced amplitude of motor or sensory nerve action potential
- demyelinating neuropathies
More general terms
More specific terms
Additional terms
References
- ↑ nlmpubs.nlm.nih.gov/hstat/ahcpr/
- ↑ Harrison's Principles of Internal Medicine, 13th ed. Companion Handbook, Isselbacher et al (eds), McGraw-Hill Inc. NY, 1995, pg 5-6
- ↑ Medical Knowledge Self Assessment Program (MKSAP) 11, 17. American College of Physicians, Philadelphia 1998, 2015
- ↑ 4.0 4.1 Young K, Sofair A, Chavey WE Carpal Tunnel Syndrome Guidelines Published Physician's First Watch, March 4, 2016 David G. Fairchild, MD, MPH, Editor-in-Chief Massachusetts Medical Society http://www.jwatch.org
Guideline on the Treatment of Carpal Tunnel Syndrome American Association of Orthopedic Surgeons (AAOS) http://www.aaos.org/Research/guidelines/CTStreatmentguide.asp